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S Canis Minoris

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Variable star in the constellation Canis Minor
S Canis Minoris

The visual band light curve of S Canis Minoris, from AAVSO data
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Minor
Right ascension 07 32 43.06942
Declination 08° 19′ 05.1975″
Apparent magnitude (V) 6.5 to 13.7
Characteristics
Evolutionary stage AGB
Spectral type M7-8e
B−V color index 1.50±0.51
Variable type Mira variable
Astrometry
Radial velocity (Rv)68.0±4.8 km/s
Proper motion (μ) RA: −10.785 mas/yr
Dec.: −12.827 mas/yr
Parallax (π)2.3934 ± 0.0982 mas
Distance1,532 ly
(470 pc)
Details
Radius300 R☉
Luminosity5,000 L☉
Surface gravity (log g)−0.55 cgs
Temperature2,800 K
Metallicity +0.39 dex
Other designations
S CMi, BD+08°1800, HD 59950, HIP 36675, SAO 115591
Database references
SIMBADdata

S Canis Minoris is a variable star in the equatorial constellation Canis Minor. It has a peak apparent visual magnitude of 6.5, so not normally visible to the naked eye. The star is located at a distance of approximately 1,530 light-years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of about +68 km/s.

In 1856, John Russell Hind discovered that S Canis Minoris is a variable star. This is an aging red giant star with a stellar classification of M7-8e, where the 'e' suffix indicates emission lines in the spectrum. It is a Mira-type long period variable that varies by an amplitude of 4.27 in visual magnitude over a period of 327.77±2.78 d. Evidence has been found of asymmetry in this star, suggesting a non-spherical shape. Abundance-wise, it is an oxygen-rich giant and the emission feature is of the oxygen-rich silicate class as it sheds silicate dust from its atmosphere. The star is shedding mass at the rate of 4.9×10 M☉·yr.

Notes

  1. Radius calculated with temperature and luminosity

References

  1. "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 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.
  4. ^ 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.
  5. ^ Danilovich, T.; et al. (September 2015). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme". Astronomy & Astrophysics. 581: 33. arXiv:1506.09065. Bibcode:2015A&A...581A..60D. doi:10.1051/0004-6361/201526705. S2CID 55109956. A60.
  6. ^ Keenan, Philip C.; et al. (1974). "Revised Catalog of Spectra of Mira Variables of Types ME and Se". The Astrophysical Journal Supplement Series. 28: 271. Bibcode:1974ApJS...28..271K. doi:10.1086/190318.
  7. 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.
  8. ^ Garfinkle, Robert A. (1997). Star-hopping: your Visa to Viewing the Universe. Cambridge, United Kingdom: Cambridge University Press. pp. 78–81. ISBN 978-0-521-59889-7.
  9. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  10. ^ Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
  11. "S CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-13.
  12. Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 4 January 2025.
  13. Vogt, N.; Contreras-Quijada, A.; Fuentes-Morales, I.; Vogt-Geisse, S.; Arcos, C.; Abarca, C.; Agurto-Gangas, C.; Caviedes, M.; DaSilva, H.; Flores, J.; Gotta, V.; Peñaloza, F.; Rojas, K.; Villaseñor, J. I. (November 2016). "Determination of Pulsation Periods and Other Parameters of 2875 Stars Classified as MIRA in the All Sky Automated Survey (ASAS)". The Astrophysical Journal Supplement Series. 227 (1): 13. arXiv:1609.05246. Bibcode:2016ApJS..227....6V. doi:10.3847/0067-0049/227/1/6. S2CID 119295645. 6.
  14. Winters, J. M.; et al. (October 2003). "Mass-loss from dusty, low outflow-velocity AGB stars. I. Wind structure and mass-loss rates". Astronomy and Astrophysics. 409 (2): 715–735. Bibcode:2003A&A...409..715W. doi:10.1051/0004-6361:20031110.
  15. Sloan, G. C.; Price, S. D. (December 1998). "The Infrared Spectral Classification of Oxygen-rich Dust Shells". The Astrophysical Journal Supplement Series. 119 (2): 141–158. Bibcode:1998ApJS..119..141S. doi:10.1086/313156.
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