Astronomy:HD 191984
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Short description: Double star in the constellation Aquila
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 12m 35.12436s[1] |
| Declination | +00° 52′ 01.3864″[1] |
| Apparent magnitude (V) | 6.246[2] |
| Characteristics | |
| Spectral type | B9p CR(EU SR)[3] + A0[4] |
| U−B color index | −0.033[2] |
| B−V color index | +0.090[2] |
| Astrometry | |
| Radial velocity (Rv) | −19[5] km/s |
| Proper motion (μ) | RA: +2.12[1] mas/yr Dec.: −20.85[1] mas/yr |
| Parallax (π) | 5.54 ± 1.10 mas |
| Distance | approx. 600 ly (approx. 180 pc) |
| Details | |
| Luminosity | 82[6] L☉ |
| Temperature | 8,477[6] K |
| Rotational velocity (v sin i) | 150[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
HD 191984 is a double star in the equatorial constellation of Aquila. As of 2011, the components have an angular separation of 2.52″ along a position angle of 205.7°.[8]
References
- ↑ 1.0 1.1 1.2 1.3 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 Rakos, K. D. et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series 47: 221–235, Bibcode: 1982A&AS...47..221R
- ↑ Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R, https://zenodo.org/record/890529
- ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Washington (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W
- ↑ 6.0 6.1 McDonald, I.; Zijlstra, A. A; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
- ↑ Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A
- ↑ Mason, Brian D. et al. (May 2012), "Speckle Interferometry at the U.S. Naval Observatory. XVIII", The Astronomical Journal 143 (5): 6, doi:10.1088/0004-6256/143/5/124, 124, Bibcode: 2012AJ....143..124M, https://apps.dtic.mil/sti/pdfs/ADA561759.pdf
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