Astronomy:HD 74272
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 08h 41m 13.12966s[2] |
| Declination | −47° 19′ 01.6610″[2] |
| Apparent magnitude (V) | 4.74[1] |
| Characteristics | |
| Spectral type | A5 II[3] |
| B−V color index | 0.137±0.029[1] |
| Astrometry | |
| Radial velocity (Rv) | +17.4±2.8[1] km/s |
| Proper motion (μ) | RA: −8.228[2] mas/yr Dec.: +10.051[2] mas/yr |
| Parallax (π) | 1.7639 ± 0.1441[2] mas |
| Distance | 1,800 ± 200 ly (570 ± 50 pc) |
| Absolute magnitude (MV) | −4.67[1] |
| Details | |
| Mass | 8.8±0.1[4] M☉ |
| Radius | 33.11+1.76 −0.82[2] R☉ |
| Luminosity | 3,287±312[2] L☉ |
| Surface gravity (log g) | 2.04±0.09[5] cgs |
| Temperature | 7,370±74[5] K |
| Metallicity [Fe/H] | −0.46±0.05[5] dex |
| Rotational velocity (v sin i) | 15.1±1.2[5] km/s |
| Age | 29.8±3.4[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[1] It is located at a distance of approximately 1,800 light years from the Sun based on parallax.[2] The star is drifting further away with a radial velocity of +17 km/s.[1]
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[2] times the radius of the Sun. The star is radiating 3,287[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 7,370 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 4.2 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
- ↑ 5.0 5.1 5.2 5.3 5.4 Borisov, S. B. et al. (2023). "New Generation Stellar Spectral Libraries in the Optical and Near-infrared. I. The Recalibrated UVES-POP Library for Stellar Population Synthesis". The Astrophysical Journal Supplement Series 266 (1): 11. doi:10.3847/1538-4365/acc321. Bibcode: 2023ApJS..266...11B.
- ↑ "n Vel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=n+Vel.
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