 A light curve for IM Velorum (HR 3831), plotted from TESS data. The 2.852 day period is shown in red. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09 36 25.4069 |
| Declination | –48° 45′ 04.2549″ |
| Apparent magnitude (V) | 6.232 |
| Characteristics | |
| HD 83368A | |
| Spectral type | A8V |
| Apparent magnitude (G) | 6.219 |
| Variable type | Rapidly oscillating Ap |
| HD 83368B | |
| Spectral type | F9V |
| Apparent magnitude (G) | 8.995 |
| Astrometry | |
| HD 83368A | |
| Proper motion (μ) | RA: -8.16±0.03 mas/yr Dec.: -18.85±0.03 mas/yr |
| Parallax (π) | 14.01 ± 0.03 mas |
| Distance | 232.8 ± 0.5 ly (71.4 ± 0.2 pc) |
| HD 83368B | |
| Radial velocity (Rv) | -4.0±0.3 km/s |
| Proper motion (μ) | RA: -9.41±0.19 mas/yr Dec.: -14.00±0.17 mas/yr |
| Parallax (π) | 14.31 ± 0.15 mas |
| Distance | 228 ± 2 ly (69.9 ± 0.7 pc) |
| Details | |
| HD 83368A | |
| Mass | 1.78 −0.17 M☉ |
| Radius | 2.003 R☉ |
| Luminosity (bolometric) | 12.33 L☉ |
| Surface gravity (log g) | 4.2 cgs |
| Temperature | 7650 K |
| Rotation | 2.851976±0.00003 d |
| Rotational velocity (v sin i) | 33.8±1.0 km/s |
| Age | 0.93 −0.34 Gyr |
| HD 83368B | |
| Surface gravity (log g) | 4 cgs |
| Other designations | |
| CD−48 4831, HD 83368, HIP 47145, HR 3831, SAO 221339, GSC 08176-00283, IM Vel | |
| 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 |
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.
The star system is a visual binary with a 3.29″ projected separation, identified as such in 2002. 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. The primary star is chemically peculiar, exhibiting spots of enhanced concentrations of lithium, europium and oxygen.
The star's variability was discovered by Pierre Renson, and announced in 1977. It was given its variable star designation, IM Velorum, in 1981.
See also
References
- "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 27 September 2024.
- Kurtz, D. W.; van Wyk, F; Roberts, G.; Marang, F.; Handler, G.; Medupe, R.; Kilkenny, D. (May 1997). "Frequency variability in the rapidly oscillating AP star HR 3831: three more years of monitoring". Monthly Notices of the Royal Astronomical Society. 287 (1): 69–78. Bibcode:1997MNRAS.287...69K. doi:10.1093/mnras/287.1.69.
- ^ "HD 83368". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 30, 2021.
- ^ 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.
- ^ 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.
- ^ 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
- ^ 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
- Renson, P. (20 May 1977). "Periodicite d'Etoiles Ap Australes" (PDF). Invormal Bulletin on Variable Stars. 1280: 1. Bibcode:1977IBVS.1280....1R. Retrieved 20 October 2024.
- Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). "65th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1921: 1. Bibcode:1981IBVS.1921....1K. Retrieved 20 October 2024.
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