Astronomy:Kappa Normae
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Short description: Star in the constellation Norma
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Norma[1] |
| Right ascension | 16h 13m 28.72874s[2] |
| Declination | −54° 37′ 49.6860″[2] |
| Apparent magnitude (V) | 4.94[3] |
| Characteristics | |
| Spectral type | G8 III[4] |
| U−B color index | +0.81[3] |
| B−V color index | +1.04[3] |
| Astrometry | |
| Radial velocity (Rv) | −13.5±0.8[5] km/s |
| Proper motion (μ) | RA: −3.845[2] mas/yr Dec.: −22.366[2] mas/yr |
| Parallax (π) | 7.4386 ± 0.2471[2] mas |
| Distance | 440 ± 10 ly (134 ± 4 pc) |
| Absolute magnitude (MV) | −0.64[1] |
| Details | |
| Mass | 3.6[6] M☉ |
| Radius | 18.4[6] R☉ |
| Luminosity | 190[6] L☉ |
| Surface gravity (log g) | 2.34[6] cgs |
| Temperature | 4,996[6] K |
| Metallicity [Fe/H] | −0.05[6] dex |
| Rotational velocity (v sin i) | 8.3[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Normae, Latinized from κ Normae, is a solitary,[9] yellow hued star in the southern constellation of Norma. Its apparent magnitude is 4.94,[3] which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 7.44 mas as seen from Earth,[10] the system is located about 440 light years from the Sun. It is drifting closer with a radial velocity of 13.5 km/s.[5]
This is an evolved giant star with a stellar classification of G8III[4] that has swollen and cooled off the main sequence. At present it has 18 times the radius of the Sun. It shines with a luminosity approximately 190 times that of the Sun and has an effective temperature of 4,996 K.[6]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Lodén, L. O.; Nordström, B. (1969), "Photometric standard sequences in Norma iII = 320° − 340°", Arkiv för Astronomi 5: 231–239, Bibcode: 1969ArA.....5..231L.
- ↑ 4.0 4.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1975mcts.book.....H.
- ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy and Astrophysics 657: A87. doi:10.1051/0004-6361/202040078. Bibcode: 2022A&A...657A..87O.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ "kap Nor". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+Nor.
- ↑ 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.
- ↑ 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.
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