bluuebunny/crossref_metadata_2025_split huggingface dataset:
Apsidal Motion and Absolute Parameters of 21 Early-type Small Magellanic Cloud Eccentric Eclipsing Binaries
Authors: Zasche P. , Wolf M. 
Published: February 2019

Abstract
We present the apsidal motion and light-curve analyses of 21 eccentric eclipsing binaries located in the Small Magellanic Cloud. Most of these systems have never been studied before, hence their orbital and physical properties as well as the apsidal motion parameters are given here for the first time. All the systems are of early spectral type, having orbital periods up to 4 days. The apsidal motion periods were derived to be from 7.2 to 200 yr (OGLE-SMC-ECL-2194 having the shortest apsidal period among known main-sequence systems). The orbital eccentricities are usually rather mild (median of about 0.06), the maximum eccentricity being 0.33. For the period analysis using O − C diagrams of eclipse timings, in total 951 minima were derived from survey photometry as well as our new data. Moreover, six systems show some additional variation in their O − C diagrams, which should indicate the presence of hidden additional components in them. According to our analysis these third-body variations have periods from 6.9 to 22 yr.
SN Ia Standardization on the Rise: Evidence for the Cosmological Importance of Pre-maximum Measurements
Authors: Hayden B. , Rubin D. , Strovink M. 
Published: February 2019

Abstract
We present SALT2X, an extension of the SALT2 model for SN Ia light curves. SALT2X separates the light-curve-shape parameter x
1 into an

and

for the rise and fall portions of the light curve. Using the Joint Lightcurve Analysis SN sample, we assess the importance of the rising and falling portions of the light curve for cosmological standardization using a modified version of the Unified Nonlinear Inference for Type Ia cosmologY (UNITY) framework. We find strong evidence that

has a stronger correlation with peak magnitude than

. We see evidence that standardizing on the rise affects the color standardization relation, and reduces the size of the host-galaxy standardization and the unexplained (“intrinsic”) luminosity dispersion. Since SNe Ia generally rise more quickly than they decline, a faster observing cadence in future surveys will be necessary to maximize the gain from this work and to continue to explore the impacts of decoupling the rising and falling portions of SN Ia light curves.
A Hint of Three-section Halo As Seen from the APOGEE DR14
Authors: Chen Y. Q. , Zhao G. , Xue X. X. , Zhao J. K. , Liang X. L. , Jia Y. P. , Yang C. Q. 
Published: February 2019

Abstract
Based on the [M/H] versus [Mg/Fe] diagram and distances from APOGEE data release 14, we compare the spatial distributions, the l − V
los diagram, and the abundance gradients between high-[Mg/Fe] and low-[Mg/Fe] sequences. The two sequences are clearly shown at

in the metallicity range of −1.6 < [M/H] < −0.7, where the halo at

consists of low-[Mg/Fe] stars only. In the intermediate-metallicity range of −1.1 < [M/H] < −0.7, a [Mg/Fe] gradient is detected for stars at

and it flattens out at

. The l − V
los diagram is adopted to separate halo stars from the disk by defining the transition metallicity, which is of [M/H] ∼ −1.1 ± 0.05 dex for the high-[Mg/Fe] sequence and of [M/H] ∼ −0.7 ± 0.05 dex for the low-[Mg/Fe] sequence. The R and

distributions for the high-[Mg/Fe] sequence, the thick disk at −1.1 < [M/H] < −0.7 and the in situ halo at −1.6 < [M/H] < −1.1, have a cutoff at R ∼ 15 kpc and

, beyond which low-[Mg/Fe] halo stars are the main contributions. In the metallicity range of −1.6 < [M/H] < −0.7, there is a negative metallicity gradient for the high-[Mg/Fe] halo at

, while only a marginal or no slope in the [M/H] versus

diagram for the low-[Mg/Fe] halo at

, beyond which both the high-[Mg/Fe] halo and low-[Mg/Fe] halo flatten out toward

. These results indicate a complicated formation history of the Galaxy and we may see a hint of a three-section halo, i.e., the inner in situ halo within

, the intermediately outer dual-mode halo at

, and the extremely outer accreted halo with

.
Constraining the Magnetic Field of the Smith High-velocity Cloud Using Faraday Rotation
Authors: Betti S. K. , Hill Alex S. , Mao S. A. , Gaensler B. M. , Lockman Felix J. , McClure-Griffiths N. M. , Benjamin Robert A. 
Published: February 2019

