Astronomy:27 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 26m 43.94035s[2] |
| Declination | +12° 39′ 16.6066″[2] |
| Apparent magnitude (V) | +5.56[3] |
| Characteristics | |
| Evolutionary stage | Asymptotic giant branch[4] |
| Spectral type | M3 IIIa[5] |
| B−V color index | 1.608±0.002[3] |
| Variable type | SRb[4] |
| Astrometry | |
| Radial velocity (Rv) | −8.30±0.31[6] km/s |
| Proper motion (μ) | RA: −19.760[2] mas/yr Dec.: −104.664[2] mas/yr |
| Parallax (π) | 3.3094 ± 0.3176[2] mas |
| Distance | 990 ± 90 ly (300 ± 30 pc) |
| Absolute magnitude (MV) | −1.62[3] |
| Details | |
| Radius | 119[2] R☉ |
| Luminosity | 2,455+707 −550[7] L☉ |
| Surface gravity (log g) | 1.00[7] cgs |
| Temperature | 3,574[7] K |
| Metallicity [Fe/H] | 0.00[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
27 Cancri is a single[9] star in the zodiac constellation of Cancer, located around 990 light-years away from the Sun.[2] It is visible to the naked eye as a faint, red-hued star with a typical apparent visual magnitude of around +5.56.[3] The star is moving closer to the Earth with a heliocentric radial velocity of −8.3 km/s.[6] 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.[10]
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.[11] It was given its variable star designation, BP Cancri, in 1977.[12]
This is an aging red giant with a stellar classification of M3 IIIa,[5] currently on the asymptotic giant branch.[4] 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.[13] The star is radiating around 2,455[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,574 K.[7]
References
- ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series (Noordwijk, Netherlands: ESA Publications Division) 1200. ISBN 9290923997. Bibcode: 1997HIP...C......0E. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. Retrieved 7 December 2024.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 4.2 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, doi:10.1051/0004-6361:20031458, Bibcode: 2003A&A...411..533L.
- ↑ 5.0 5.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 6.0 6.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Maas, Z. G. et al. (December 2016), "Chlorine Abundances in Cool Stars", The Astronomical Journal 152 (6): 14, doi:10.3847/0004-6256/152/6/196, 196, Bibcode: 2016AJ....152..196M.
- ↑ "27 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=27+Cnc.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Eggen, Olin (1971), "The Arcturus Group", Publications of the Astronomical Society of the Pacific 83 (493): 271–85, doi:10.1086/129120, Bibcode: 1971PASP...83..271E.
- ↑ 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. https://articles.adsabs.harvard.edu/pdf/1928PWasO..15..137S. Retrieved 5 December 2024.
- ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars". Information Bulletin on Variable Stars 834: 1–22. Bibcode: 1973IBVS..834....1K. https://ibvs.konkoly.hu/pub/ibvs/0801/0834.pdf. Retrieved 8 December 2024.
- ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
 |  |
