Y Carinae

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For y Carinae, see HD 83183.
Y Carinae
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 33m 10.85133s[1]
Declination −58° 29′ 55.0959″[1]
Apparent magnitude (V) 8.16[2] (7.53 - 8.48[3])
Spectral type F2 + B9.0V[4]
B−V color index +0.59[2]
Variable type Classical Cepheid[3]
Radial velocity (Rv) −12.90[5] km/s
Proper motion (μ) RA: −5.83[1] mas/yr
Dec.: 3.21[1] mas/yr
Parallax (π) 1.07 ± 1.10[1] mas
Absolute magnitude (MV) −3.0[6]
Mass 3.8[6] M
Luminosity 1,250[6] L
Surface gravity (log g) 1.800[2] cgs
Temperature 5,800[6] K
Metallicity −0.230[2]
Other designations
Y Carinae, Y Car, CD−57°3305, GSC 08613-01464, HD 91595, HIP 51653, 2MASS J10331084-5829550, SAO 238178
Database references

Y Carinae (Y Car) is a Classical Cepheid variable, a type of variable star, in the constellation Carina. Its apparent magnitude is 8.16. The variable primary star is in a triple system with a very close pair of hot main sequence stars. The Cepheid pulsation period is 3.6 days, which is very short for this type of star, leading to speculation that it formed by the merger of two stars similar to the pair it is in orbit with.[7] The period also displays a beat period due to the interference of the fundamental and first overtone pulsations.[6]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Soubiran, C.; Le Campion, J.-F.; Cayrel De Strobel, G.; Caillo, A. (2010). "The PASTEL catalogue of stellar parameters". Astronomy and Astrophysics 515: A111. Bibcode:2010A&A...515A.111S. doi:10.1051/0004-6361/201014247. 
  3. ^ a b 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. Bibcode:2009yCat....102025S. 
  4. ^ Zhou, A.-Y. (2010). "Pulsating Components in Binary and Multiple Stellar Systems --- A Catalog of Oscillating Binaries" 1002: arXiv:1002.2729. arXiv:1002.2729 [astro-ph.SR]. Bibcode:2010arXiv1002.2729Z. 
  5. ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics 424 (2): 727. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. 
  6. ^ a b c d e Bohm-Vitense, E.; Evans, N. R.; Carpenter, K.; Morgan, S.; Beck-Winchatz, B.; Robinson, R. (1997). "The dynamical mass of the beat cepheid Y carinae and stellar opacities". The Astronomical Journal 114: 1176. Bibcode:1997AJ....114.1176B. doi:10.1086/118549. 
  7. ^ Evans, Nancy Remage; Carpenter, Kenneth G.; Robinson, Richard; Kienzle, Francesco; Dekas, Anne E. (2005). "High-Mass Triple Systems: The Classical Cepheid Y Carinae". The Astronomical Journal 130 (2): 789. Bibcode:2005AJ....130..789E. doi:10.1086/430458.