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  mas [1]
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

HD 94510 is a single star in the southern constellation of Carina, positioned near the northern constellation border with Vela. It has the Bayer designation u Carinae; HD 94520 is the identifier from the Henry Draper Catalogue. This object has an orange hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around +3.78. The star is located at a distance of 95 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +8 km/s.

HD 90853 is a single star in the southern constellation Carina. It has the Bayer designation s Carinae, while HD 98053 is the identifier from the Henry Draper catalogue. This is a variable star with an apparent visual magnitude that ranges from 3.36 down to 3.51, and thus is bright enough to be visible to the naked eye. It is located at a distance of approximately 1,340 light-years from the Sun based on parallax, and has an absolute magnitude of −4.44. The star is drifting further away with a radial velocity of +9 km/s.

HD 76728 is a suspected astrometric binary star system in the constellation Carina. It has the Bayer designation c Carinae; HD 76728 is the identifier from the Henry Draper catalogue. The visible component has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.84. The system is located at a distance of approximately 320 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of around +25 km/s. It is a candidate member of the Volans-Carina Association of co-moving stars.

HD 83095 is a single star in the southern constellation of Carina. It has the Bayer designation H Carinae; HD 83095 is the identifier from the Henry Draper Catalogue. This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.46. The star is located at a distance of approximately 710 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +14 km/s. It has an absolute magnitude of −1.45.

<span class="mw-page-title-main">V343 Carinae</span> Star in the constellation Carina

V343 Carinae is a blue-white star or star system in the southern constellation of Carina. It has the Bayer designation d Carinae, while V343 Carinae is a variable star designation. The star is visible to the naked eye with an apparent visual magnitude of 4.31. The distance to this object is approximately 1,440 light years based on parallax. It is drifting further away with a radial velocity of +13 km/s.

HD 80230 is a single star in the southern constellation of Carina, near the northern constellation border with Vela. It has the Bayer designation g Carinae, while HD 80230 is the star's identifier in the Henry Draper catalogue. This is a suspected variable star with a brightness that has been measured varying from magnitude 4.31 down to 4.35, both of which is bright enough for the star to be visible to the naked eye. The distance to this object is approximately 490 light years based on parallax, but it is drifting closer to the Sun with a radial velocity of −5 km/s.

HD 91942 is a single variable star in the constellation Carina. It has the Bayer designation r Carinae, while HD 91942 is the identifier from the Henry Draper catalogue. This orange-hued object is visible to the naked eye with an apparent visual magnitude of 4.45. Based on parallax measurements, it is located at a distance of approximately 1,180 light years from the Sun. The star has an absolute magnitude of −3.77, and is drifting further away with a radial velocity of +9.9 km/s.

<span class="mw-page-title-main">R Carinae</span> Variable star in the constellation Carina

R Carinae is a double star in the southern constellation of Carina. The brighter component is a variable star that can be viewed with the naked eye at peak brightness, but is usually too faint to be seen without a telescope, having an apparent visual magnitude that fluctuates around 7.43. This star is located at a distance of approximately 1,300 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +28 km/s.

<span class="mw-page-title-main">V344 Carinae</span> Star in the constellation Carina

V344 Carinae is a single star in the southern constellation of Carina. It has the Bayer designation f Carinae, while V344 Carinae is its variable star designation. This star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around 4.50. Historically, it was mentioned in the Almagest, suggesting that some time around 130 BCE it was brighter than its current magnitude. This object is located at a distance of approximately 610 light-years from the Sun based on parallax. The star is drifting further away with a radial velocity of around +27 km/s.

HD 83944 is a star system in the constellation Carina. This has the Bayer designation m Carinae, while HD 83944 is the identifier from the Henry Draper catalogue. It is a suspected variable with an apparent visual magnitude that fluctuates around 4.51 with an amplitude of 0.5. The system is located at a distance of approximately 226 light years from the Sun based on parallax, and it has an absolute magnitude of 0.31. It is a member of the Carina association of co-moving stars.

