V343 Carinae

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.[2] 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.[2]

V343 Carinae
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension  08h 40m 37.02758s[1]
Declination −59° 45′ 39.6067″[1]
Apparent magnitude (V) 4.31[2]
Characteristics
Spectral type B1.5III[3]
B−V color index −0.117±0.005[2]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)+12.9±0.7[2] km/s
Proper motion (μ) RA: −6.63[1] mas/yr
Dec.: +5.32[1] mas/yr
Parallax (π)2.26 ± 0.11[1] mas
Distance1,440 ± 70 ly
(440 ± 20 pc)
Absolute magnitude (MV)−3.91[2]
Details
Mass12.5±0.6[5] M☉
Luminosity6,322.92[2] L☉
Temperature27,600±3,630[6] K
Age15.7±0.1[5] Myr
Other designations
d Car, V343 Car, CPD−59°1080, FK5 2685, GC 11964, HD 74375, HIP 42568, HR 3457, SAO 236181, CCDM J08406-5946, WDS J08406-5946A[7]
Database references
SIMBADdata

This star was originally thought to be a Beta Cephei variable and a suspected eclipsing binary[8] with an orbital period of 133.92 days. It is now considered as probably constant.[9][4] Measurements indicate that at most it is a microvariable star with an amplitude of 0.0041 in visual magnitude and a period of 0.42029 cycles per day.[10] Eggleton and Tokovinin (2008) catalogued this as a single star, albeit with some uncertainty.[11] However, Chini et al. (2012) listed it as a single-lined spectroscopic binary system.[12]

The visible component of V343 Carinae has a stellar classification of B1.5III,[3] matching a massive blue giant. It has 12.5[5] times the mass of the Sun and is an estimated 16[5] million years old. The star is radiating 6,323[2] times the Sun's luminosity from its photosphere at an effective temperature of 27,600 K.[6] It has a visual magnitude 13.3 companion at an angular separation of 16.4″ along a position angle of 339°, as of 2010.[13]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 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.
  3. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 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.
  5. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  6. Sokolov, N. A. (May 1995), "The determination of Teff of B, A and F main sequence stars from the continuum between 3200 A and 3600 A.", Astronomy and Astrophysics Supplement, 110: 553, Bibcode:1995A&AS..110..553S.
  7. "d Car". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 March 2016.
  8. van Hoof, A. (June 1973), "Six New Variable B-Stars", Information Bulletin on Variable Stars, 807: 1, Bibcode:1973IBVS..807....1V.
  9. Waelkens, C.; Rufener, F. (May 1983), "An observational study of the influence of close companions on the pulsations of beta Cephei stars", Astronomy and Astrophysics, 121: 45–50, Bibcode:1983A&A...121...45W.
  10. Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
  11. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  12. Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925, arXiv:1205.5238, Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x.
  13. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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