行星状星云
參考資料

↑  Miszalski et al. 2011
1 2 3  Frankowski & Soker 2009，第654–8頁
↑  SEDS 2013
↑  Hubblesite.org 1997
↑  Frew & Parker 2010，第129–148頁
1 2 3 4 5 6 7 8 9  Kwok 2000，第1–7頁
1 2 3  Moore 2007，第279–80頁
↑  Malin, David, , Cambridge, Massachusetts: Sky Publishing Corporation: 168, 1993, ISBN 0876541015
↑  Huggins & Miller 1864，第437–44頁
↑  Bowen 1927，第295–7頁
↑  Gurzadyan 1997
↑  .   [21 December 2015]. （原始内容存档于2019-04-04）.
1 2 3 4 5 6 7 8  Kwok 2005，第271–8頁
↑  Hora et al. 2004，第296–301頁
↑  Kwok et al. 2006，第445–6頁
1 2  Reed et al. 1999，第2430–41頁
↑  Aller & Hyung 2003，第15頁
↑  Krause 1961，第187頁
↑  Maciel, Costa & Idiart 2009，第127–37頁
↑  Harpaz 1994，第55–80頁
1 2 3  Harpaz 1994，第99–112頁
↑  . Picture of the Week. ESA/Hubble.   [18 August 2011]. （原始内容存档于2020-07-01）.
↑  W. Sutherland.  (PDF). 26 March 2013  [13 January 2015]. （原始内容 (PDF)存档于2020-01-26）.
↑  Sackmann, I. -J.; Boothroyd, A. I.; Kraemer, K. E. . The Astrophysical Journal. 1993, 418: 457. Bibcode:1993ApJ...418..457S. doi:10.1086/173407.
↑  Castor, J.; McCray, R.; Weaver, R. . Astrophysical Journal Letters. 1975, 200: L107–L110. Bibcode:1975ApJ...200L.107C. doi:10.1086/181908.
↑  Kwok 2000，第199–207頁
↑  Pan, Liubin; Scannapieco, Evan; Scalo, Jon. . The Astrophysical Journal. 1 October 2013, 775 (2): 111. Bibcode:2013ApJ...775..111P. arXiv:1306.4663 . doi:10.1088/0004-637X/775/2/111.
↑  Marochnik, Shukurov & Yastrzhembsky 1996，第6–10頁
↑  Gregory, Stephen A.; Michael Zeilik.  4. Fort Worth [u.a.]: Saunders College Publ. 1998: 322. ISBN 0-03-006228-4.
1 2  Osterbrock & Ferland 2005，第10頁
↑  Gurzadyan 1997，第238頁
↑  Gurzadyan 1997，第130–7頁
1 2  Osterbrock & Ferland 2005，第261–2頁
↑  Osterbrock & Ferland 2005，第207頁
↑  Parker et al. 2006，第79–94頁
1 2 3  Majaess, Turner & Lane 2007，第1349–60頁
↑  Jacoby, Ferland & Korista 2001，第272–86頁
↑  Kwok & Su 2005，第L49–52頁
1 2 3  Kwok 2000，第89–96頁
↑  Rees & Zijlstra 2013
↑  Morris 1990，第526–30頁
↑  SpaceDaily Express 2005
1 2  Jordan, Werner & O'Toole 2005，第273–9頁
↑  Jacoby, George H.; Ciardullo, Robin; De Marco, Orsola; Lee, Myung Gyoon; Herrmann, Kimberly A.; Hwang, Ho Seong; Kaplan, Evan; Davies, James E., (2013). A Survey for Planetary Nebulae in M31 Globular Clusters Archive.is的存檔，存档日期2015-09-24, ApJ, 769, 1
↑  Frew, David J. (2008). Planetary Nebulae in the Solar Neighbourhood: Statistics, Distance Scale and Luminosity Function, PhD Thesis, Department of Physics, Macquarie University, Sydney, Australia
↑  Parker 2011，第1835–1844頁
↑  Majaess, D.; Carraro, G.; Moni Bidin, C.; Bonatto, C.; Turner, D.; Moyano, M.; Berdnikov, L.; Giorgi, E., (2014). On the crucial cluster Andrews-Lindsay 1 and a 4% distance solution for its planetary nebula Archive.is的存檔，存档日期2015-09-24, A&A, 567
↑  Kiss et al. 2008，第399–404頁
↑  Mermilliod et al. 2001，第30–9頁
↑  Bonatto, C.; Bica, E.; Santos, J. F. C., (2008). Discovery of an open cluster with a possible physical association with a planetary nebula, MNRAS, 386, 1
↑  Turner, D. G.; Rosvick, J. M.; Balam, D. D.; Henden, A. A.; Majaess, D. J.; Lane, D. J. (2011). New Results for the Open Cluster Bica 6 and Its Associated Planetary Nebula Abell 8, PASP, 123, 909
↑  Moni Bidin, C.; Majaess, D.; Bonatto, C.; Mauro, F.; Turner, D.; Geisler, D.; Chené, A.-N.; Gormaz-Matamala, A. C.; Borissova, J.; Kurtev, R. G.; Minniti, D.; Carraro, G.; Gieren, W. (2014). Investigating potential planetary nebula/cluster pairs Archive.is的存檔，存档日期2015-09-24, A&A, 561
↑  Allison 2006，第56–8頁
↑  . ESO Press Release.   [13 February 2013]. （原始内容存档于2021-04-04）.
↑  R. Gathier.  (PDF). ESO Messenger.   [31 May 2014]. （原始内容存档 (PDF)于2012-01-05）.
↑  Soker 2002，第481–6頁
↑  Gurzadyan 1997，第424頁
↑  Liu et al. 2000，第585–587頁