HD 158220 is a giant Be star in the southern constellation of Ara. Its apparent magnitude is 5.9, makeing it faintly visible to the naked eye under good observing conditions. This is a pulsating variable star that changes brightness by an amplitude of 0.030 magnitude over a period of 1.15 days.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 31m 23.28387s[2] |
| Declination | −56° 55′ 15.4672″[2] |
| Apparent magnitude (V) | 5.95[3] |
| Characteristics | |
| Spectral type | B7II-III[4] |
| B−V color index | −0.08[3] |
| Variable type | Be star[5] |
| Astrometry | |
| Radial velocity (Rv) | -3[6] km/s |
| Proper motion (μ) | RA: −0.29[2] mas/yr Dec.: −3.72[2] mas/yr |
| Parallax (π) | 1.78 ± 0.34 mas[2] |
| Distance | approx. 1,800 ly (approx. 600 pc) |
| Details | |
| Luminosity | 1,176[7] L☉ |
| Temperature | 9,657[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The Hipparcos data revealed that HD 158220 is a variable star. It was given its variable star designation, V862 Arae, in 1999.[8]
References
edit- ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
- ^ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
- ^ a b Percy, John R.; et al. (February 2004), "Short-Period Variable Be Stars Discovered or Confirmed through Self-Correlation Analysis of Hipparcos Epoch Photometry", The Publications of the Astronomical Society of the Pacific, 116 (816): 178–183, Bibcode:2004PASP..116..178P, doi:10.1086/382246, S2CID 120898311
- ^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
- ^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659. Bibcode:1999IBVS.4659....1K. Retrieved 25 November 2024.
External links
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