Abstract
The Smith Cloud is a high-velocity cloud with an orbit suggesting it has made at least one passage through the Milky Way disk. A magnetic field found around this cloud has been thought to provide extra stability as it passes through the Galactic halo. We use the Karl G. Jansky Very Large Array to measure Faraday rotation measures (RMs) toward 1105 extragalactic background point sources behind and next to the Smith Cloud to constrain the detailed geometry and strength of its magnetic field. The RM pattern across the cloud gives the detailed morphology of the magnetic field structure, which indicates a field draped over the ionized gas and compressed at the head of the cloud. We constrain the peak line-of-sight magnetic field strength to ≳+5 μG and create a model of the magnetic field to demonstrate that a draped configuration can qualitatively explain the morphology of the observed RMs.
Comprehensive Analysis of the Formation of a Shock Wave Associated with a Coronal Mass Ejection
Authors: Frassati Federica , Susino Roberto , Mancuso Salvatore , Bemporad Alessandro 
Published: February 2019

Abstract
On 2014 November 1, a solar prominence eruption associated with a C2.7 class flare and a type II radio burst resulted in a fast partial halo coronal mass ejection (CME). Images acquired in the extreme ultraviolet (EUV) by the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA) and PROBA2/SWAP and in white light (WL) by Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph show the expansion of a bright compression front ahead of the CME. In this work, we present a detailed investigation of the CME-driven shock associated with this event following the early evolution of the compression front observed near the Sun up to the extended corona. Our aim is to shed light on the long-debated issue concerning the location and timing of shock formation in the corona. Through differential emission measure analysis, we derived, for the first time, the compression ratio across the expanding EUV front observed by AIA at different temperature ranges: higher compression ratios corresponded to higher plasma temperature ranges, as expected. Moreover, comparison between up- and downstream temperatures and those expected via adiabatic compression shows that no additional heating mechanisms occurred in the early front expansion phase, implying that the shock formed beyond the AIA field of view. Finally, the analysis of the associated type II radio burst, in combination with the inferred coronal density distribution, allowed us to identify a well-defined region located northward of the CME source region as the site for shock formation and to outline its kinematics in accordance with the evolution of the expanding front as obtained from the EUV and WL data.
Detection of a Gamma-Ray Flare from the High-redshift Blazar DA 193
Authors: Paliya Vaidehi S. , Ajello M. , Ojha R. , Angioni R. , Cheung C. C. , Tanada K. , Pursimo T. , Galindo P. , Losada I. R. , Siltala L. , Djupvik A. A. , Marcotulli L. , Hartmann D. 
Published: February 2019

Abstract
High-redshift (z > 2) blazars are the most powerful members of the blazar family. Yet, only a handful of them have both X-ray and γ-ray detection, thereby making it difficult to characterize the energetics of the most luminous jets. Here, we report, for the first time, the Fermi-Large Area Telescope detection of the significant γ-ray emission from the high-redshift blazar DA 193 (z = 2.363). Its time-averaged γ-ray spectrum is soft (γ-ray photon index = 2.9 ± 0.1), and together with a relatively flat hard X-ray spectrum (14–195 keV photon index = 1.5 ± 0.4), DA 193 presents a case to study a typical high-redshift blazar with inverse Compton peak being located at MeV energies. An intense GeV flare was observed from this object in the first week of 2018 January, a phenomenon rarely observed from high-redshift sources. What makes this event a rare one is the observation of an extremely hard γ-ray spectrum (photon index = 1.7 ± 0.2), which is somewhat unexpected because high-redshift blazars typically exhibit a steep falling spectrum at GeV energies. The results of our multifrequency campaign, including both space- (Fermi, NuSTAR, and Swift) and ground-based (Steward and Nordic Optical Telescope) observatories are presented, and this peculiar γ-ray flare is studied within the framework of a single-zone leptonic emission scenario.
Flare and Warp of Galactic Disk with OB Stars from Gaia DR2
Authors: Li Chengdong , Zhao Gang , Jia Yunpeng , Liao Shilong , Yang Chengqun , Wang Qixun 
Published: February 2019

