Variable star | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Variable_star


00:00:49 1 Discovery
00:02:47 2 Detecting variability
00:03:16 2.1 Variable star observations
00:05:58 2.2 Interpretation of observations
00:07:41 3 Nomenclature
00:08:38 4 Classification
00:10:21 5 Intrinsic variable stars
00:10:36 5.1 Pulsating variable stars
00:12:35 5.1.1 Cepheids and cepheid-like variables
00:13:45 5.1.1.1 Classical Cepheid variables
00:14:25 5.1.1.2 Type II Cepheids
00:15:07 5.1.1.3 RR Lyrae variables
00:15:55 5.1.1.4 Delta Scuti variables
00:16:41 5.1.1.5 SX Phoenicis variables
00:17:09 5.1.1.6 Rapidly oscillating Ap variables
00:17:34 5.1.2 Long period variables
00:17:52 5.1.2.1 Mira variables
00:18:46 5.1.2.2 Semiregular variables
00:19:30 5.1.2.3 Slow irregular variables
00:19:52 5.1.2.4 Long secondary period variables
00:20:27 5.1.3 Beta Cephei variables
00:21:04 5.1.4 Slowly pulsating B-type stars
00:21:26 5.1.5 Very rapidly pulsating hot (subdwarf B) stars
00:22:01 5.1.6 PV Telescopii variables
00:22:31 5.1.7 RV Tauri variables
00:23:26 5.1.8 Alpha Cygni variables
00:24:06 5.1.9 Gamma Doradus variables
00:24:29 5.1.10 Pulsating white dwarfs
00:25:20 5.1.11 Solar-like oscillations
00:26:00 5.1.12 BLAP variables
00:26:22 5.2 Eruptive variable stars
00:26:49 5.2.1 Protostars
00:27:10 5.2.1.1 Herbig Ae/Be stars
00:27:29 5.2.1.2 Orion variables
00:28:01 5.2.1.3 FU Orionis variables
00:28:44 5.2.2 Giants and supergiants
00:29:04 5.2.2.1 Luminous blue variables
00:29:49 5.2.2.2 Yellow hypergiants
00:30:20 5.2.2.3 R Coronae Borealis variables
00:31:14 5.2.3 Wolf–Rayet variables
00:31:48 5.2.4 Gamma Cassiopeiae variables
00:32:17 5.2.5 Flare stars
00:32:57 5.2.6 RS Canum Venaticorum variables
00:33:27 5.3 Cataclysmic or explosive variable stars
00:33:38 5.3.1 Supernovae
00:35:37 5.3.2 Novae
00:36:32 5.3.3 Dwarf novae
00:37:38 5.3.4 DQ Herculis variables
00:38:27 5.3.5 AM Herculis variables
00:39:05 5.3.6 Z Andromedae variables
00:39:31 5.3.7 AM CVn variables
00:39:59 6 Extrinsic variable stars
00:40:17 6.1 Rotating variable stars
00:40:49 6.1.1 Non-spherical stars
00:40:58 6.1.1.1 Ellipsoidal variables
00:41:22 6.1.2 Stellar spots
00:41:48 6.1.2.1 FK Comae Berenices variables
00:42:29 6.1.2.2 BY Draconis variable stars
00:42:48 6.1.3 Magnetic fields
00:42:57 6.1.3.1 Alpha-2 Canum Venaticorum variables
00:43:25 6.1.3.2 SX Arietis variables
00:43:45 6.1.3.3 Optically variable pulsars
00:44:12 6.2 Eclipsing binaries
00:44:50 6.2.1 Algol variables
00:45:11 6.2.2 Double Periodic variables
00:45:34 6.2.3 Beta Lyrae variables
00:46:01 6.2.4 W Serpentis variables
00:46:31 6.2.5 W Ursae Majoris variables
00:46:52 6.3 Planetary transits
00:47:30 7 See also



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SUMMARY
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either:

Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks.
Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it.Many, possibly most, stars have at least some variation in luminosity: the energy output of our Sun, for example, varies by about 0.1% over an 11-year solar cycle.