Astronomy:V344 Carinae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina |
| Right ascension | 08h 46m 42.54928s[2] |
| Declination | −56° 46′ 11.1922″[2] |
| Apparent magnitude (V) | 4.50[3] (4.40–4.51)[4] |
| Characteristics | |
| Spectral type | B3V(n)[5] |
| B−V color index | −0.169±0.008[3] |
| Variable type | Be[6] |
| Astrometry | |
| Radial velocity (Rv) | +27.0±7.4[3] km/s |
| Proper motion (μ) | RA: −9.29[2] mas/yr Dec.: +8.85[2] mas/yr |
| Parallax (π) | 5.39 ± 0.14[2] mas |
| Distance | 610 ± 20 ly (186 ± 5 pc) |
| Absolute magnitude (MV) | −1.84[3] |
| Details | |
| Mass | 7.1±0.1[7] M☉ |
| Radius | 3.00±0.06[8] R☉ |
| Luminosity | 2,328+120 −105[9] L☉ |
| Surface gravity (log g) | 3.79±0.18[9] cgs |
| Temperature | 17,660±560[9] K |
| Rotational velocity (v sin i) | 268±18[9] km/s |
| Age | 31.6±3.9[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V344 Carinae is a single[11] 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.[3] Historically, it was mentioned in the Almagest, suggesting that some time around 130 BCE it was brighter than its current magnitude.[12] This object is located at a distance of approximately 610 light-years from the Sun based on parallax.[2] The star is drifting further away with a radial velocity of around +27 km/s.[3]
This is a B-type main-sequence star with a stellar classification of B3V(n).[5] It is a Be star; a rapidly rotating star that is hosting a circumstellar disk of hot, decreted gas.[13] It is a photometrically variable Be star, having a brightness that ranges from 4.4 down to 4.51 in visual magnitude, and has been classified as a Gamma Cassiopeiae variable.[4] The star is 32[7] million years old and is spinning with a projected rotational velocity of 268 km/s.[9] It has seven[7] times the mass of the Sun and around 3.0[8] times the Sun's radius. The star is radiating 2,328[9] times the luminosity of the Sun from its photosphere at an effective temperature of 17,660 K.[9]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 V344 Carinae, https://www.aavso.org/vsx/index.php?view=detail.top&oid=6097, retrieved 2020-02-19.
- ↑ 5.0 5.1 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.
- ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 7.0 7.1 7.2 7.3 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 8.0 8.1 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, doi:10.1093/mnras/stx3075, Bibcode: 2018MNRAS.474.5287A.
- ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 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, doi:10.1051/0004-6361/201628760, Bibcode: 2016A&A...595A.132Z.
- ↑ "f Car". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Car.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1093/mnras/209.3.533, Bibcode: 1984MNRAS.209..533H.
- ↑ Touhami, Y. et al. (March 2011), "The Infrared Continuum Sizes of Be Star Disks", The Astrophysical Journal 729 (1): 8, doi:10.1088/0004-637X/729/1/17, 17, Bibcode: 2011ApJ...729...17T.
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