ZZ Canis Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Minor |
| Right ascension | 07h 24m 13.9974s[1] |
| Declination | +08° 53′ 51.787″[1] |
| Apparent magnitude (V) | 9.7 - 10.6[2] |
| Characteristics | |
| Red giant | |
| Evolutionary stage | AGB[3] |
| Spectral type | M4-M6 III[3] |
| Variable type | SRc[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.89±0.55[1] km/s |
| Proper motion (μ) | RA: −0.202 mas/yr[1] Dec.: −4.224 mas/yr[1] |
| Parallax (π) | 0.7644±0.0516 mas[1] |
| Distance | 4,050+310 −260 ly (1,241+94 −80 pc)[4] |
| Details | |
| Red giant | |
| Mass | 1.8–2.4±0.4[3] M☉ |
| Radius | 231±16[3] R☉ |
| Luminosity | 5,350±750[3] L☉ |
| Temperature | 3,131±69[5] K |
| White dwarf | |
| Mass | 1?[3] M☉ |
| Other designations | |
| ZZ CMi, BD+09°1633, HIP 35915, TIC 453173127, IRAS 07214+0859[6] | |
| Database references | |
| SIMBAD | data |
ZZ Canis Minoris is a symbiotic binary[7] in the constellation Canis Minor. It is 4,000 light-years distant and is not visible 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 orbital period of the system is tentatively inferred to be 983 days.[3]
The red giant primary is a semiregular variable, with an apparent magnitude that varies from 9.7 to 10.6[2] over an uncertain period, values of 106[2] and 437 days have been published.[11] It has over 230 times the Sun's radius and is 5,350 times as luminous,[3] radiating this energy from a cool, 3,200 K photosphere.[5] It is on the asymptotic giant branch stage of its evolution, and is likely filling its roche lobe.[3]
References
- ^ 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.
- ^ a b c d 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.
- ^ a b c d e f g h i Boffin, Henri M. J.; Merc, Jaroslav (2025-08-02). "Revisiting symbiotic binaries with interferometry: II. New PIONIER data". Astronomy and Astrophysics. arXiv:2508.01304.
- ^ 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.
- ^ 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.
- ^ "ZZ CMi". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 4 March 2025.
- ^ "ZZ CMi". International Variable Star Index. Retrieved 2025-03-03.
