HD 156768
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 22m 55.22084s[1] |
| Declination | −58° 00′ 37.1661″[1] |
| Apparent magnitude (V) | 5.86[2] (6.1 + 9.6)[3] |
| Characteristics | |
| Spectral type | G8Ib/II[4] |
| U−B color index | +0.86[5] |
| B−V color index | +1.07[5] |
| Astrometry | |
| Radial velocity (Rv) | −9.8±0.2[2] km/s |
| Proper motion (μ) | RA: −6.52[1] mas/yr Dec.: −14.35[1] mas/yr |
| Parallax (π) | 2.98 ± 0.52[1] mas |
| Distance | approx. 1,100 ly (approx. 340 pc) |
| Details | |
| HD 156768 A | |
| Luminosity | 616[6] L☉ |
| Temperature | 4,798[6] K |
| Rotational velocity (v sin i) | 2.6±1.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 156768 is a double star in the southern constellation of Ara. The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II.[4] The magnitude 9.6 companion lies at an angular separation of 1.81″ along a position angle of 184°.[3]
References
- 1 2 3 4 5 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.
- 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics 356: 141–145, Bibcode:2000A&A...356..141F.
- 1 2 Houk, Nancy; Cowley, A. P. (1979), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor : Dept. of Astronomy (Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan) 1, Bibcode:1978mcts.book.....H.
- 1 2 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
- 1 2 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
- ↑ De Medeiros, J. R.; et al. (November 2002), "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars", Astronomy and Astrophysics 395: 97–98, Bibcode:2002A&A...395...97D, doi:10.1051/0004-6361:20021214
External links
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This article is issued from Wikipedia - version of the Sunday, January 24, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.