Astronomy:HD 205765

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Short description: Star in the constellation Aquarius
HD 205765
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius[1]
Right ascension  21h 37m 33.76260s[2]
Declination −00° 23′ 26.0225″[2]
Apparent magnitude (V) 6.22[1]
Characteristics
Evolutionary stage main sequence[2][3]
Spectral type A2V[4]
U−B color index +0.055[5]
B−V color index +0.055[5]
Astrometry
Radial velocity (Rv)+16.9[6] km/s
Proper motion (μ) RA: −31.305[2] mas/yr
Dec.: −28.242[2] mas/yr
Parallax (π)8.8688 ± 0.0445[2] mas
Distance368 ± 2 ly
(112.8 ± 0.6 pc)
Absolute magnitude (MV)+0.96[1]
Details
Mass2.3[3][2] M☉
Radius2.4[7] R☉
Luminosity43[3] L☉
Temperature8,954[3] K
Metallicity [Fe/H]−0.17[8] dex
Rotational velocity (v sin i)191[3] km/s
Age476[2] Myr
Other designations
BD−01°4180, HD 205765, HIP 106758, HR 8263, SAO 145533.
Database references
SIMBADdata

HD 205765 is a star in the equatorial constellation of Aquarius. It is an A-type main sequence star with an apparent magnitude of 6.2, which, according to the Bortle scale, makes it faintly visible to the naked eye from dark rural skies. This star is spinning rapidly with a projected rotational velocity of 172 km/s.[9]

The Washington Double Star Catalog lists a 9th-magnitude companion at 31″ and a 14th-magnitude companion at 38″.[10] The brighter and closer star shares a common proper motion and distance with HD 205765,[11] while the fainter and more widely-separated star has a much smaller parallax.[12]

References

  1. ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 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 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD. Bibcode: 1986EgUBV........0M. 
  6. ↑ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington D.C.). Bibcode: 1953GCRV..C......0W. 
  7. ↑ Doyle, Lauren; Armstrong, David J.; Bayliss, Daniel; Rodel, Toby; Kunovac, Vedad (2024). "The TESS-SPOC FFI target sample explored with Gaia". Monthly Notices of the Royal Astronomical Society 529 (2): 1802. doi:10.1093/mnras/stae616. Bibcode: 2024MNRAS.529.1802D. 
  8. ↑ Marsakov, V. A.; Shevelev, Yu. G. (1995). "Catalogue of ages, metallicities, orbital elements and other parameters for nearby F stars". Bulletin d'Information du Centre de Donnees Stellaires 47: 13. Bibcode: 1995BICDS..47...13M. 
  9. ↑ Díaz, C. G. et al. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics 531: A143. doi:10.1051/0004-6361/201016386. Bibcode: 2011A&A...531A.143D. 
  10. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 
  11. ↑ 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.
  12. ↑ 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.



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