Abstract
The OB stars are selected from the Gaia DR2 catalog to explore the flare and warp of the Galactic disk in this work. The Gaia and 2MASS photometric information is adopted as the criteria to choose the sample stars. We model the Galactic disk stellar distribution in this work taking the flare and warp into consideration. The parameters in the flare and warp model are acquired directly by fitting the stars with the stellar distribution function of the disk. We obtain that the scale length of the Galactic disk in space density is 2.10 ± 0.01 kpc. We find that the disk scale height increases with Galactic radius via fitting our sample stars perpendicular to the Galactic plane. The scale height of OB stars increases more moderately than old stellar populations in the disk. It is also concluded that the inner disk is flat and begins to warp at about 9 kpc away from Galactic center. The warp amplitude of OB stars is similar to pulsars and slowly increases along the Galactic radius.
Line-of-Sight Gas Sloshing in the Cool Core of Abell 907
Authors: Ueda Shutaro , Ichinohe Yuto , Kitayama Tetsu , Umetsu Keiichi 
Published: February 2019

Abstract
We present line-of-sight (LOS) gas sloshing first found in a cool core in a galaxy cluster. The galaxy cluster Abell 907 is identified as a relaxed cluster owing to its global X-ray surface brightness taken by the Chandra X-ray Observatory. The X-ray residual image after removing the global emission of the intracluster medium (ICM), however, shows an arc-like positive excess and a negative excess surrounding the central positive excess in the cluster core, which in turn indicates a disturbance of the ICM. We analyze the X-ray spectra extracted from both regions and find that (1) the ICM temperature and the metal abundance in the positive excess are lower and higher than those in the negative excess, respectively, and (2) the ICM is nearly in pressure equilibrium. We also find a slight redshift difference between the positive and the negative excesses, which corresponds to the velocity shear of

km s−1 (1σ). The X-ray residual image and the ICM properties are consistent with those expected by LOS gas sloshing. Assuming that the gas is moving inverse-parallel to each other along the LOS, the shear velocity is expected to be ∼800 km s−1. The velocity field of this level is able to provide nonthermal pressure support by ∼34% relative to the thermal one. The total kinetic energy inferred from the shear velocity corresponds to ∼30% of the bolometric luminosity of the sloshing ICM. Abell 907 is therefore complementary to galaxy clusters in which gas sloshing takes place in the plane of the sky, and is important for understanding gas dynamics driven by sloshing and its influence on the heating to prevent runaway cooling.
Alfvénicity of Quiet-Sun-associated Wind during Solar Maximum
Authors: Wang Xin , Zhao Liang , Tu Chuanyi , He Jiansen 
Published: February 2019

Abstract
The quiet Sun (QS) and helmet streamer (STR) are generally considered to account for sources of slow solar wind with low Alfvénicity and low proton temperature. The solar wind with high Alfvénicity is often associated with coronal holes (CHs). Recently, the solar wind measured by the Advanced Composition Explorer spacecraft at 1 au was mapped back to its magnetic footpoints. Depending on the proximity of the solar wind footpoints to a given coronal or heliospheric structure, we classify solar winds into different types based on their sources: QS, STR, active region (AR), and CH. Here, we compare the properties of the solar winds originated from QS, STR, AR, and CH using 2 hr data. We find that at solar maximum 34% of the quiet-Sun-associated slow wind (V
SW < 450 km s−1) has high Alfvénicity (

). This significantly higher proportion of Alfvénic fluctuations indicates that the quiet-Sun-associated wind at 1 au has similar properties as fast wind, which originates from the CH. Accordingly, we speculate that this type of solar wind at 1 au could come from open fields within the quiet-Sun region. This observational study will help us understand more about the coronal source regions of the solar wind in interplanetary space.
Frequent Flare Events on the Short-period M-type Eclipsing Binary BX Tri
Authors: Luo ChangQing , Zhang XiaoBin , Wang Kun , Liu Chao , Fang Xiangsong , Zhang Chunguang , Deng Licai , Nie Jundan , Fox-Machado Lester , Luo Yangping , Niu Hubiao 
Published: February 2019

Abstract
We present long-term, multicolor photometric monitoring and spectroscopic observations of the short-period M-type eclipsing binary BX Tri. Six flare events were recorded over four years from 2014 to 2017. Three of them were detected on one night within an orbital cycle. The strongest one was identified on 2014 December 23. With the amplitudes ΔB = 0.48 mag, ΔV = 0.28 mag, ΔR = 0.10 mag, and ΔI = 0.02 mag, the total energy due to the flare event was measured to be 4.08 (±0.24) × 1034 erg, exceeding the superflare level (1034). Based on the observations, the evolutionary status of the binary system and the long-term orbital period changes were analyzed. It reveals that BX Tri is probably a semidetached system with the primary component filling its Roche lobe. The extremely high occurrence of flare events in the binary could be related to rapid mass transfer between the components.
Line Identification of Atomic and Ionic Spectra of Holmium in the Visible Spectral Range. I. Spectrum of Ho i
Authors: Özdalgiç B. , Güzelçİmen F. , Öztürk I. K. , Kröger S. , Kruzins A. , Tamanis M. , Ferber R. , Başar Gö. 
Published: February 2019

