Astronomy:HD 200661

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Short description: Star in the constellation Equuleus
HD 200661
Location of HD 200661 (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Equuleus[1]
Right ascension  21h 04m 41.64052s[2]
Declination +02° 56′ 32.1874″[2]
Apparent magnitude (V) 6.41±0.01[3]
Characteristics
Evolutionary stage horizontal branch[4]
Spectral type K0 III[5]
U−B color index +0.89[6]
B−V color index +1.06[6]
Astrometry
Radial velocity (Rv)−12.1±0.2[7] km/s
Proper motion (μ) RA: +13.336[2] mas/yr
Dec.: +5.800[2] mas/yr
Parallax (π)7.5933 ± 0.0353[2] mas
Distance430 ± 2 ly
(131.7 ± 0.6 pc)
Absolute magnitude (MV)+0.53[1]
Details
Mass1.22[8] M☉
Radius10.64±0.54[9] R☉
Luminosity60.59+0.53−0.52[2] L☉
Surface gravity (log g)2.44[8] cgs
Temperature4,815±122[10] K
Metallicity [Fe/H]−0.21[11] dex
Other designations
BD+02°4297, GC 29434, HD 200661, HIP 104041, HR 8067, SAO 126519[12]
Database references
SIMBADdata

HD 200661 (HR 8067; 7 G. Equueli) is a solitary star located in the equatorial constellation Equuleus, the foal. It has an apparent magnitude of 6.41,[3] placing it near the limit for naked eye visibility. The star is located at a distance of 430 light years based on Gaia DR3 parallax measurements,[2] and it is drifting closer with a heliocentric radial velocity of −12.1 km/s.[7] At its current distance, HD 200661's brightness is diminished by an interstellar extinction of 0.18 magnitude,[13] and it has an absolute magnitude of +0.53.[1]

HD 200661 has a stellar classification of K0 III,[5] indicating that it is an evolved K-type star that has ceased hydrogen fusion at its core and left the main sequence. It has 122% the mass of the Sun,[8] but it has expanded to 10.64 times the radius of the Sun[9] as a result of its evolved state. It radiates 60.59 times the luminosity of the Sun[2] from its enlarged photosphere at an effective temperature of 4815 K,[10] giving it a yellowish-orange hue when viewed in the night sky. HD 200661 is metal deficient with an iron abundance 61.7% that of the Sun's.[11]

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  XHIP record for this object at VizieR.
  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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  4. ↑ Gontcharov, G. A. (November 2008). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters 34 (11): 785–796. doi:10.1134/S1063773708110078. ISSN 0004-6299. Bibcode: 2008AstL...34..785G. 
  5. ↑ 5.0 5.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey 05: 0. Bibcode: 1999MSS...C05....0H. 
  6. ↑ 6.0 6.1 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals 7. Bibcode: 1971ROAn....7.....C. 
  7. ↑ 7.0 7.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  8. ↑ 8.0 8.1 8.2 Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. 
  9. ↑ 9.0 9.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 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. 
  11. ↑ 11.0 11.1 Bartkevicius, A.; Lazauskaite, R. (January 1, 1997). "Classification of Population II Stars in the Vilnius Photometric System. II. Results". Open Astronomy 6 (4). doi:10.1515/astro-1997-0402. ISSN 2543-6376. Bibcode: 1997BaltA...6..499B. 
  12. ↑ "HR 8067". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+8067. 
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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