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HD 208741

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HD208741
Observation data
EpochJ2000EquinoxJ2000
Constellation Octans
A
Right ascension 22h03m03.8227s[1]
Declination −76° 07′ 06.453″[1]
Apparent magnitude(V) 5.93±0.01[2]
B
Right ascension 22h03m12.9150s[3]
Declination −76° 06′ 54.860″[3]
Apparent magnitude(V) 10.57[4]
Characteristics
A
Evolutionary stage main sequence[5]
Spectral type F3 III[6][7]
U−Bcolor index +0.11[8]
B−Vcolor index +0.39[8]
B
Spectral type K5[9]
B−Vcolor index +0.7
Astrometry
Radial velocity(Rv)8±1.1[10]km/s
Absolute magnitude(MV)+1.96[11]
A
Proper motion(μ)RA:+24.821[1]mas/yr
Dec.:−72.437[1]mas/yr
Parallax(π)15.4736 ± 0.0383mas[1]
Distance210.8 ± 0.5ly
(64.6 ± 0.2pc)
B
Proper motion(μ)RA:+29.912[3]mas/yr
Dec.:−71.414[3]mas/yr
Parallax(π)15.5058 ± 0.0249mas[3]
Distance210.3 ± 0.3ly
(64.5 ± 0.1pc)
Details
A
Mass1.52±0.25[12]M☉
Radius2.6±0.1[12]R☉
Luminosity12.9[13]L☉
Surface gravity(logg)3.89[14]cgs
Temperature6,937±80[14]K
Metallicity[Fe/H]+0.33[14]dex
Rotational velocity(vsini)36[15]km/s
Age1.1±0.1[16]Gyr
Other designations
66 G. Octantis,CD−76°1113,CPD−76°1542,FK53760,GC30788,HD208741,HIP108849,HR8380,SAO257993,WDSJ22031-7607A
Database references
SIMBADA
B

HD 208741,also known asHR 8380,is a yellowish-white huedstarlocated in the southerncircumpolar constellationOctans.It has anapparent magnitudeof 5.91,[2]making it faintly visible to thenaked eye.Parallaxmeasurements place it at a distance of 211light years,[1]and it is currently receding with a heliocentricradial velocityof8km/s.[10]

HD 208741 has a 10thmagnitudeK-type main-sequencecompanion[9]separated by34.8″.[4]Together, they make up a wide binary system designated collectively asCPD−76°1542.[4]Sir John Herschel,the discoverer of the pair, noted the primary to be a probablespectroscopic binary.[17]

This object has astellar classificationof F3 III,[6][7]indicating that it is a slightly evolvedF-type star.Gaia Data Release 3models it to be a dwarf that is 81.3% through itsmain sequencelifetime.[5]At present it has 1.52 times themass of the Sunand a slightly enlargedradiusof2.6R☉[12]due to its evolved state. It radiates at 12.9 times theluminosity of the Sun[13]from itsphotosphereat aneffective temperatureof6,937K.[14]HD 208741 has ametallicitytwice theSun's,[14]making it metal enriched. It is estimated to be 1.1billion yearsold,[16]and is spinning with aprojected rotational velocityof36km/s.[15]

References

[edit]
  1. ^abcdefBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
  2. ^abHøg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".Astronomy and Astrophysics.355:L27–L30.Bibcode:2000A&A...355L..27H.ISSN0004-6361.
  3. ^abcdeBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
  4. ^abcMason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog".The Astronomical Journal.122(6): 3466–3471.Bibcode:2001AJ....122.3466M.doi:10.1086/323920.ISSN0004-6256.
  5. ^abVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData Release 3. Summary of the content and survey properties ".Astronomy and Astrophysics.674:A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
  6. ^abde Vaucouleurs, A. (1 August 1957)."Spectral Types and Luminosities of B, A and F Southern Stars".Monthly Notices of the Royal Astronomical Society.117(4): 449–462.Bibcode:1957MNRAS.117..449D.doi:10.1093/mnras/117.4.449.eISSN1365-2966.ISSN0035-8711.
  7. ^abMalaroda, S. (August 1975)."Study of the F-type 1 MK spectral types".The Astronomical Journal.80:637.Bibcode:1975AJ.....80..637M.doi:10.1086/111786.ISSN0004-6256.
  8. ^abJohnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars".Communications of the Lunar and Planetary Laboratory.4:99–110.Bibcode:1966CoLPL...4...99J.
  9. ^abStoy, R. H. (1966). "Cape photographic catalogue for 1950.0; Meridian positions of standard stars, zone −64° to −80°".Annals of the Cape Observatory.21:0.Bibcode:1966AnCap..21....0S.
  10. ^abGontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system".Astronomy Letters.32(11): 759–771.arXiv:1606.08053.Bibcode:2006AstL...32..759G.doi:10.1134/S1063773706110065.eISSN1562-6873.ISSN1063-7737.S2CID119231169.
  11. ^Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331–346.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.eISSN1562-6873.ISSN1063-7737.S2CID119257644.
  12. ^abcStassun, Keivan G.; et al. (9 September 2019)."The RevisedTESSInput Catalog and Candidate Target List ".The Astronomical Journal.158(4): 138.arXiv:1905.10694.Bibcode:2019AJ....158..138S.doi:10.3847/1538-3881/ab3467.eISSN1538-3881.
  13. ^abMcDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012)."Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos".Monthly Notices of the Royal Astronomical Society.427(1): 343–357.arXiv:1208.2037.Bibcode:2012MNRAS.427..343M.doi:10.1111/j.1365-2966.2012.21873.x.eISSN1365-2966.ISSN0035-8711.
  14. ^abcdeCasagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011)."New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆".Astronomy & Astrophysics.530:A138.arXiv:1103.4651.Bibcode:2011A&A...530A.138C.doi:10.1051/0004-6361/201016276.eISSN1432-0746.ISSN0004-6361.
  15. ^abErspamer, D.; North, P. (28 January 2003)."Automated spectroscopic abundances of A and F-type stars using echelle spectrographs".Astronomy & Astrophysics.398(3): 1121–1135.arXiv:astro-ph/0210065.Bibcode:2003A&A...398.1121E.doi:10.1051/0004-6361:20021711.eISSN1432-0746.ISSN0004-6361.
  16. ^abNordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (16 April 2004)."The Geneva-Copenhagen survey of the Solar neighbourhood".Astronomy & Astrophysics.418(3): 989–1019.arXiv:astro-ph/0405198.Bibcode:2004A&A...418..989N.doi:10.1051/0004-6361:20035959.eISSN1432-0746.ISSN0004-6361.
  17. ^Herschel, J. F. W. (1835). "A Second Series of Micrometrical Measures of Double Stars chiefly performed with the 7-feet Equatorial, at Slough, in the years 1831, 1832, and 1833".Memoirs of the Royal Astronomical Society.8:37.Bibcode:1835MmRAS...8...37H.
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