<span class="mw-page-title-main">V520 Carinae</span> Star in the constellation Carina

V520 Carinae is a single star in the southern constellation of Carina. It has the Bayer designation w Carinae, while V520 Carinae is a variable star designation. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.58. It is located at a distance of approximately 1,140 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +9 km/s. It is a candidate member of the IC 2391 moving group of co-moving stars.

<span class="mw-page-title-main">V533 Carinae</span> Star in the constellation Carina

V533 Carinae is a A-type supergiant and a Alpha Cygni variable star with a mean apparent magnitude of +4.59 in the constellation Carina. It is located at a distance of about 13,000 light years.

<span class="mw-page-title-main">V345 Carinae</span> Star in the constellation Carina

V345 Carinae is a star in the constellation Carina. It has the Bayer designation E Carinae; V345 Carinae is the variable star designation. The star has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.66. Its actual brightness varies from magnitude +4.67 to +4.78 with a period of 137.7 days. Based on parallax measurements, it is located at a distance of approximately 1,010 light years from the Sun. It is drifting further away with a radial velocity of around +19 km/s.

HD 73389 is a binary star system in the constellation Carina. It has the Bayer designation e2 Carinae; HD 73389 is the identifier from the Henry Draper Catalogue. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of +4.84. Based on parallax measurements, it is located at a distance of approximately 225 light years from the Sun. The system is drifting further away with a radial velocity of +25.6 km/s.

HD 73390, also called e1 Carinae, is a binary star system in the constellation Carina. It is approximately 870 light years from Earth. The primary is a blue-white B-type main sequence dwarf with an apparent magnitude of +5.27. It displays an infrared excess and is a candidate host of an orbiting debris disk. The secondary is a magnitude 8.9 star which has a mass and temperature similar to the Sun.

<span class="mw-page-title-main">HD 92063</span> Star in the constellation Carina

HD 92063 is a single star in the southern constellation of Carina. It has the Bayer designation t1 Carinae, while HD 92063 is the star's identifier from the Henry Draper Catalogue. This is a suspected variable star and is visible to the naked eye with an apparent visual magnitude of 5.08. The star is located at a distance of approximately 246 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −10 km/s. Although it appears at the edge of the Carina Nebula, it is much closer than the nebula. It is also not considered a member of the nearby Alessi 5 open cluster of stars.

<span class="mw-page-title-main">V376 Carinae</span> Star in the constellation Carina

V376 Carinae is a binary star system in the southern constellation of Carina. It has the Bayer designation b1 Carinae; V376 Carinae is the variable star designation. The system is visible to the naked eye as a faint point of light with a combined apparent magnitude of +4.69. The distance to this system from the Sun is approximately 650 light years based on parallax. It is drifting further away with a radial velocity of +27 km/s.

<span class="mw-page-title-main">V448 Carinae</span> Star in the constellation Carina

V448 Carinae is a single star in the constellation Carina. It has the Bayer designation O Carinae, while V448 Carinae is the variable star designation. This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.60. It is located at a distance of approximately 680 light years from the Sun based on parallax, and is drifting further away with a radial velocity of around +26 km/s.

<span class="mw-page-title-main">AG Carinae</span> Luminous variable star in the constellation Carina

AG Carinae is a star in the constellation Carina. It is classified as a luminous blue variable (LBV) and is one of the most luminous stars in the Milky Way. The great distance and intervening dust mean that the star is not usually visible to the naked eye; its apparent brightness varies erratically between magnitude 5.7 and 9.0.

HD 102350 is a single star in the constellation Centaurus. It has a yellow hue and is visible to the naked eye with an apparent visual magnitude of 4.11. The distance to this star is approximately 390 light years based on parallax, but it is drifting closer with a radial velocity of −3 km/s. It has an absolute magnitude of −1.51.

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, vol. 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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