HD 49268

HD 49268 is a giant star in the southern constellation Volans located 461 light years away from the Sun based on parallax. The star is also called HR 2505. With an apparent visual magnitude of +6.49, it is barely visible to the naked eye. It is drifting further away with a radial velocity of +21.[1] The stellar classification of HD 49268 is K1 III CNII,[3] which notation indicates this is an aging K-type star that has exhausted the supply of hydrogen at its core. The suffix, 'CN II', means the spectrum shows a strong over-abundance of the cyano radical in the stellar atmosphere. It has expanded to 11 times the girth of the Sun and is radiating 58 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,741 K.

HD 49268
Observation data
Epoch J2000      Equinox J2000
Constellation Volans
Right ascension 06h 40m 57.60339s[1]
Declination −71° 46′ 30.6842″[1]
Apparent magnitude (V) 6.50[2]
Characteristics
Spectral type K1 III CNII[3]
B−V color index 1.110±0.015[2]
Astrometry
Radial velocity (Rv)+21.36±0.20[1] km/s
Proper motion (μ) RA: −35.74[1] mas/yr
Dec.: +21.159[1] mas/yr
Parallax (π)7.0808 ± 0.0196[1] mas
Distance461 ± 1 ly
(141.2 ± 0.4 pc)
Absolute magnitude (MV)+0.89[2]
Details
Mass1.3[4] M☉
Radius11.33+0.18
−1.20[1] R☉
Luminosity58.4±0.3[1] L☉
Surface gravity (log g)2.45[4] cgs
Temperature4,741+274
−37[1] K
Metallicity [Fe/H]+0.04[4] dex
Rotational velocity (v sin i)<1.6[5] km/s
Other designations
CD−71°357, HD 49268, HIP 31977, HR 2505, SAO 256326, WDS J06410-7147A[6]
Database references
SIMBADdata

HD 49268 has two faint companions listed in the Washington Double Star Catalogue: a tenth magnitude star 17″ away; and a 13th magnitude star 65″ away. Both are unrelated background stars.[7]

References
  1. 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.
  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, S2CID 119257644.
  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. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy and Astrophysics, 628: A94, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765.
  5. De Medeiros, J. R.; et al. (2014), "A catalog of rotational and radial velocities for evolved stars", Astronomy and Astrophysics, 561, A126, arXiv:1312.3474, Bibcode:2014A&A...561A.126D, doi:10.1051/0004-6361/201220762.
  6. "HD 49268". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-19.
  7. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2021-01-19
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