Astronomy:ZZ Canis Minoris

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Short description: Symbiotic binary
ZZ Canis Minoris
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: −4.224[1] mas/yr
Parallax (π)0.7644 ± 0.0516[1] mas
Distance4,050+310
−260 ly
(1,241+94
−80 pc)
Details
Red giant
Mass1.8–2.4±0.4[3] M☉
Radius231±16[3] R☉
Luminosity5,350±750[3] L☉
Temperature3,131±69[4] K
White dwarf
Mass1?[3] M☉
Other designations
ZZ CMi, BD+09°1633, HIP 35915, IRAS 07214+0859[5]
Database references
SIMBADdata

ZZ Canis Minoris is a symbiotic binary[6] 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.[6] It does not show any silicon oxide (SiO) masers,[7] nor an infrared excess that would identify it as a dusty symbiotic binary.[8] The orbital period of the system is tentatively inferred to be 983 days.[3]

A light curve for ZZ Canis Minoris, plotted from ASAS data[9]

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.[10] 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.[4] It is on the asymptotic giant branch stage of its evolution, and is likely filling its roche lobe.[3]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Boffin, Henri M. J.; Merc, Jaroslav (2025-08-02). "Revisiting symbiotic binaries with interferometry: II. New PIONIER data". Astronomy and Astrophysics. doi:10.1051/0004-6361/202556135. 
  4. ↑ 4.0 4.1 van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary et al. (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. doi:10.3847/1538-4357/ac1687. ISSN 0004-637X. Bibcode: 2021ApJ...922..163V.  ZZ Canis Minoris' database entry at VizieR.
  5. ↑ "ZZ CMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ZZ+CMi. 
  6. ↑ 6.0 6.1 Luna, G. J. M.; Sokoloski, J. L.; Mukai, K.; Nelson, T. (November 2013). "Symbiotic stars in X-rays". Astronomy & Astrophysics 559: A6. doi:10.1051/0004-6361/201220792. ISSN 0004-6361. Bibcode: 2013A&A...559A...6L. 
  7. ↑ 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. doi:10.1088/0004-637x/719/1/126. ISSN 0004-637X. Bibcode: 2010ApJ...719..126C. 
  8. ↑ Bopp, B. W. (1984-11-01). "ZZ Canis Minoris as a symbiotic star" (in en). Publications of the Astronomical Society of the Pacific 96 (585): 894. doi:10.1086/131451. ISSN 1538-3873. Bibcode: 1984PASP...96..894B. 
  9. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. http://www.astrouw.edu.pl/asas/?page=aasc. 
  10. ↑ "ZZ CMi". https://www.aavso.org/vsx/index.php?view=detail.top&oid=5568. 
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