Astronomy:HD 83446
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 36m 49.53851s[1] |
| Declination | −49° 21′ 18.0873″[1] |
| Apparent magnitude (V) | 4.34[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A7 V[4] |
| B−V color index | 0.173±0.005[2] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | +17.8±0.5[6] km/s |
| Proper motion (μ) | RA: −130.55[1] mas/yr Dec.: +42.98[1] mas/yr |
| Parallax (π) | 30.4562 ± 0.1933[1] mas |
| Distance | 107.1 ± 0.7 ly (32.8 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.79[2] |
| Details | |
| Mass | 1.8+0.11 −0.09[7] M☉ |
| Luminosity | 15.99[2] L☉ |
| Surface gravity (log g) | 4.3±0.14[7] cgs |
| Temperature | 8,331±283[7] K |
| Rotational velocity (v sin i) | 155[8] km/s |
| Age | 453+256 −278[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 83446 is a probable astrometric binary[10] star system in the constellation Vela. It is visible to the naked eye with an apparent visual magnitude of 4.34.[2] Based upon an annual parallax shift of 30.5 mas,[1] 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.[6]
The visible component is an A-type main-sequence star with a stellar classification of A7 V.[4] 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.[5] 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.[8] The star is roughly 453[7] million years old with 1.8[7] times the mass of the Sun. It is radiating 16[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,331 K.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 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.
- ↑ Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 5.0 5.1 Zwintz, K. (September 2017), "A BRITE view on δ Scuti and γ Doradus stars", in Zwintz, Konnstanze; Poretti, Ennio, 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, 5, Bartycka 18, 00-716 Warsaw, Poland: Polish Astronomical Society, pp. 228–235, Bibcode: 2017sbcs.conf..228Z
- ↑ 6.0 6.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Gullikson, Kevin et al. (2016), "The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars", The Astronomical Journal 152 (2): 40, doi:10.3847/0004-6256/152/2/40, Bibcode: 2016AJ....152...40G.
- ↑ 8.0 8.1 Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
- ↑ "HD 83446". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+83446.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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