50 Cancri is a single[9] star in the zodiac constellation of Cancer, located 183 light years away from the Sun.[1] It has the Bayer designation A2 Cancri; 50 Cancri is the Flamsteed designation. It is faintly visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.89.[2] The star is moving away from the Earth with a heliocentric radial velocity of 23 km/s, having come to within 118 light-years some 1.2 million years ago.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 46m 56.01919s[1] |
| Declination | +12° 06′ 35.8305″[1] |
| Apparent magnitude (V) | 5.89[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1 Vp[3] |
| B−V color index | 0.120±0.005[2] |
| Variable type | None[4] |
| Astrometry | |
| Radial velocity (Rv) | 23.3±2.9[2] km/s |
| Proper motion (μ) | RA: −63.773[1] mas/yr Dec.: −50.694[1] mas/yr |
| Parallax (π) | 17.7961 ± 0.0792 mas[1] |
| Distance | 183.3 ± 0.8 ly (56.2 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.82±0.01[4] |
| Details | |
| Mass | 2.1[5] M☉ |
| Luminosity | 10.8±0.21[5] L☉ |
| Surface gravity (log g) | 4.40[6] cgs |
| Temperature | 8,340±48[5] K |
| Rotational velocity (v sin i) | 18[7] km/s |
| Age | 264[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a chemically peculiar A-type main-sequence star with a stellar classification of A1 Vp.[3] It is a Lambda Boötis star displaying strongly-depleted iron peak and alpha process elements, but otherwise relatively normal solar abundances.[5] The star shows no variability down to a detection limit of 1.6 millimagnitudes.[10] It is 264[6] million years old with a relatively low projected rotational velocity of 18 km/s.[7] 50 Cancri has 2.1[5] times the mass of the Sun and is radiating 11[5] times the Sun's luminosity from its photosphere at an effective temperature of 8,340 K.[5]
50 Cancri has an infrared excess, which most likely indicates a debris disk in orbit around the host star. A blackbody model of the emission shows a two component fit, with the warm section having a temperature of 246±91 K at a radius of 4±3 AU from the star, and a cool component at 108±21 K with a separation of 22±8 AU.[5]
References
edit- ^ a b c d e f 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 e 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 Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
- ^ a b Paunzen, E.; et al. (November 2002), "The status of Galactic field λ Bootis stars in the post-Hipparcos era", Monthly Notices of the Royal Astronomical Society, 336 (3): 1030–1042, arXiv:astro-ph/0207488, Bibcode:2002MNRAS.336.1030P, doi:10.1046/j.1365-8711.2002.05865.x, S2CID 2389489.
- ^ a b c d e f g h Draper, Z. H.; et al. (2016), "IR excesses around nearby Lambda Boo stars are caused by debris discs rather than ISM bow waves", Monthly Notices of the Royal Astronomical Society, 456 (1): 459, arXiv:1511.05919, Bibcode:2016MNRAS.456..459D, doi:10.1093/mnras/stv2696, S2CID 118343020.
- ^ a b c 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 Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ "50 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-06.
- ^ De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932, S2CID 88503488.
- ^ Paunzen, E.; et al. (September 2002), "On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of lambda Bootis type stars", Astronomy and Astrophysics, 392 (2): 515–528, arXiv:astro-ph/0207494, Bibcode:2002A&A...392..515P, doi:10.1051/0004-6361:20020854, S2CID 54666586.