Abstract
Spectra of a holmium hollow cathode discharge lamp with neon or argon as buffer gases have been measured with a Fourier Transform spectrometer. In the visible spectral range from 14,280 up to 25,000 cm−1, or 400 to 700 nm, more than 4000 spectral lines were detected. Based on different signal-to-noise ratios in two spectra measured with different discharge conditions, we could distinguish between different elements and between different degrees of ionization of Ho. Altogether 2862 lines could be assigned to atomic Ho, 2417 of which had not been listed in literature up to now. Based on the known energy levels of atomic holmium, 987 lines have been classified, 627 of which have been classified for the first time.
Line Identification of Atomic and Ionic Spectra of Holmium in the Visible Spectral Range. II. Spectrum of Ho ii and Ho iii
Authors: Özdalgiç B. , Başar Gö. , Güzelçimen F. , Öztürk I. K. , Ak T. , Bilir S. , Tamanis M. , Ferber R. , Kröger S. 
Published: February 2019

Abstract
Fourier Transform spectra of Holmium (Ho) in the visible spectral range from 14,280 up to 25,000 cm−1, or 400 to 700 nm have been investigated, with a focus on the ionic lines. More than 500 spectral lines were assigned to singly ionized Ho (Ho ii), of which more than 400 were previously unknown. A further 21 lines were assigned to doubly ionized Ho (Ho iii), 1 of which was not reported previously. From among these lines, 60 Ho ii lines and 20 Ho iii lines were classified. A complete list of more than 4000 Ho lines observed in the recorded spectrum is supplied, even if they remain unclassified.
Atherosclerotic Vascular Events in Systemic Lupus Erythematosus: An Evolving Story
Authors: Urowitz Murray B. , Su Jiandong , Gladman Dafna D. 
Published: February 2019

Objective.Atherosclerotic vascular events (AVE) are a major cause of mortality and morbidity in systemic lupus erythematosus (SLE). We aimed to determine the effect of early recognition and therapy for both classic risk factors for AVE and for SLE, on the burden of AVE in SLE in recent decades.Methods.Inception patients who entered the University of Toronto Lupus Clinic between 1975 and 1987 followed to 1992 (Cohort 1), and between 1999 and 2011 followed to 2016 (Cohort 2) were studied. AVE attributed to atherosclerosis and occurring during the 17 years were identified. SLE disease activity and therapy as well as hypertension, hypercholesterolemia, hyperglycemia, and smoking were assessed. Analysis included descriptive statistics on baseline characteristics, traditional risk factors over the followup, outcome rates by each 100 person-years (PY), Kaplan-Meier cumulative AVE curves, as well as competing risk Cox models adjusted by inverse probability weights.Results.Of the 234 patients in Cohort 1, 26 patients (11%) had an AVE compared with 10 of 262 patients (3.8%) in Cohort 2. The rate per 100 PY of followup was 1.8 in Cohort 1 and 0.44 in Cohort 2 (p < 0.0001). Better control of all risk factors and disease activity was achieved in Cohort 2. There was a reduction of 60% in the risk for AVE in Cohort 2.Conclusion.The incidence of AVE in SLE in the modern era has declined in large part owing to more effective management of classic coronary artery risk factors and of SLE.
OMERACT Development of a Core Domain Set of Outcomes for Shared Decision-making Interventions
Authors: Toupin-April Karine , Barton Jennifer L. , Fraenkel Liana , Meara Alexa , Li Linda C. , Brooks Peter , de Wit Maarten , Stacey Dawn , Légaré France , Shea Beverley , Lyddiatt Anne , Hofstetter Cathie , Christensen Robin , Scholte Voshaar Marieke , Suarez-Almazor Maria E. , Boonen Annelies , Meade Tanya , March Lyn , Jull Janet Elizabeth , Campbell Willemina , Alten Rieke , Karuranga Suvi , Morgan Esi M. , Kelly Ayano , Kaufman Jessica , Hill Sophie , Maxwell Lara J. , Beaton Dorcas , El-Miedany Yasser , Mittoo Shikha , Bartlett Susan J. , Singh Jasvinder A. , Tugwell Peter S. 
Published: February 2019

