Astronomy:Theta Gruis
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Short description: Star in the constellation Grus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 23h 06m 52.73046s[1] |
| Declination | −43° 31′ 13.2857″[1] |
| Apparent magnitude (V) | 4.28[2] (4.51 + 6.84 + 7.80)[3] |
| Characteristics | |
| Spectral type | kF3VhF5mF5(II-III)[4] + ? + G2V[3] |
| U−B color index | +0.16[2] |
| B−V color index | +0.42[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.6[5] km/s |
| Proper motion (μ) | RA: −47.17[1] mas/yr Dec.: −13.49[1] mas/yr |
| Parallax (π) | 24.73 ± 0.45[1] mas |
| Distance | 132 ± 2 ly (40.4 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.25[6] |
| Details | |
| θ Gru A | |
| Luminosity | 27[6] L☉ |
| Rotational velocity (v sin i) | 64[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Gruis, Latinized from θ Gruis, is a triple star[3] system in the southern constellation of Grus. Its combined apparent visual magnitude is 4.28,[2] which is bright enough to be seen with the naked eye. The system contains a magnetic Delta Delphini-like[9] F5 star with a close fainter companion, plus a more distant G2 main sequence star.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 2.3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N.
- ↑ 3.0 3.1 3.2 3.3 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Gray, R. O.; Garrison, R. F. (1989), "The early F-type stars - Refined classification, confrontation with Stromgren photometry, and the effects of rotation", Astrophysical Journal Supplement Series 69: 301, doi:10.1086/191315, Bibcode: 1989ApJS...69..301G.
- ↑ 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.
- ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U.
- ↑ "tet Gru". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tet+Gru.
- ↑ 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.
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