Astronomy:1 Canis Minoris

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Short description: Star in the constellation Canis Minor
1 Canis Minoris
Location of 1 Canis Minoris (circled in red)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Canis Minor
Right ascension  07h 24m 58.18002s[1]
Declination +11° 40′ 10.2825″[1]
Apparent magnitude (V) 5.37[2]
Characteristics
Evolutionary stage main sequence[1][3]
Spectral type A5 IV[4] or A4 V[5]
B−V color index 0.105±0.006[2]
Astrometry
Radial velocity (Rv)−1.0±4.2[2] km/s
Proper motion (μ) RA: −15.574[1] mas/yr
Dec.: −15.478[1] mas/yr
Parallax (π)10.9796 ± 0.0959[1] mas
Distance297 ± 3 ly
(91.1 ± 0.8 pc)
Absolute magnitude (MV)0.44[2]
Details
Mass2.02[6] M☉
Radius3.28[6] R☉
Luminosity44[6] L☉
Surface gravity (log g)3.71[6] cgs
Temperature8,222[6] K
Rotational velocity (v sin i)159[3] km/s
Age716[7] Myr
Other designations
1 CMi, BD+11°1578, GC 9891, HD 58187, HIP 35987, HR 2820, SAO 96871[8]
Database references
SIMBADdata

1 Canis Minoris is a single[9] star in the equatorial constellation of Canis Minor, located about 287 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.37.[2] The radial velocity of this object is poorly constrained at −1.0±4.2 km/s.[2]

Cowley et al. (1969) listed a stellar classification of A5 IV[4] for 1 Canis Minoris, matching an A-type subgiant star that has exhausted the hydrogen at its core and is evolving into a giant. However, Gray and Garrison (1989) catalogued it as an A-type main-sequence star with a class of A4 V.[5] The Hipparcos team used a class of A3 Vn,[2] where the 'n' indicates "nebulous" lines due to rapid rotation.

This star is estimated to be 716 million years old[7] and is at or near the end of its main sequence lifetime.[3] It has a high rate of spin, showing a projected rotational velocity of 159 km/s.[3] The star has more than double the mass of the Sun with about 3.3 times the Sun's radius.[6] It is radiating 44 times the Sun's luminosity from its photosphere at an effective temperature of 8,222 K.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 3.3 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C. 
  5. ↑ 5.0 5.1 Gray, R. O.; Garrison, R. F. (July 1989), "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement 70: 623, doi:10.1086/191349, Bibcode: 1989ApJS...70..623G. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  7. ↑ 7.0 7.1 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  8. ↑ "1 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=1+CMi. 
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 



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