HD 74272

HD 74272 is a star in the constellation Vela. It has the Bayer designation n Velorum, while HD 74272 is the identifier from the Henry Draper catalogue. This is a white hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.74.[2] It is located at a distance of approximately 1,800 light years from the Sun based on parallax.[1] The star is drifting further away with a radial velocity of +17 km/s.[2]

This article is about n Velorum. For N Velorum, see HD 82668.
HD 74272
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension 08h 41m 13.12966s[1]
Declination −47° 19′ 01.6610″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type A5 II[3]
B−V color index 0.137±0.029[2]
Astrometry
Radial velocity (Rv)+17.4±2.8[2] km/s
Proper motion (μ) RA: −8.228[1] mas/yr
Dec.: +10.051[1] mas/yr
Parallax (π)1.7639 ± 0.1441 mas[1]
Distance1,800 ± 200 ly
(570 ± 50 pc)
Absolute magnitude (MV)−4.67[2]
Details
Mass8.8±0.1[4] M☉
Radius33.11+1.76
−0.82[1] R☉
Luminosity3,287±312[1] L☉
Temperature7,595+96
−194[1] K
Rotational velocity (v sin i)[5] km/s
Age29.8±3.4[4] Myr
Other designations
n Vel, CD−46°4448, FK5 2570, HD 74272, HIP 42624, HR 3452, SAO 220284[6]
Database references
SIMBADdata

This is an aging, massive bright giant star with a stellar classification of A5 II.[3] It is an estimated 30 million years old with 8.8 times the mass of the Sun.[4] Having exhausted the supply of hydrogen at its core, it has expanded to around 33[1] times the radius of the Sun. The star is radiating 3,287[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 7,595 K.[1]

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 (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 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
  5. Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
  6. "n Vel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-19.
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