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T Carinae - Wikipedia

From Wikipedia, the free encyclopedia

T Carinae
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Carina
Right ascension	10^h 55^m 17.22143^s^[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 (R_v)	−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 (M_V)	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]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.
^ ^a ^b ^c ^d ^e ^f ^g 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b ^c 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.
^ "HD 94776". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-15.
^ 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.
^ Mayall, Margaret W. (August 1969), "Variable Star Notes", Journal of the Royal Astronomical Society of Canada, 63: 221, Bibcode:1969JRASC..63..221M.

Constellation of Carina

Stars

Bayer	α (Canopus) β (Miaplacidus) ε (Avior) η θ ι (Aspidiske) υ χ ω
Variable	R S T (not variable) U Y RT AG BO CK EV GG HR IX OY PP (p) QZ V337 (q) V341 V343 (d) V344 (f) V345 (E) V357 (a) V371 (z²) V372 V376 (b¹) V382 (x) V399 (P) V415 (A) V448 (O) V518 V520 (w) V528 V533 (y) V560 V602 V640 V742 V752 V759 V816 V817 V906
HR	2435 (N) 2934 (Q) 3159 (D) 3220 (B) 3260 (C) 3414 (e²) 3415 (e¹) 3571 (c) 3598 (b²) 3643 (G) 3663 (i) 3696 (g) 3728 (k) 3821 (H) 3825 (h) 3856 (m) 3884 (l) 4025 (M) 4089 (L) 4102 (I) 4114 (s) 4138 (K) 4142 4159 (r) 4164 (t¹) 4177 (t²) 4205 4222 4257 (u) 4325 (z¹)
HD	53143 63765 (Tapecue) 65216 85628 93129 93250 93403 95086 97950
Other	AWI0005x3s CPD−57°2874 DEN 0817−6155 1E 1048-59 Innes' star LHS 288 NGC 3603-A1 NGC 3603-B NGC 3603-C OGLE-TR-182 OGLE-TR-211 OGLE2-TR-L9 Sher 25 WR 20a WR 21a WR 22 WR 24 WR 25 WR 30a WR 31a WR 42e

Exoplanets	OGLE-TR-111b OGLE-TR-132b OGLE-TR-113b OGLE-TR-182b OGLE-TR-211b OGLE2-TR-L9b HD 63765 b (Yvaga) HD 65216 b HD 65216 c HD 85628 Ab HD 95086 b (Levantes) Gliese 422 b

Star
clusters

NGC	2516 2808 3114 3293 3324 3532 3603
Other	Carina OB1 Carina OB2 Collinder 228 IC 2602 IC 2714 Platais 8 Trumpler 14 Trumpler 15 Trumpler 16 Westerlund 2

Nebulae

NGC	2867 3199 3576 3579 3581 3582 3584 3586
Other	Carina Nebula Finger of God Globule G290.1-0.8 Hen 2-47 Homunculus Nebula IC 2220 IC 2448 IGR J11014−6103 RCW 49

Galaxies

NGC	3059
Other	Carina Dwarf Spheroidal Galaxy

Galaxy clusters	Bullet Cluster

Astronomical events	GRB 000131 GRB 080916C