T Carinae

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T Carinae
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Carina
Right ascension  10h 55m 17.22143s [1]
Declination −60° 31′ 01.1999″ [1]
Apparent magnitude  (V)5.93 [2]
Characteristics
Evolutionary stage Horizontal branch [3]
Spectral type K0III [4]
B−V color index +1.065±0.007 [2]
Variable type Constant [5]
Astrometry
Radial velocity (Rv)−25.5±2.9 [2]  km/s
Proper motion (μ)RA: −34.858 [1]   mas/yr
Dec.: +85.164 [1]   mas/yr
Parallax (π)11.4593 ± 0.0762 [1]   mas
Distance 285 ± 2  ly
(87.3 ± 0.6  pc)
Absolute magnitude  (MV)1.08 [2]
Details
Radius 9.25+0.21
−0.86 [1]   R☉
Luminosity 38.6±0.3 [1]   L☉
Temperature 4,729+237
−52 [1]   K
Other designations
T Car, CD−59°3419, CPD−59°2840, GC  15026, HD  94776, HIP  53394, HR  4271, SAO  251178 [6]
Database references
SIMBAD data

T Carinae is a star in the southern constellation of Carina. Although given a variable star designation, it is now thought to be constant; [5] the identifier HD 94776 from the Henry Draper catalogue may be used instead. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.93. [2] The distance to this object is approximately 285  light years based on parallax, [1] and it has an absolute magnitude of 1.08. [2] It is drifting closer to the Sun with a radial velocity of −26 km/s. [2]

This is an aging giant star with a stellar classification of K0III, [4] which indicates it has exhausted the supply of hydrogen at its core and expanded off the main sequence. It is a red clump giant, which means it is on the horizontal branch and is undergoing core helium fusion. [3] At present it has nine times the Sun's radius and is radiating 39 times the luminosity of the Sun from its photosphere at an effective temperature of 4,729 K. [1]

When used as a comparison star for AG Carinae in 1914 by H. E. Wood, [7] this object was announced as a candidate variable star. A year later it was determined by R. Innis that it was AG Carinae that varied and this star is constant. Later, T Carinae became flagged as a low amplitude irregular variable. [8] It is now catalogued as a probable constant star. [5]

Related Research Articles

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HD 92063 star in the constellation Carina

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V372 Carinae is a single star in the southern constellation of Carina. Located around 1300 light-years distant. It shines with a luminosity approximately 1742 times that of the Sun and has a surface temperature of 14132 K. It is a Beta Cephei variable.

CK Carinae is a variable star in the constellation Carina, the keel of Argo Navis. It is a member of the star association Carina OB1-D, at a distance of around 2,300 parsecs or 7,500 light years.

V528 Carinae

V528 Carinae is a variable star in the constellation Carina.

BO Carinae

BO Carinae, also known as HD 93420, is an irregular variable star in the constellation Carina.

IX Carinae is a red supergiant and pulsating variable star of spectral type M2Iab in the constellation Carina. It is a member of the Carina OB1 association along the Carina Nebula. It is one of the largest stars with a radius of 566 R☉. If placed at the center of the Solar System, it would extend close to the orbit of the outer Asteroid Belt Jupiter.

References

  1. 1 2 3 4 5 6 7 8 9 10 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.
  2. 1 2 3 4 5 6 7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID   119257644.
  3. 1 2 Laney, C. D.; et al. (January 2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637–1641, arXiv: 1109.4800 , Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x, S2CID   117788450.
  4. 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. 1 2 3 Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  6. ↑ "HD 94776". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-02-15.
  7. ↑ Wood, H. E. (June 1914), "Discovery of a variable star in Carina", Monthly Notices of the Royal Astronomical Society, 74 (8): 698, Bibcode:1914MNRAS..74..698W, doi: 10.1093/mnras/74.8.698 .
  8. ↑ Mayall, Margaret W. (August 1969), "Variable Star Notes", Journal of the Royal Astronomical Society of Canada, 63: 221, Bibcode:1969JRASC..63..221M.
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