Astronomy:HD 73634
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 37m 38.63278s[1] |
| Declination | −42° 59′ 20.6894″[1] |
| Apparent magnitude (V) | +4.11[2] |
| Characteristics | |
| Spectral type | A7Ia[3] or A6II[4] |
| B−V color index | 0.109±0.011[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.3±0.6[2] km/s |
| Proper motion (μ) | RA: −10.75±0.13[1] mas/yr Dec.: +9.66±0.12[1] mas/yr |
| Parallax (π) | 1.79 ± 0.15[1] mas |
| Distance | 1,800 ± 200 ly (560 ± 50 pc) |
| Absolute magnitude (MV) | −4.61[2] |
| Details | |
| Mass | 7.8±0.2[5] M☉ |
| Radius | 33.69+2.42 −3.24[6] R☉ |
| Luminosity | 4,140.2±594.5[6] L☉ |
| Temperature | 7,977+415 −271[6] K |
| Age | 39.8±4.9[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 73634 is a single[8] star in the southern constellation of Vela. It has the Bayer designation e Velorum; HD 73634 is the star's designation from the Henry Draper Catalogue. The star is white in hue and is faintly visible to the naked eye, having an apparent visual magnitude of +4.11.[2] Parallax measurements provide a distance estimate of approximately 1,800 light years from the Sun. It is drifting further away with a radial velocity of +19 km/s.[2]
This evolved object has received stellar classifications of A7Ia[3] and A6II,[4] indicating that it is a massive supergiant or bright giant star. It has 7.8 times the mass of the Sun and is around 40 million years old.[5] The star has expanded to nearly 34 times the girth of the Sun and is radiating around 4,140 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 7,977 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Stephenson, C. B.; Sanduleak, N. (1971). "Luminous stars in the Southern Milky Way". Publication of the Warner and Swasey Observatory (Cleveland, Ohio: Case Western Reserve University) 1: 1. Bibcode: 1971PW&SO...1a...1S.
- ↑ 4.0 4.1 Gray, R. O.; Garrison, R. F. (1989). "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". The Astrophysical Journal Supplement Series 70: 623. doi:10.1086/191349. Bibcode: 1989ApJS...70..623G.
- ↑ 5.0 5.1 5.2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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.
- ↑ 6.0 6.1 6.2 6.3 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.
- ↑ "e Vel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=e+Vel.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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