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HR 3831 
Summary
HR 3831, also known as HD 83368, is a binary star system in the southern constellation of Vela at a distance of 233 light years. This object is barely visible to the naked eye as a dim, blue star with an apparent visual magnitude of 6.232. It is approaching the Earth with a heliocentric radial velocity of 4.0±0.3 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 36m 25.4069s[1] |
| Declination | –48° 45′ 04.2549″[1] |
| Apparent magnitude (V) | 6.232 |
| Characteristics | |
| HD 83368A | |
| Spectral type | A8V[1] |
| Apparent magnitude (G) | 6.219[2] |
| Variable type | Rapidly oscillating Ap |
| HD 83368B | |
| Spectral type | F9V[3] |
| Apparent magnitude (G) | 8.995[4] |
| Astrometry | |
| HD 83368A | |
| Proper motion (μ) | RA: -8.16±0.03 mas/yr[2] Dec.: -18.85±0.03 mas/yr[2] |
| Parallax (π) | 14.01 ± 0.03 mas[2] |
| Distance | 232.8 ± 0.5 ly (71.4 ± 0.2 pc) |
| HD 83368B | |
| Radial velocity (Rv) | -4.0±0.3[4] km/s |
| Proper motion (μ) | RA: -9.41±0.19 mas/yr[4] Dec.: -14.00±0.17 mas/yr[4] |
| Parallax (π) | 14.31 ± 0.15 mas[4] |
| Distance | 228 ± 2 ly (69.9 ± 0.7 pc) |
| Details | |
| HD 83368A | |
| Mass | 1.78+0.12 −0.17[5] M☉ |
| Radius | 2.003[6] R☉ |
| Luminosity (bolometric) | 12.33[6] L☉ |
| Surface gravity (log g) | 4.2[6] cgs |
| Temperature | 7650[6] K |
| Rotation | 2.851976±0.00003 d[6] |
| Rotational velocity (v sin i) | 33.8±1.0[5] km/s |
| Age | 0.93+0.42 −0.34[5] Gyr |
| HD 83368B | |
| Surface gravity (log g) | 4 cgs |
| Other designations | |
| HD 83368A: 2MASS J09362541-4845042, TYC 8176-283-1 | |
| HD 83368B: 2MASS J09362537-4845072, Gaia DR2 5410092611662456704, TYC 8176-2818-1 | |
| Database references | |
| SIMBAD | data |
The star system is a visual binary with a 3.29″ projected separation,[6] identified as such in 2002.[7] The larger star, HD 83368A, is a pulsating variable of a rapidly oscillating Ap type. It has a single yet strongly distorted dipole pulsation mode with a frequency of 1427 µHz.[8] The primary star is chemically peculiar, exhibiting spots of enhanced concentrations of lithium, europium and oxygen.[6]
See also edit
References edit
- ^ a b c d "HD 83368". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 30, 2021.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ "HD 83368B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 30, 2021.
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c Sikora, J.; Wade, G. A.; Power, J.; Neiner, C. (2019), "A volume-limited survey of MCP stars within 100 pc – I. Fundamental parameters and chemical abundances", Monthly Notices of the Royal Astronomical Society, 483 (2): 2300–2324, arXiv:1811.05633, Bibcode:2019MNRAS.483.2300S, doi:10.1093/mnras/sty3105
- ^ a b c d e f g Kochukhov, O. (2005), "Pulsational line profile variation of the roAp star HR 3831", Astronomy & Astrophysics, 446 (3): 1051–1070, arXiv:astro-ph/0509446, doi:10.1051/0004-6361:20053345, S2CID 13102520
- ^ Schöller, M.; Correia, S.; Hubrig, S.; Kurtz, D. W. (2002), "Multiplicity of rapidly oscillating Ap stars", Astronomy & Astrophysics, 545: A38, arXiv:1208.0480, doi:10.1051/0004-6361/201118538, S2CID 119311263
- ^ Bigot, L.; Kurtz, D. W. (2011), "Theoretical light curves of dipole oscillations in roAp stars", Astronomy & Astrophysics, 536: A73, arXiv:1110.0988, Bibcode:2011A&A...536A..73B, doi:10.1051/0004-6361/201116981, S2CID 54532822
