HD 88366

This article is about the Mira variable S Carinae. For s Carinae, see HD 90853.
S Carinae

The visual band light curve of S Carinae, from AAVSO data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 09m 21.894s[2]
Declination −61° 32′ 56.43″[2]
Apparent magnitude (V) 4.5 - 10.0[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type K5e - M6e[3]
U−B color index +0.93 to +1.93[5]
B−V color index +1.43 to +2.60[5]
Variable type Mira[3]
Astrometry
Radial velocity (Rv)289.30[6] km/s
Proper motion (μ) RA: −94.237[2] mas/yr
Dec.: 76.811[2] mas/yr
Parallax (π)2.0110 ± 0.0855 mas[2]
Distance1,620 ± 70 ly
(500 ± 20 pc)
Absolute magnitude (MV)−0.71 to −3.41[7]
Details
Mass0.6[8] M☉
Radius120[8] R☉
Luminosity2,200[5] L☉
Surface gravity (log g)−0.9 - 1.0[9] cgs
Temperature3,050 - 3,590[9] K
Other designations
HR 3999, HD 88366, CP−60°1701, HIP 49751, SAO 250840, GC 13971
Database references
SIMBADdata

S Carinae (HD 88366) is a variable star in the constellation Carina.

S Carinae is an M-type red giant with a mean apparent magnitude of +6.94. It is approximately 1,620 light years from Earth. It is classified as a Mira type variable star and its brightness varies between magnitude +4.5 and +10.0 with a period of 149.49 days.[3] It has one of the earliest spectral types, and hence the hottest temperatures, of any Mira variable, and has a relatively short period for the class.[10] The temperature of this pulsing star is highest at visual brightness maximum and lowest at visual brightness minimum.[9]

S Carinae has exhausted its core hydrogen and expanded to become a red giant. It has also exhausted its core helium and evolved to the asymptotic giant branch, where it fuses hydrogen and helium in separate shells outside the core.[10][4]

  1. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference dr2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference eggen1992 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference eggen1972 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference pulkovo was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference celis1995 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference willson1982 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference shinkawa1973 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference schultheis2001 was invoked but never defined (see the help page).