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]
| 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] |
| Distance | 1,800 ± 200 ly (570 ± 50 pc) |
| Absolute magnitude (MV) | −4.67[2] |
| Details | |
| Mass | 8.8±0.1[4] M☉ |
| Radius | 33.11+1.76 −0.82[1] R☉ |
| Luminosity | 3,287±312[1] L☉ |
| Temperature | 7,595+96 −194[1] K |
| Rotational velocity (v sin i) | [5] km/s |
| Age | 29.8±3.4[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ a b c d e f g h i j k l 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.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ a b c 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
- ^ 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.
- ^ "n Vel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-19.