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]
| Observation data Epoch J2000.0 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 mas[1] |
| 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 |
References
edit- ^ 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 c d 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.
- ^ a b c d 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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, Bibcode:1989ApJS...69..301G, doi:10.1086/191315.
- ^ 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 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ 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. Retrieved 2017-06-26.
{{cite web}}: CS1 maint: postscript (link) - ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.