S Canis Minoris

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 1,360 light-years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of about +68 km/s.

S Canis Minoris

The visual band light curve of S Canis Minoris, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Minor
Right ascension 07h 32m 43.06942s[2]
Declination 08° 19′ 05.1975″[3]
Apparent magnitude (V) 6.5 to 13.7[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M7-8e[6]
B−V color index 1.50±0.51[7]
Variable type Mira[8][4]
Astrometry
Radial velocity (Rv)68.0±4.8[9] km/s
Proper motion (μ) RA: −10.785[2] mas/yr
Dec.: −12.827[2] mas/yr
Parallax (π)2.3934 ± 0.0982 mas[2]
Distance1,360 ± 60 ly
(420 ± 20 pc)
Details
Mass4.5[10] M☉
Radius710[11] R☉
Luminosity6,493[12] L☉
Surface gravity (log g)−0.55[10] cgs
Temperature2,813[10] K
Metallicity [Fe/H]+0.39[10] dex
Other designations
S CMi, BD+08°1800, HD 59950, HIP 36675, SAO 115591[13]
Database references
SIMBADdata

This is an aging red giant star with a stellar classification of M7-8e,[6] where the 'e' suffix indicates emission lines in the spectrum. It is a Mira-type[8] long period variable that varies by an amplitude of 4.27 in visual magnitude over a period of 327.77±2.78 d.[14] Evidence has been found of asymmetry in this star, suggesting a non-spherical shape.[5] Abundance-wise, it is an oxygen-rich[12] giant and the emission feature is of the oxygen-rich silicate class as it sheds silicate dust from its atmosphere.[15] The star is shedding mass at the rate of 4.9×10−8 M☉·yr−1.[5]

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. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  12. 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.
  13. "S CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-13.
  14. 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.
  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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