- Yellow supergiant
A yellow supergiant (YSG) is a
supergiantstar of spectral typeF or G. [p. 366, The evolution of massive stars with mass loss, Cesare Chiosi and Andre Maeder, "Annual review of astronomy and astrophysics" 24 (1986), pp. 329–375. bibcode|1986ARA&A..24..329C. doi|10.1146/annurev.aa.24.090186.001553.] These stars usually have masses between 15 and 20 solar masses. These stars, like any other supergiant,are older and swing between blue and red phases depending on the chemical elements they consume in their cores. Until now it had been thought that few supergiants spend long in the transitional yellow phase. These systems may be the progenitors of rare supernovae linked to yellow supergiants. Only two such supernovae have been detected - most supergiants go supernova when at the blue (or hot) phase or red (or cool) phase.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Blue supergiant — Blue supergiants (BSGs) are supergiant stars (luminosity class I) of spectral type O or B.They are extremely hot and bright, with surface temperatures of between 20,000 to 50,000°C. They typically have 10 to 50 solar masses on the Hertzsprung… … Wikipedia
B Velorum (supergiant) — Starbox short name=b Velorum epoch=J2000.0 constell=Vela ra=08h 40m 37.6s dec=−46° 38 56 spectral=F3Ia appmag v=+3.77 dist ly=3100 ± 1450 dist pc=950 ± 450 names=HR 3445, HD 74180, CD 46°4438, FK5 1226, HIP 42570, SAO 220265, GC 11951, CCDM 08406 … Wikipedia
Outline of astronomy — Mauna Kea in Hawaii is one of the world s premier observatory sites. Pictured is the W. M. Keck Observatory, an optical interferometer. The following outline is provided as an overview of and topical guide to astronomy: Astronomy – studies the… … Wikipedia
Variable star — A star is classified as variable if its apparent brightness as seen from Earth changes over time, whether the changes are due to variations in the star s actual luminosity, or to variations in the amount of the star s light that is blocked from… … Wikipedia
Delta Canis Majoris — d Canis Majoris δ CMa, a yellow supergiant 1800 lightyears away in the Canis Major constellation Observation data Epoch J2000 Equinox … Wikipedia
Holmberg IX — Infobox Galaxy name = Holmberg IX caption = Holmberg IX Dwarf Galaxy on DSS2, 9 prime; view credit = Palomar Observatory/STScI/WikiSky epoch = 2000 ra = RA|09|57|32.1 Cite web | title = SIMBAD: UGC 5336 | url = http://simbad3.u strasbg.fr/sim… … Wikipedia
Alpha Aquarii — NOTOC Starbox begin name = α AquariiStarbox image caption = α Aquarii Starbox observe epoch = J2000.0 equinox = J2000.0 (ICRS) constell = Aquarius ra = RA|22|05|47.0357SIMBAD link|alpha+aquarii|NAME SADALMELIK Star in double system, database… … Wikipedia
Ursa Minor — Infobox Constellation name =Ursa minor abbreviation = UMi genitive = Ursae Minoris symbology = The Little Bear RA = 15 dec= +75 areatotal = 256 arearank = 56th numbermainstars = 7 numberbfstars = 23 numberstarsplanets = 1 numberbrightstars = 2… … Wikipedia
R Coronae Borealis — Starbox begin name=R CrBStarbox image caption = R Coronae Borealis Starbox observe epoch=J2000 ra=RA|15|48|34.4149 dec=DEC|+28|09|24.296 appmag v=5.9 constell=Corona Borealis Starbox character class=G0Iab:pe b v=? u b=? variable=Variable Star of… … Wikipedia
Beta Aquarii — Starbox begin name=β Aquarii Starbox image caption = β Aquarii Starbox observe epoch=J2000 ra=21h 31m 33.5341s dec= 05° 34 prime; 16.22 Prime; appmag v=2.91 constell=Aquarius Starbox character class=G0Ib b v=0.83 u b=0.56 variable= Starbox… … Wikipedia