| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 01m 48.83393s [1] |
| Declination | +27° 54′ 09.3505″ [1] |
| Apparent magnitude (V) | 6.07 [2] (6.08 + 9.22) [3] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A8 Vn [4] |
| B−V color index | 0.243±0.008 [2] |
| Astrometry | |
| Radial velocity (Rv) | +12.0±4.3 [5] km/s |
| Proper motion (μ) |
RA: −57.037
[1]
mas/
yr Dec.: −80.127 [1] mas/ yr |
| Parallax (π) | 16.7647 ± 0.1550 mas [1] |
| Distance | 195 ± 2
ly (59.6 ± 0.6 pc) |
| Absolute magnitude (MV) | 2.25 [2] |
| Details | |
| 67 Cnc A | |
| Mass | 1.89 [6] M☉ |
| Radius | 1.90+0.07 −0.14 [1] R☉ |
| Luminosity | 10.465+0.111 −0.112 [1] L☉ |
| Surface gravity (log g) | 4.35 [6] cgs |
| Temperature | 7,982±271 [6] K |
| Rotational velocity (v sin i) | 105 [7] km/s |
| Age | 867 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
67 Cancri is a wide binary star [9] system in the zodiac constellation of Cancer, located 195 [1] light years away from the Sun. It is just visible to the naked eye as a faint, white-hued star with a combined apparent magnitude of 6.07. [2] The binary nature of this system was discovered by James South and John Herschel. [3] As of 2007, the two components have an angular separation of 103.9 ″, corresponding to a projected separation of 6,100 AU. [9] They are moving further from the Earth with a heliocentric radial velocity of +12 km/s. [5]
The primary, designated component A, is an A-type main-sequence star with a stellar classification of A8 Vn. [4] The 'n' notation indicates "nebulous" lines due to rapid rotation. It is a shell star, [10] with weak shell lines of singly-ionized titanium being detected in the near ultraviolet in 1970. These may have come from a sporadic mass loss event. [11] Uesugi and Fukuda (1970) gave a projected rotational velocity estimate of 105 [7] km/s for the star, although Abt et al. (1997) suggested it could be as high as 205 km/s. [11]
67 Cancri A is about 867 [6] million years old with 1.89 [6] times the mass of the Sun and 1.90 [1] times the Sun's radius. It is radiating 10.5 [1] times the Sun's luminosity from its photosphere at an effective temperature of 7,982 K. [6]
References
- ^ a b c d e f g h i j Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d 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 Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode: 1969AJ.....74..375C, doi: 10.1086/110819.
- ^ 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 c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154, Bibcode: 2015ApJ...804..146D, doi: 10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b 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.
- ^ "67 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-09.
- ^ a b Trilling, D. E.; et al. (April 2007), "Debris disks in main-sequence binary systems", The Astrophysical Journal, 658 (2): 1264–1288, arXiv: astro-ph/0612029, Bibcode: 2007ApJ...658.1289T, doi: 10.1086/511668, S2CID 14867168.
- ^ Hauck, B.; Jaschek, C. (2000), "A-shell stars in the Geneva system", Astronomy and Astrophysics, 354: 157, Bibcode: 2000A&A...354..157H.
- ^ a b Abt, Helmut A.; et al. (September 1997), "Hot Inner Disks that Appear and Disappear Around Rapidly Rotating A-Type Dwarfs", The Astrophysical Journal, 487 (1): 365–369, Bibcode: 1997ApJ...487..365A, doi: 10.1086/304603.
