Astronomy:R Cancri
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Short description: Variable star in the constellation Cancer
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 16m 33.82673s[2] |
| Declination | +11° 43′ 34.4691″[2] |
| Apparent magnitude (V) | 6.07 - 12.3[3] |
| Characteristics | |
| Spectral type | M6e-M9e[3] |
| U−B color index | 0.49[4] |
| B−V color index | 1.53[4] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | 35.42 ± 0.52[5] km/s |
| Proper motion (μ) | RA: 0.635±0.195[2] mas/yr Dec.: −10.785±0.106[2] mas/yr |
| Parallax (π) | 3.9375 ± 0.1792[2] mas |
| Distance | 854+36 −39 ly (262+11 −12 pc) |
| Details | |
| Mass | 1.43[6] M☉ |
| Radius | 371±37[7] R☉ |
| Luminosity | 5,700[7][lower-alpha 1] L☉ |
| Surface gravity (log g) | −0.69[6] cgs |
| Temperature | 2,604±300[7] K |
| Metallicity [Fe/H] | +0.22[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
R Cancri is a Mira variable in the constellation Cancer. Located approximately 250 parsecs (830 ly) distant, it varies between magnitudes 6.07 and 12.3 over a period of approximately 357 days.[3] At its brightest, it is very faintly visible to the naked eye.
Friedrich Magnus Schwerd discovered R Cancri in 1829.[8] It was one of the first variable stars to be discovered.[9]
Notes
- ↑ Calculated using the given radius and temperature by the Stefan-Boltzmann law.
References
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
- ↑ 2.0 2.1 2.2 2.3 2.4 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. Gaia EDR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 "R Cancri". American Association of Variable Star Observers. 7 January 2011. http://www.aavso.org/vsx/index.php?view=detail.top&oid=4805.
- ↑ 4.0 4.1 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode: 2002yCat.2237....0D.
- ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy and Astrophysics 430 (165): 165–186. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F.
- ↑ 6.0 6.1 6.2 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardèvol, J.; Casamiquela, L.; Figueras, F.; Jiménez-Arranz, Ó. et al. (2022-02-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy and Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. Database at VizieR.
- ↑ 7.0 7.1 7.2 Karovicova, I.; Wittkowski, M.; Ohnaka, K.; Boboltz, D. A.; Fossat, E.; Scholz, M. (2013-12-01). "New insights into the dust formation of oxygen-rich AGB stars" (in en). Astronomy & Astrophysics 560: A75. doi:10.1051/0004-6361/201322376. ISSN 0004-6361. Bibcode: 2013A&A...560A..75K. https://www.aanda.org/articles/aa/abs/2013/12/aa22376-13/aa22376-13.html.
- ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory 55: 1–94. Bibcode: 1907AnHar..55....1C. https://articles.adsabs.harvard.edu/pdf/1907AnHar..55....1C. Retrieved 20 December 2024.
- ↑ "The First Known Variable Stars". Students for the Exploration and Development of Space. https://spider.seds.org/spider/Vars/vars.html.
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