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27 Cancri

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Star in the constellation Cancer
27 Cancri

A light curve for 27 Cancri, plotted from Hipparcos data
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08 26 43.94035
Declination +12° 39′ 16.6066″
Apparent magnitude (V) +5.56
Characteristics
Evolutionary stage Asymptotic giant branch
Spectral type M3 IIIa
B−V color index 1.608±0.002
Variable type SRb
Astrometry
Radial velocity (Rv)−8.30±0.31 km/s
Proper motion (μ) RA: −19.760 mas/yr
Dec.: −104.664 mas/yr
Parallax (π)3.3094 ± 0.3176 mas
Distance990 ± 90 ly
(300 ± 30 pc)
Absolute magnitude (MV)−1.62
Details
Radius119 R☉
Luminosity2,455+707
−550 L☉
Surface gravity (log g)1.00 cgs
Temperature3,574 K
Metallicity 0.00 dex
Other designations
27 Cnc, BP Cancri, BD+13°1912, FK5 2658, GC 11525, HD 71250, HIP 41400, HR 3319, SAO 97819
Database references
SIMBADdata

27 Cancri is a single star in the zodiac constellation of Cancer, located around 990 light-years away from the Sun. It is visible to the naked eye as a faint, red-hued star with a typical apparent visual magnitude of around +5.56. The star is moving closer to the Earth with a heliocentric radial velocity of −8.3 km/s. It is a member of the Arcturus stream, a group of stars with high proper motion and metal-poor properties thought to be the remnants of a small galaxy consumed by the Milky Way.

The variability of the brightness of 27 Cancri was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory. It was given its variable star designation, BP Cancri, in 1977.

This is an aging red giant with a stellar classification of M3 IIIa, currently on the asymptotic giant branch. It is classified as a semiregular variable star of type SRb and its brightness varies from magnitude +5.41 to +5.75 with a period of 40 days. The star is radiating around 2,455 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,574 K.

References

  1. EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997HIP...C......0E. ISBN 9290923997. Retrieved 7 December 2024.
  2. ^ 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.
  3. ^ 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.
  4. ^ Lebzelter, T.; Hron, J. (December 2003), "Technetium and the third dredge up in AGB stars. I. Field stars", Astronomy and Astrophysics, 411 (3): 533–542, arXiv:astro-ph/0310018, Bibcode:2003A&A...411..533L, doi:10.1051/0004-6361:20031458, S2CID 18879265.
  5. ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.
  6. ^ 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.
  7. ^ Maas, Z. G.; et al. (December 2016), "Chlorine Abundances in Cool Stars", The Astronomical Journal, 152 (6): 14, arXiv:1609.01626, Bibcode:2016AJ....152..196M, doi:10.3847/0004-6256/152/6/196, S2CID 118722950, 196.
  8. "27 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-26.
  9. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. Eggen, Olin (1971), "The Arcturus Group", Publications of the Astronomical Society of the Pacific, 83 (493): 271–85, Bibcode:1971PASP...83..271E, doi:10.1086/129120.
  11. Stebbins, Joel; Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". Publications of the Washburn Observatory. 15: 137–174. Bibcode:1928PWasO..15..137S. Retrieved 5 December 2024.
  12. Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 834: 1–22. Bibcode:1973IBVS..834....1K. Retrieved 8 December 2024.
  13. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
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