Astronomy:HD 92209

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Short description: Suspected spectroscopic binary
HD 92209
Location of HD 92209 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Chamaeleon[1]
Right ascension  10h 35m 24.7604s[2]
Declination −76° 18′ 32.337″[2]
Apparent magnitude (V) 6.29±0.01[3]
Characteristics
Spectral type K2 III[4]
U−B color index +1.27[5]
B−V color index +1.20[5]
Astrometry
Radial velocity (Rv)17.8±2.3[6] km/s
Proper motion (μ) RA: −16.952[2] mas/yr
Dec.: +6.489[2] mas/yr
Parallax (π)5.4324 ± 0.1144[2] mas
Distance600 ± 10 ly
(184 ± 4 pc)
Absolute magnitude (MV)+0.53[1]
Details
Mass1.22[7] M☉
Radius14.39[8] R☉
Luminosity81.3+9.9−8.8[9] L☉
Surface gravity (log g)1.76[7] cgs
Temperature4,460±90[9] K
Metallicity [Fe/H]+0.06[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
CPD−75°678, FK5 2847, GC 14595, HD 92209, HIP 51835, HR 4170, SAO 256730[12][13]
Database references
SIMBADdata

HD 92209 (HR 4170) is a probable spectroscopic binary[11] in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.29,[3] placing it near the max naked eye visibility. Parallax measurements place the system at a distance of 600 light years[2] and is currently receding with a heliocentric radial velocity of almost 18 km/s.[6]

The visible component has a stellar classification of K2 III,[4] indicating that it is a red giant. As a consequence, it has expanded to 14.39 times the radius of the Sun.[8] Nevertheless, it has 122% the mass of the Sun[7] and shines with a luminosity of 81.3 L☉,[9] yielding an effective temperature of 4,460 K[9] from its enlarged photosphere, which in turn gives an orange hue. HD 92209 has a metallicity 115% that of the Sun[10] and spins leisurely with a projected rotational velocity lower than 1 km/s.[11]

References

  1. ↑ 1.0 1.1 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 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. (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. ↑ 4.0 4.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0.. Bibcode: 1975mcts.book.....H. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 7.2 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  9. ↑ 9.0 9.1 9.2 9.3 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C. 
  10. ↑ 10.0 10.1 Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal 107: 594. doi:10.1086/116879. ISSN 0004-6256. Bibcode: 1994AJ....107..594E. 
  11. ↑ 11.0 11.1 11.2 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. ↑ "HD 92209". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+92209. 
  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. 



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