49 Cancri

49 Cancri is a single star[10] in the zodiac constellation of Cancer, located 516 light years away from the Sun. It has the Bayer designation b Cancri; 49 Cancri is the Flamsteed designation. It is visible to the naked eye as a faint star with an apparent visual magnitude of about 5.6. It is moving away from the Earth with a heliocentric radial velocity of +27.5 km/s.

49 Cancri
Location of 49 Cancri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension  08h 44m 45.03608s[1]
Declination +10° 04′ 54.0035″[1]
Apparent magnitude (V) 5.58 - 5.71[2]
Characteristics
Evolutionary stage Main sequence
Spectral type A1VpHgMnSiEu[3]
B−V color index −0.069[4]
Variable type α2 CVn[2]
Astrometry
Radial velocity (Rv)+27.50[5] km/s
Proper motion (μ) RA: −15.045[1] mas/yr
Dec.: −18.234[1] mas/yr
Parallax (π)6.3266 ± 0.1034[1] mas
Distance516 ± 8 ly
(158 ± 3 pc)
Absolute magnitude (MV)+0.07[4]
Details
Mass3.011[6] M☉
Radius2.909[6] R☉
Luminosity102[7] L☉
Surface gravity (log g)3.964[6] cgs
Temperature10,615[6] K
Metallicity [Fe/H]+0.013[6] dex
Rotational velocity (v sin i)21[7] km/s
Age263[8] Myr
Other designations
b Cnc, 49 Cnc, BI Cnc, BD+10°1864, FK5 2688, HD 74521, HIP 42917, HR 3465, SAO 98089[9]
Database references
SIMBADdata

49 Cancri is a variable star. Its brightness changes from magnitude 5.58 to 5.71 every seven days. It is classified as an α2 Canum Venaticorum variable, a class of magnetic chemically peculiar stars. The brightness changes are thought to correspond to the rotation of the star. 49 Cancri is classified from its spectrum as an Ap star, with enhanced lines of silicon, europium, and chromium.[11] Additionally, calcium and magnesium lines are described as weaker than normal.[3]

49 Cancri is classified as an A1 main sequence star.[3] It has three times the mass of the Sun, an effective temperature of 10,615 K, and a radius of 2.9 R☉.[6] It radiates about a hundred times the luminosity of the Sun due to its high temperature and large size.[7]

References
  1. 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.
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  3. Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. 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.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. Huber, Daniel; Bryson, Stephen T.; Haas, Michael R.; Barclay, Thomas; Barentsen, Geert; Howell, Steve B.; Sharma, Sanjib; Stello, Dennis; Thompson, Susan E. (2016). "The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8". The Astrophysical Journal Supplement Series. 224 (1): 2. arXiv:1512.02643. Bibcode:2016ApJS..224....2H. doi:10.3847/0067-0049/224/1/2.
  7. Netopil, Martin; Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus (2017). "An investigation of the rotational properties of magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 468 (3): 2745. arXiv:1703.05218. Bibcode:2017MNRAS.468.2745N. doi:10.1093/mnras/stx674.
  8. Kochukhov, O.; Bagnulo, S. (2006). "Evolutionary state of magnetic chemically peculiar stars". Astronomy and Astrophysics. 450 (2): 763. arXiv:astro-ph/0601461. Bibcode:2006A&A...450..763K. doi:10.1051/0004-6361:20054596.
  9. "49 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-29.
  10. 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.
  11. Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars" (PDF). Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
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