Astronomy:HD 194953

From HandWiki
Short description: High proper motion star
HD 194953
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Delphinus
Right ascension  20h 28m 16.7824s[1]
Declination +02° 56′ 14.0305″[1]
Apparent magnitude (V) 6.19±0.01[2]
Characteristics
Spectral type G8 III/IV[3]
U−B color index +0.56[4]
B−V color index +0.90[4]
Astrometry
Radial velocity (Rv)−28±0.4[5] km/s
Proper motion (μ) RA: +50.801[1] mas/yr
Dec.: −5.249[1] mas/yr
Parallax (π)7.8706 ± 0.1437[1] mas
Distance414 ± 8 ly
(127 ± 2 pc)
Absolute magnitude (MV)+0.74[6]
Details
Mass2.38[7] M☉
Radius10.22[8] R☉
Luminosity53.7[9] L☉
Surface gravity (log g)2.88[10] cgs
Temperature5,101±122[8] K
Metallicity [Fe/H]−0.11[10] dex
Rotational velocity (v sin i)2.4±1.2[11] km/s
Age640[7] Myr
Other designations
BD+02°4175, GC 28470, HD 194953, HIP 100969, HR 7824, SAO 125843[12][13]
Database references
SIMBADdata

HD 194953 (HR 7824) is a solitary star in the equatorial constellation Delphinus. It is faintly visible to the naked eye with an apparent magnitude of 6.19[2] and is located 414 light years away.[1] However, it is approaching the Solar System with a heliocentric radial velocity of −28 km/s.[5]

HD 194953 has a stellar classification of G8 III/IV[3] — a blended luminosity class of a subgiant and giant. It has 2.38 times the mass of the Sun[7] and an enlarged radius of 10.2 R☉[8] at an age of 640 million years.[7] It radiates at 54 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 5,101 K,[8] giving a yellow hue. HD 194953 is slightly metal deficient with an iron abundance 78% that of the Sun[10] and spins leisurely with a projected rotational velocity of about 2.4 km/s.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (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. 
  3. ↑ 3.0 3.1 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. 
  4. ↑ 4.0 4.1 Cousins, A. W. J. (16 November 1964). "Photometric Data for Stars in the Equatorial Zone (Seventh List)". Monthly Notes of the Astronomical Society of South Africa 23: 175. ISSN 0024-8266. Bibcode: 1964MNSSA..23..175C. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 7.3 Bertelli, G.; Bressan, A.; Chiosi, C.; Fagotto, F.; Nasi, E. (August 1994). "Theoretical isochrones from models with new radiative opacities". Astronomy and Astrophysics Supplement Series 106: 275–302. ISSN 0365-0138. Bibcode: 1994A&AS..106..275B. 
  8. ↑ 8.0 8.1 8.2 8.3 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. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  9. ↑ 9.0 9.1 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256. Bibcode: 2015AJ....150...88L. 
  10. ↑ 10.0 10.1 10.2 Liu, Y. J.; Tan, K. F.; Wang, L.; Zhao, G.; Sato, Bun'ei; Takeda, Y.; Li, H. N. (31 March 2014). "The Lithium Abundances of a Large Sample of Red Giants". The Astrophysical Journal 785 (2): 94. doi:10.1088/0004-637X/785/2/94. ISSN 0004-637X. Bibcode: 2014ApJ...785...94L. 
  11. ↑ 11.0 11.1 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series 139 (3): 433–460. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  12. ↑ "HR 7824". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+7824. 
  13. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino 1. Bibcode: 1879RNAO....1.....G. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:HD_194953&oldid=3425443"