Astronomy:Kappa Cancri
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 09h 07m 44.80955s[2] |
| Declination | +10° 40′ 05.5196″[2] |
| Apparent magnitude (V) | +5.233[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | B8 IIIp[4] |
| B−V color index | −0.113[3] |
| Variable type | α2 CVn[5] |
| Astrometry | |
| Radial velocity (Rv) | 24.5±0.8[6] km/s |
| Proper motion (μ) | RA: −18.31[2][2] mas/yr Dec.: −12.105[2] mas/yr |
| Parallax (π) | 5.3209 ± 0.1298[2] mas |
| Distance | 610 ± 10 ly (188 ± 5 pc) |
| Absolute magnitude (MV) | −0.82[1] |
| Orbit[7] | |
| Period (P) | 6.3933 d |
| Eccentricity (e) | 0.13 |
| Periastron epoch (T) | 2440001.95 JD |
| Argument of periastron (ω) (secondary) | 157° |
| Semi-amplitude (K1) (primary) | 67.4 km/s |
| Details[8] | |
| κ Cnc A | |
| Mass | 4.5 M☉ |
| Radius | 5.0 R☉ |
| Luminosity | 322[1] L☉ |
| Surface gravity (log g) | 3.7±0.1[3] cgs |
| Temperature | 12,800±200[3] K |
| Metallicity [Fe/H] | +0.51[1] dex |
| Rotational velocity (v sin i) | 6±2[3] km/s |
| κ Cnc B | |
| Mass | 2.1 M☉ |
| Radius | 2.4 R☉ |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 8,500 K |
| Rotational velocity (v sin i) | 40 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Cancri is a blue-white hued binary star system in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from κ Cancri, and abbreviated Kappa Cnc or κ Cnc. This system is faintly visible to the naked eye as a star with an apparent visual magnitude of +5.23.[3] The magnitude difference between the two stars is about 2.6.[10] Based upon an annual parallax shift of 5.32 mas as seen from the Earth,[2] the system is located approximately 610 light-years distant from the Sun. It is drifting further away with a line of sight velocity of 25 km/s.[6] The position of this system near the ecliptic means it is subject to lunar occultation.[11]
This is a single-lined spectroscopic binary[3] star system with an orbital period of 6.39 days and an eccentricity of 0.13.[7] The primary, component A, has a stellar classification of B8 IIIp,[4] suggesting it is a B-type giant star. This a mercury-manganese star, a type of chemically peculiar star showing large overabundances of those two elements in the outer atmosphere. This indicates that it is instead a main sequence star.[3][10] It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies from magnitude +5.22 to +5.27 with a period of five days.[5]
The primary component has 4.5 times the mass of the Sun, five times the Sun's radius, and an effective temperature of 13,200 K. The secondary, component B, is a smaller star with 2.1 times the mass and 2.4 times the radius of the Sun, having an effective temperature of 8,500 K.[8]
References
- ↑ 1.0 1.1 1.2 1.3 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 2.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. 592021045155272832 Gaia EDR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Maza, Natalia L. et al. (December 2014), "A non-LTE spectral analysis of the 3He and 4He isotopes in the HgMn star κ Cancri", Astronomy & Astrophysics 572: 7, doi:10.1051/0004-6361/201425037, A112, Bibcode: 2014A&A...572A.112M.
- ↑ 4.0 4.1 Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics 19: 91, Bibcode: 1975A&AS...19...91L.
- ↑ 5.0 5.1 Samus', N. N. et al. (January 2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 6.0 6.1 Gontcharov, G. A. (2006), "Pulkovo compilation of radial velocities for 35495 stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 Pourbaix, D. et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics 424 (2): 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ 8.0 8.1 Ryabchikova, T. (April 1998), "Abundance analysis of SB2 binary stars with HgMn primaries", Contributions of the Astronomical Observatory Skalnate Pleso 27 (3): 319–323, Bibcode: 1998CoSka..27..319R.
- ↑ "kap Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+Cnc.
- ↑ 10.0 10.1 Ryabchikova, T. et al. (April 1998), "Discovery of the secondary star of the HgMn binary kappa CANCRI", Contributions of the Astronomical Observatory Skalnate Pleso 27 (3): 258–260, Bibcode: 1998CoSka..27..258R.
- ↑ Herr, Richard B. (April 1969), "Identification List of Spectroscopic and Eclipsing Binaries Subject to Occultations by the Moon", Publications of the Astronomical Society of the Pacific 81 (479): 105, doi:10.1086/128748, Bibcode: 1969PASP...81..105H.
- ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 5 December 2022.
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