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HD 200044

From Wikipedia, the free encyclopedia
M-type star in the constellation Delphinus
HD 200044
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationDelphinus
Right ascension21h 00m 27.6883s[1]
Declination+19° 19′ 46.493″[1]
Apparent magnitude (V)5.70±0.01[2]
Characteristics
Evolutionary stageAGB[3]
Spectral typeM3 IIIab[4]
B−Vcolor index+1.61[5]
Variable typesuspected[6]
Astrometry
Radial velocity (Rv)−15.07±0.09[7] km/s
Proper motion (μ)RA: −15.483mas/yr[1]
Dec.: −59.705mas/yr[1]
Parallax (π)5.455±0.0753 mas[1]
Distance598 ± 8 ly
(183 ± 3 pc)
Absolute magnitude (MV)−0.33[8]
Details
Mass1.32[9] M☉
Radius58[10] R☉
Luminosity507[11] L☉
Surface gravity (log g)0.93[12] cgs
Temperature3,707[10] K
Other designations
AG+19°2128,BD+18°4675,GC 29329,HD 200044,HIP 103675,HR 8044,SAO 106747,WDS J21005+1920A
Database references
SIMBADdata

HD 200044 (HR 8044) is a solitary[13]star in the equatorialconstellationDelphinus. It has anapparent magnitude of 5.7,[2] allowing it to be faintly seen with thenaked eye. The object is located 598light years away,[1] but is approaching theSolar System with a heliocentricradial velocity of−15.07 km/s.[7]

HD 200044 has aspectral classification of M3 IIIab,[4] indicating that its an ageingred giant. It is currently on theasymptotic giant branch and is fusing hydrogen and helium in shells around an inert carbon core.[3] As a consequence, it has expanded to 58 times theradius of the Sun and is now radiating with aluminosity over 500 times greater than that of theSun. HD 200044's large size and high luminosity yield aneffective temperature of 3,707K, giving it a red glow. HD 200044 is suspected to be a variable star with an amplitude of 0.05 magnitudes.[6]

There is a 10th magnitudeoptical companion separated49.3″ away and at a position angle of337° as of 2014. However, the separation is increasing due to HD 200044's high proper motion.[14]

References

[edit]
  1. ^abcdeBrown, A. G. A.; et al. (Gaia collaboration) (2021)."Gaia Early 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.S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source atVizieR.
  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.ISSN 0004-6361.
  3. ^abEggen, Olin J. (July 1992)."Asymptotic giant branch stars near the sun".The Astronomical Journal.104: 275.Bibcode:1992AJ....104..275E.doi:10.1086/116239.ISSN 0004-6256.
  4. ^abYamashita, Y. (1967). "MK Spectral Types of Bright M-Type Stars".Publications of the Dominion Astrophysical Observatory Victoria.13: 44.Bibcode:1967PDAO...13...47Y.ISSN 0078-6950.
  5. ^Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)".Private Communication.Bibcode:1970Priv.........0H.
  6. ^abSamus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1".Astronomy Reports.61 (1):80–88.Bibcode:2017ARep...61...80S.doi:10.1134/S1063772917010085.eISSN 1562-6881.ISSN 1063-7729.S2CID 255195566.
  7. ^abFamaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (18 February 2009)."Spectroscopic binaries among Hipparcos M giants".Astronomy & Astrophysics.498 (2):627–640.arXiv:0901.0934.Bibcode:2009A&A...498..627F.doi:10.1051/0004-6361/200810698.eISSN 1432-0746.ISSN 0004-6361.
  8. ^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.ISSN 1063-7737.S2CID 255204555.
  9. ^Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs".Astronomy and Astrophysics.657: 657.arXiv:2109.10912.Bibcode:2022A&A...657A...7K.doi:10.1051/0004-6361/202142146.S2CID 237605138.
  10. ^abStassun, Keivan G.; et al. (9 September 2019)."The Revised TESS Input Catalog and Candidate Target List".The Astronomical Journal.158 (4): 138.arXiv:1905.10694.Bibcode:2019AJ....158..138S.doi:10.3847/1538-3881/ab3467.ISSN 0004-6256.
  11. ^Brown, A. G. A.; et al. (Gaia collaboration) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties".Astronomy & Astrophysics.616. A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source atVizieR.
  12. ^McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017)."Fundamental parameters and infrared excesses of Tycho-Gaia stars".Monthly Notices of the Royal Astronomical Society.471 (1): 770.arXiv:1706.02208.Bibcode:2017MNRAS.471..770M.doi:10.1093/mnras/stx1433.
  13. ^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.arXiv:0806.2878.Bibcode:2008MNRAS.389..869E.doi:10.1111/j.1365-2966.2008.13596.x.S2CID 14878976.
  14. ^Mason, 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.ISSN 0004-6256.
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