| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09 36 49.53851 |
| Declination | −49° 21′ 18.0873″ |
| Apparent magnitude (V) | 4.34 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A7 V |
| B−V color index | 0.173±0.005 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | +17.8±0.5 km/s |
| Proper motion (μ) | RA: −130.55 mas/yr Dec.: +42.98 mas/yr |
| Parallax (π) | 30.4562 ± 0.1933 mas |
| Distance | 107.1 ± 0.7 ly (32.8 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.79 |
| Details | |
| Mass | 1.8+0.11 −0.09 M☉ |
| Luminosity | 15.99 L☉ |
| Surface gravity (log g) | 4.3±0.14 cgs |
| Temperature | 8,331±283 K |
| Rotational velocity (v sin i) | 155 km/s |
| Age | 453+256 −278 Myr |
| Other designations | |
| M Vel, CD−48° 4836, FK5 2768, HD 83446, HIP 47175, HR 3836, SAO 221344 | |
| Database references | |
| SIMBAD | data |
HD 83446 is a probable astrometric binary star system in the constellation Vela. It is visible to the naked eye with an apparent visual magnitude of 4.34. Based upon an annual parallax shift of 30.5 mas, it is located 107.1 light years from the Sun. The system is moving further away with a heliocentric radial velocity of +18 km/s.
The visible component is an A-type main-sequence star with a stellar classification of A7 V. Observations with the BRITE constellation led to this star's identification as a Delta Scuti variable with pulsation frequencies of 31.0806 and 34.2098 cycles per day, corresponding to periods of 46.3 and 42.1 minutes, respectively. It has a high rate of spin with a projected rotational velocity of 155 km/s, which is giving the star an oblate shape with an equatorial bulge that is 6% larger than the polar radius. The star is roughly 453 million years old with 1.8 times the mass of the Sun. It is radiating 16 times the Sun's luminosity from its photosphere at an effective temperature of 8,331 K.
References
- ^ 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.
- ^ 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.
- Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- ^ Zwintz, K. (September 2017), "A BRITE view on δ Scuti and γ Doradus stars", in Zwintz, Konnstanze; Poretti, Ennio (eds.), Second BRITE-Constellation Science Conference: Small satellites—big science, Proceedings of the Polish Astronomical Society volume 5, held 22-26 August, 2016 in Innsbruck, Austria, vol. 5, Bartycka 18, 00-716 Warsaw, Poland: Polish Astronomical Society, pp. 228–235, arXiv:1611.04917, Bibcode:2017sbcs.conf..228Z
{{citation}}: CS1 maint: location (link) - ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Gullikson, Kevin; et al. (2016), "The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
- ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
- "HD 83446". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-08.
- Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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