Astronomy:HD 200073

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Short description: K-type giant in Microscopium
HD 200073
Microscopium constellation map.svg
Red circle.svg
Location of HD 200037 and ζ Microscopii on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Microscopium
Right ascension  21h 02m 27.16546s[1]
Declination −38° 31′ 51.4904″[1]
Apparent magnitude (V) 5.94[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K2 III[4] or K0 IV[5]
B−V color index +1.15[2]
Astrometry
Radial velocity (Rv)39±10[6] km/s
Proper motion (μ) RA: +156.842[1] mas/yr
Dec.: −171.108[1] mas/yr
Parallax (π)14.358 ± 0.0466[1] mas
Distance227.2 ± 0.7 ly
(69.6 ± 0.2 pc)
Absolute magnitude (MV)+1.79[7]
Details
Mass1.03[8] M☉
Radius9.15±0.46[9] R☉
Luminosity28.8±0.3[1] L☉
Surface gravity (log g)2.75[8] cgs
Temperature4,569±50[10] K
Metallicity [Fe/H]−0.13[8] dex
Rotational velocity (v sin i)2.7±1.1[11] km/s
Age8.79+2.32−2.04[12] Gyr
Other designations
CD−39°14079, CPD−39°8841, GC 29351, HD 200073, HIP 103836, HR 8046, SAO 212653[13]
Database references
SIMBADdata

HD 200073 (HR 8046; 43 G. Microscopii) is a solitary star located in the southern constellation Microscopium 8.5′ northwest of Zeta Microscopii. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.94.[2] The object is located relatively close at a distance of 227 light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 39 km/s.[6] At its current distance, HD 200073's brightness is diminished by an interstellar extinction of 0.13 magnitudes[14] and it has an absolute magnitude of +1.79.[7] It has a relatively high proper motion across the celestial sphere, moving at a rate of 213 mas/yr.[1]

HD 200073 has a stellar classification of K2 III,[4] indicating that it is an evolved K-type giant that has exhausted hydrogen at its core and left the main sequence. Astronomer David Stanley Evans gave a class of K0 IV,[5] indicating that it is a slightly evolved subgiant that is ceasing hydrogen fusion at its core. HD 200073 is currently on the red giant branch,[3] fusing hydrogen in a shell around an inert helium core. It has a comparable mass to the Sun[8] but at the age of 8.79 billion years,[12] it has expanded to 9.15 times the radius of the Sun.[9] It radiates 28.8 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,569 K.[10] HD 200073 is slightly metal-deficient with an iron abundance of [Fe/H] = −0.13 or 74.1% of the Sun's.[8] It spins modestly with a projected rotational velocity of 2.7 km/s.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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.
  2. ↑ 2.0 2.1 2.2 Johnson, 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. 
  3. ↑ 3.0 3.1 Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics 536: A71. doi:10.1051/0004-6361/201117887. ISSN 0004-6361. Bibcode: 2011A&A...536A..71J. 
  4. ↑ 4.0 4.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. 3. Bibcode: 1982mcts.book.....H. 
  5. ↑ 5.0 5.1 Evans, D. S.; Laing, J. D.; Menzies, A.; Stoy, R. H. (1964). "Fundamental data for southern stars (fifth list)". Royal Greenwich Observatory Bulletins 85: 207–224. Bibcode: 1964RGOB...85..207E. 
  6. ↑ 6.0 6.1 Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889–896. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Wittenmyer, Robert A.; Liu, Fan; Wang, Liang; Casagrande, Luca; Johnson, John Asher; Tinney, C. G. (June 24, 2016). "The Pan-Pacific Planet Search. V. Fundamental Parameters for 164 Evolved Stars". The Astronomical Journal (American Astronomical Society) 152 (1): 19. doi:10.3847/0004-6256/152/1/19. ISSN 1538-3881. Bibcode: 2016AJ....152...19W. 
  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 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ 12.0 12.1 Soto, M. G.; Jones, M. I.; Jenkins, J. S. (March 2021). "SPECIES. II. Stellar parameters of the EXPRESS giant star sample". Astronomy & Astrophysics 647: A157 (23). doi:10.1051/0004-6361/202039357. ISSN 0004-6361. Bibcode: 2021A&A...647A.157S. 
  13. ↑ "HD 200073". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+200073. 
  14. ↑ 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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