V448 Carinae

V448 Carinae

A light curve for V448 Carinae, plotted from TESS data[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Carina
Right ascension	06^h 47^m 18.70799^s[2]
Declination	−55° 32′ 23.9659″[2]
Apparent magnitude (V)	5.60[3] (5.66 to 5.86)[4]
Characteristics
Spectral type	K5III[5]
B−V color index	+1.549±0.010[3]
Variable type	SRd:[4]
Astrometry
Radial velocity (Rv)	+25.58±4.64[2] km/s
Proper motion (μ)	RA: −0.99[6] mas/yr Dec.: +25.05[6] mas/yr
Parallax (π)	4.8123 ± 0.0860 mas[2]
Distance	680 ± 10 ly (208 ± 4 pc)
Absolute magnitude (MV)	−0.72[3]
Details
Mass	1.73[7] M☉
Radius	50.90+1.15 −5.11[2] R☉
Luminosity	582.2±12.9[2] L☉
Temperature	3,974+216 −44[2] K
Age	2.85[7] Gyr
Other designations
O Car, V448 Car, NSV 3220, CPD−55°1063, GC 8912, HD 49877, HIP 32531, HR 2526, SAO 234710[8]
Database references
SIMBAD	data

V448 Carinae is a single[9] 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.[3] 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.[2]

This is an aging giant star with a stellar classification of K5III.[5] Having exhausted the supply of hydrogen at its core, it has cooled and expanded off the main sequence and now has 51 times the girth of the Sun.[2]

Analysis of the Hipparcos data showed that the star is a variable star. It was given its variable star designation in 1999.[10] It is classified as a probable semiregular variable star with a sub-type of SRd and a brightness that varies from visual magnitude 5.66 down to 5.86 over a period of 56.5 days.[4] The star is an estimated 2.85 billion years old with 1.73 times the mass of the Sun.[7] It is radiating 582 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,974 K.[2]

References

1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
2. 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.
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. 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.
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. 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.
7. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
8. "V448 Car". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-19.
9. 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.
10. Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K. Retrieved 22 December 2024.