ZZ Canis Minoris is a symbiotic binary[7] in the constellation Canis Minor. It is 4,000 light-years distant and can't be seen to the naked eye with a maximum apparent magnitude of +9.7.

This binary system is made up of a red giant primary and a white dwarf secondary that is accreting material from the red giant. The accretion disk around the white dwarf and the collision of both components' stellar winds create X-ray emission.[7] It does not show any silicon oxide (SiO) masers,[8] nor an infrared excess that would identify it as a dusty symbiotic binary.[9]

The red giant primary is a semiregular variable, with an apparent magnitude that varies from 9.7 to 10.2 over a 500-day period.[3] Periods of 106 days[2] and 437 days have also been published.[10] It has over 200 times the Sun's radius and is 3,600 times as luminous, radiating this energy from a cool, 3,200 K photosphere.[5] Its stellar spectrum match a spectral type M6 I-IIep, indicating it is a M-type star, between the supergiant and bright giant stages and show emission lines in its spectrum, as well as peculiarities in chemical composition.[3]

References

  1. ^ a b c d e 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.
  2. ^ a b c Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  3. ^ a b c Taranova, O. G.; Shenavrin, V. I. (2001-05-01). "Infrared Photometry of Five Long-Period Binaries". Astronomy Letters. 27 (5): 338–344. Bibcode:2001AstL...27..338T. doi:10.1134/1.1368704. ISSN 1063-7737.
  4. ^ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
  5. ^ a b van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary; van Belle, Gerald; Bucknew, William; Cole, Gary (2021-12-01). "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color". The Astrophysical Journal. 922 (2): 163. arXiv:2107.09205. Bibcode:2021ApJ...922..163V. doi:10.3847/1538-4357/ac1687. ISSN 0004-637X. ZZ Canis Minoris' database entry at VizieR.
  6. ^ "ZZ CMi". SIMBAD. Centre de données astronomiques de Strasbourg.
  7. ^ a b Luna, G. J. M.; Sokoloski, J. L.; Mukai, K.; Nelson, T. (November 2013). "Symbiotic stars in X-rays". Astronomy & Astrophysics. 559: A6. arXiv:1211.6082. Bibcode:2013A&A...559A...6L. doi:10.1051/0004-6361/201220792. ISSN 0004-6361.
  8. ^ Cho, Se-Hyung; Kim, Jaeheon (2010-07-16). "SIMULTANEOUS OBSERVATIONS OF SiO AND H2O MASERS TOWARD SYMBIOTIC STARS". The Astrophysical Journal. 719 (1): 126–130. Bibcode:2010ApJ...719..126C. doi:10.1088/0004-637x/719/1/126. ISSN 0004-637X.
  9. ^ Bopp, B. W. (1984-11-01). "ZZ Canis Minoris as a symbiotic star". Publications of the Astronomical Society of the Pacific. 96 (585): 894. Bibcode:1984PASP...96..894B. doi:10.1086/131451. ISSN 1538-3873.
  10. ^ "ZZ CMi". International Variable Star Index. Retrieved 2025-03-03.
Allikas: http://en.wikipedia.org/wiki/ZZ_Canis_Minoris
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