Kappa Volantis, Latinized from κ Volantis, is a quadruple star system[16] in the southern constellation of Volans. The primary component has an apparent visual magnitude of 5.37, while the secondary companion is magnitude 5.65;[2] individually, both a bright enough to be faintly visible to the naked eye. Based upon parallax measurements, the stars appear to be around 420−430 light-years from the Sun.
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Volans |
| κ1 Vol | |
| Right ascension | 08h 19m 48.96447s[1] |
| Declination | −71° 30′ 53.6692″[1] |
| Apparent magnitude (V) | 5.37[2] |
| κ2 Vol | |
| Right ascension | 08h 20m 00.52661s[1] |
| Declination | −71° 30′ 19.3664″[1] |
| Apparent magnitude (V) | 5.65[2] |
| Characteristics | |
| κ1 Vol | |
| Spectral type | B9III/IV[3] |
| U−B color index | −0.31[2] |
| B−V color index | −0.06[2] |
| κ2 Vol | |
| Spectral type | B9/A0IV[3] |
| U−B color index | −0.31[2] |
| B−V color index | −0.10[2] |
| Astrometry | |
| κ1 Vol | |
| Radial velocity (Rv) | 36.0[4] km/s |
| Proper motion (μ) | RA: −16.89[1] mas/yr Dec.: +36.26[1] mas/yr |
| Parallax (π) | 7.50 ± 0.35 mas[1] |
| Distance | 430 ± 20 ly (133 ± 6 pc) |
| Absolute magnitude (MV) | −0.29[5] |
| κ2 Vol | |
| Radial velocity (Rv) | −6.50[4] km/s |
| Proper motion (μ) | RA: −17.71[1] mas/yr Dec.: +34.10[1] mas/yr |
| Parallax (π) | 7.79 ± 0.21 mas[1] |
| Distance | 420 ± 10 ly (128 ± 3 pc) |
| Absolute magnitude (MV) | +0.09[5] |
| Details | |
| κ1 Vol | |
| Mass | 2.7±0.3[6] M☉ |
| Radius | 3.83±0.65[7] R☉ |
| Luminosity | 129[8] L☉ |
| Surface gravity (log g) | 3.77±0.09[6] cgs |
| Temperature | 9,884[8] K |
| Metallicity [Fe/H] | −0.20+0.36 −0.25[6] dex |
| Rotational velocity (v sin i) | 80[9] km/s |
| κ2 Vol | |
| Mass | 3.03[10] M☉ |
| Radius | 3.01[10] R☉ |
| Luminosity | 124[8] L☉ |
| Surface gravity (log g) | 4.19[10] cgs |
| Temperature | 11,682[8] K |
| Metallicity [Fe/H] | +0.69±0.15[11] dex |
| Rotation | 1.29641[12] d |
| Rotational velocity (v sin i) | 2[13] km/s |
| Age | 120[10] Myr |
| Other designations | |
| κ1 Vol: CPD−71°677, HD 71046, HIP 40817, HR 3301, SAO 256497[14] | |
| κ2 Vol: CPD−71° 678, HD 71066, HIP 40834, HR 3302, SAO 256499.[15] | |
| Database references | |
| SIMBAD | κ1 Vol |
| κ2 Vol | |
Properties edit
The brightest component, κ1 Volantis, is a blue-white B-type star with a stellar classification showing characteristics of a both a subgiant and giant star. It has an unseen companion, and the pair form a single-lined spectroscopic binary.[16] The star has nearly three times the Sun's mass, and 3.8 times its radius. It radiates at 129 times the Sun's luminosity from its photosphere at an effective temperature of 9,884 K.
Companion edit
Separated from κ1 Volantis by 65 arcseconds, κ2 Volantis is a white subgiant star that falls between a B-type and A-type classification. The system's fourth component, κ Volantis C, is a magnitude +8.5 star 37.7 arcseconds away from κ2 Volantis.
References edit
- ^ a b c d e f g h i j 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 e f g Johnson, H. L.; et al. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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.
- ^ a b c Anders, F.; et al. (1 August 2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy and Astrophysics, 628: A94, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765, ISSN 0004-6361, S2CID 131780028.
- ^ Stassun, Keivan G.; et al. (1 September 2018), "The TESS Input Catalog and Candidate Target List", The Astronomical Journal, 156 (3): 102, arXiv:1706.00495, Bibcode:2018AJ....156..102S, doi:10.3847/1538-3881/aad050, ISSN 0004-6256, S2CID 73582386.
- ^ a b c d 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, S2CID 118665352.
- ^ Glebocki, R.; Gnacinski, P. (1 March 2005), "Systematic errors in the determination of stellar rotational velocities", 13th Cambridge Workshop on Cool Stars, 560: 571, Bibcode:2005ESASP.560..571G.
- ^ a b c d Glagolevskij, Yu. V. (1 January 2019), "On Properties of Main Sequence Magnetic Stars", Astrophysical Bulletin, 74 (1): 66–79, Bibcode:2019AstBu..74...66G, doi:10.1134/S1990341319010073, S2CID 149900274.
- ^ Ghazaryan, S.; Alecian, G.; Hakobyan, A. A. (1 November 2018), "New catalogue of chemically peculiar stars, and statistical analysis", Monthly Notices of the Royal Astronomical Society, 480 (3): 2953–2962, arXiv:1807.06902, Bibcode:2018MNRAS.480.2953G, doi:10.1093/mnras/sty1912, ISSN 0035-8711.
- ^ Barraza, L. F.; Gomes, R. L.; Messias, Y. S.; Leão, I. C.; Almeida, L. A.; Janot-Pacheco, E.; Brito, A. C.; Brito, F. A. C.; Santana, J. V.; Gonçalves, N. S.; Das Chagas, M. L.; Teixeira, M. A.; De Medeiros, J. R.; Canto Martins, B. L. (2022). "Rotation Signature of TESS B-type Stars. A Comprehensive Analysis". The Astrophysical Journal. 924 (2): 117. arXiv:2202.01022. Bibcode:2022ApJ...924..117B. doi:10.3847/1538-4357/ac3335. S2CID 246030494.
- ^ Hubrig, S.; Castelli, F.; Wahlgren, G. M. (1 June 1999), "Search for magnetic fields in HgMn stars by using relative strengths of multiplet 74 Fe II lines", Astronomy and Astrophysics, 346: 139–145, Bibcode:1999A&A...346..139H, ISSN 0004-6361.
- ^ a b "kap01 Vol -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-05.
- ^ "kap02 Vol -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-05.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.