Objective.The Outcome Measures in Rheumatology (OMERACT) Shared Decision Making (SDM) Working Group aims to determine the core outcome domain set for measuring the effectiveness of SDM interventions in rheumatology trials.Methods.A white paper was developed to clarify the draft core domain set. It was then used to prepare for interviews to investigate reasons for lack of consensus on it and to suggest further improvements.Results.OMERACT scientists/clinicians (n = 13) and patients (n = 10) suggested limiting the core domain set to outcome domains, removing process domains, and clarifying remaining domains.Conclusion.A revised core domain set will undergo further consensus-building.
Filt : tisser les fils de l’exportation
Authors: Cousin Catherine , Cousin Jean-Philippe 
Published: February 2019

Le tsunami, qui a provoqué la perte des 30 % de ventes que représentait pour elle le Japon, n’a pas coulé Filt. L’entreprise a rebondi en poursuivant l’exportation, en diversifiant ses marchés et en renouant avec un savoir-faire perdu pour faire du filet à provisions un produit tendance au succès mondial.
Inventer ensemble notre futur numérique : une ardente obligation !
Authors: Curien Nicolas 
Published: February 2019

Le phénomène des données massives ( big data ) a modifié en profondeur la nature du rapport entre expertise et décision. Dans le domaine du marketing, notamment, des cycles courts de programmation permettent l’activation de boucles adaptatives, l’action répondant en temps quasi-réel à la mesure. L’étape intermédiaire de la prévision est ainsi « économisée », l’algorithme transposant directement l’observation en stratégie. Cette caractéristique majeure de l’analyse moderne des données, déjà présente dans le courant de pensée français de la « prospective », dénote un glissement depuis l’attitude consistant à prédire le futur vers celle consistant à le forger, un changement de perspective qui nous invite à revisiter le dilemme entre déterminisme et libre arbitre. À cet égard, le très suggestif paradoxe de Newcomb constitue une base théorique utile à comprendre la mutation de la démarche prévisionniste en démarche « pré-visionnaire », dans le contexte actuel d’une invention collective de la société et de l’économie numériques.
Enfants confiés aux proches : comparaison France - Italie
Authors: Tillard Bernadette , Sità Chiara , Cadei Livia , Mosca Sarah 
Published: February 2019

L’implication de la famille élargie et du réseau social des familles est un objet peu exploré en France comme en Italie. Cet article se focalise sur cette forme de suppléance familiale dans chacun de ces deux pays. Après avoir présenté les définitions de ces recours au placement dans la famille ou l’entourage en France et en Italie, les auteures mobilisent les connaissances statistiques et les rapports qui y sont publiés. Elles abordent les questions que posent ces sollicitations de l’entourage aux travailleurs sociaux. Une grande diversité des formes de recours en Italie contraste avec les statuts français plus figés de Tiers Digne de Confiance et du tout récent « accueil durable et bénévole ».
Comparer les droites extrêmes
Authors: Froio Caterina 
Published: February 2019

Les années 1980 marquent le début de « la troisième vague » des études sur les partis de droite radicale (PDR) qui ont émergé dans l’après-guerre en Europe. À partir de cette période, la littérature a consacré plus de publications à ces partis qu’à toutes les autres familles politiques. Sans prétendre à l’exhaustivité, l’article a pour objectif de proposer un état de l’art des travaux de facture comparative sur ce thème, structuré autour de trois questions : quelles sont les principales problématiques soulevées ? Quels cas d’études, données et méthodes d’enquête sont mobilisés ? Quelles recherches futures sont souhaitables dans un domaine d’étude déjà si riche ? Pour les aborder, l’article parcourt les évolutions réalisées dans les travaux comparatifs récents en langue française et anglaise sur les partis de la droite radicale. Je montre que les chercheurs ont commencé à s’intéresser à des problématiques et des cas plus variés que par le passé. Cependant à partir des années 1990 l’innovation théorique et méthodologique reste assez modeste, notamment lorsqu’il s’agit d’expliquer leur soutien électoral. En outre, les études qui s’intéressent à l’« impact » des droites radicales restent focalisées sur des domaines tels que ceux de l’immigration et de l’intégration européenne. Cet état des lieux souligne, d’une part, le besoin d’une recherche comparative novatrice qui reconnaisse plus explicitement la variété dans le champ des droites extrêmes et qui interroge critiquement l’usage du mot « populisme » ; d’autre part, la nécessité de travaux qui dépassent le paradigme du parti « outsider » pour la droite radicale afin d’en saisir les évolutions.