HD 88366

Last updated
S Carinae
SCarLightCurve.png
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 [2]   mas
Distance 1,620 ± 70  ly
(500 ± 20  pc)
Absolute magnitude  (MV)−0.71 to −3.41 [7]
Details
Mass 0.6 [8]   M☉
Radius 120 [8]   R☉
Luminosity 2,200 [5]   L☉
Surface gravity (log g)−0.9 - 1.0 [9]   cgs
Temperature 3,050 - 3,590 [9]   K
Other designations
HR  3999, HD  88366, CP−60°1701, HIP  49751, SAO  250840, GC 13971
Database references
SIMBAD data

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] It is a pulsating star, with the temperature being highest at maximum visual brightness and lowest at the visual 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]

Related Research Articles

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Lambda Ursae Minoris is a star in the constellation Ursa Minor. It is an M-type red giant with an apparent magnitude of +6.38 and is approximately 880 light years from Earth.

21 Cancri is a double star in the northern zodiac constellation of Cancer. It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08. The star is located around 820 light years away from the Sun, based on parallax. It is moving further from the Earth with a heliocentric radial velocity of 35 km/s.

119 Tauri Star in the constellation Taurus

119 Tauri is a red supergiant star in the constellation Taurus. It is a semiregular variable and its angular diameter has been measured at about 10 mas.

R Centauri Variable star in the constellation Centaurus

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R Andromedae Star in the constellation Andromeda

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HD 36678 is single star in the northern constellation of Auriga. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.83. It is located at a distance of approximately 840 light years from the Sun based on parallax. This is an aging red giant star with a stellar classification of M0III. It is currently on the asymptotic giant branch of the HR diagram, and has expanded to ~63 times the radius of the Sun. The star is radiating ~875 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,950 K.

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W Hydrae Variable star in the constellation Hydra

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RT Carinae Star in the constellation Carina

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EV Carinae

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V528 Carinae Star in the constellation Carina

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BO Carinae Star in the constellation Carina

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64 Draconis Star in the constellation Draco

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R Fornacis Variable star in the constellation Fornax

R Fornacis is a Mira variable and carbon star located in the constellation Fornax. It is around 1,800 light years away based on parallax measurements.

References

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  3. 1 2 3 4 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. 1 2 Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  5. 1 2 3 Eggen, O. J. (1972). "Narrow-and broad-band photometry of red stars. VII. Luminosities and temperatures for halo-population red stars of high luminosity". The Astrophysical Journal. 172: 639. Bibcode:1972ApJ...172..639E. doi:10.1086/151383.
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  7. ↑ Celis, L. (1995). "Luminosity Attenuation and Distances of Red Giant Stars". The Astrophysical Journal Supplement Series. 98: 701. Bibcode:1995ApJS...98..701C. doi:10.1086/192175.
  8. 1 2 Willson, L. A.; Wallerstein, G.; Pilachowski, C. A. (1982). "Atmospheric kinematics of high velocity long period variables". Monthly Notices of the Royal Astronomical Society. 198 (2): 483–516. Bibcode:1982MNRAS.198..483W. doi: 10.1093/mnras/198.2.483 .
  9. 1 2 3 Shinkawa, Donna (1973). "The Mira Variable S Carinae". The Astrophysical Journal Supplement Series. 25: 253. Bibcode:1973ApJS...25..253S. doi:10.1086/190269.
  10. 1 2 Schultheis, M.; Glass, I. S. (2001). "Asymptotic giant branch variables in Baade's Windows". Monthly Notices of the Royal Astronomical Society. 327 (4): 1193–1200. Bibcode:2001MNRAS.327.1193S. doi: 10.1046/j.1365-8711.2001.04825.x .
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