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V344 Carinae

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Star in the constellation Carina
V344 Carinae

A light curve for V344 Carinae, plotted from TESS data
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 08 46 42.54928
Declination −56° 46′ 11.1922″
Apparent magnitude (V) 4.50 (4.40–4.51)
Characteristics
Spectral type B3V(n)
B−V color index −0.169±0.008
Variable type Be
Astrometry
Radial velocity (Rv)+27.0±7.4 km/s
Proper motion (μ) RA: −9.29 mas/yr
Dec.: +8.85 mas/yr
Parallax (π)5.39 ± 0.14 mas
Distance610 ± 20 ly
(186 ± 5 pc)
Absolute magnitude (MV)−1.84
Details
Mass7.1±0.1 M☉
Radius3.00±0.06 R☉
Luminosity2,328+120
−105 L☉
Surface gravity (log g)3.79±0.18 cgs
Temperature17,660±560 K
Rotational velocity (v sin i)268±18 km/s
Age31.6±3.9 Myr
Other designations
f Car, V344 Car, CPD−56°1865, FK5 2695, GC 12138, HD 75311, HIP 43105, HR 3498, SAO 236268
Database references
SIMBADdata

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.

This is a B-type main-sequence star with a stellar classification of B3V(n). It is a Be star; a rapidly rotating star that is hosting a circumstellar disk of hot, decreted gas. In 1951, Alan William James Cousins announced his discovery that the star, then known as f Carinae, is a photometrically variable star. It was given its variable star designation in 1975. Its brightness ranges from 4.4 down to 4.51 in visual magnitude, and it has been classified as a Gamma Cassiopeiae variable. The star is 32 million years old and is spinning with a projected rotational velocity of 268 km/s. It has seven times the mass of the Sun and around 3.0 times the Sun's radius. The star is radiating 2,328 times the luminosity of the Sun from its photosphere at an effective temperature of 17,660 K.

References

  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ 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, S2CID 18759600.
  3. ^ 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.
  4. ^ "V344 Carinae", Variable Star Index, retrieved 2020-02-19.
  5. ^ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  6. 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.
  7. ^ 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, S2CID 118629873.
  8. ^ Arcos, C.; et al. (March 2018), "Stellar parameters and H α line profile variability of Be stars in the BeSOS survey", Monthly Notices of the Royal Astronomical Society, 474 (4): 5287–5299, arXiv:1711.08675, Bibcode:2018MNRAS.474.5287A, doi:10.1093/mnras/stx3075, S2CID 74872624.
  9. ^ Zorec, J.; et al. (November 2016), "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity", Astronomy & Astrophysics, 595: 26, Bibcode:2016A&A...595A.132Z, doi:10.1051/0004-6361/201628760, hdl:11336/37946.
  10. "f Car". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 March 2016.
  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, S2CID 14878976.
  12. Hertzog, K. P. (August 1984), "Supernova progenitors and Be stars : stellar variability from a 21 century perspective", Monthly Notices of the Royal Astronomical Society, 209 (3): 533–541, Bibcode:1984MNRAS.209..533H, doi:10.1093/mnras/209.3.533.
  13. Touhami, Y.; et al. (March 2011), "The Infrared Continuum Sizes of Be Star Disks", The Astrophysical Journal, 729 (1): 8, arXiv:1101.1698, Bibcode:2011ApJ...729...17T, doi:10.1088/0004-637X/729/1/17, S2CID 119294318, 17.
  14. Cousins, A. W. J. (October 1951). "Bright variable stars in southern hemisphere (first list)". The Observatory. 71: 199–201. Bibcode:1951Obs....71..199C. Retrieved 9 January 2025.
  15. Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975). "60th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 961: 1–15. Bibcode:1975IBVS..961....1K. Retrieved 9 January 2025.
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