Astronomy:HD 82205

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Short description: Star in the constellation Antlia
HD 82205
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Antlia
Right ascension  09h 29m 54.5048s[1]
Declination −26° 35′ 22.6154″[1]
Apparent magnitude (V) 5.48±0.01[2]
Characteristics
Spectral type K3 III[3]
B−V color index +1.36[4]
Astrometry
Radial velocity (Rv)12±2[5] km/s
Proper motion (μ) RA: −21.883[1] mas/yr
Dec.: +0.761[1] mas/yr
Parallax (π)4.0447 ± 0.0731[1] mas
Distance810 ± 10 ly
(247 ± 4 pc)
Absolute magnitude (MV)−1.42[6]
Details
Mass4.46[7] M☉
Radius38.86[8] R☉
Luminosity552[9] L☉
Surface gravity (log g)1.61±0.01[10] cgs
Temperature4,413±122[8] K
Metallicity [Fe/H]+0.09[11] dex
Rotational velocity (v sin i)<1[12] km/s
Other designations
CD−26°7117, GC 13110, HD 82205, HR 3770, SAO 177546, WDS J09299-2635A[13]
Database references
SIMBADdata

HD 82205 (HR 3770) is a solitary star[14] in the southern constellation Antlia. It is faintly visible to the naked eye with an apparent magnitude of 5.48[2] and is estimated to be 810 light years[1] distant based on parallax measurements. However, it is receding with a heliocentric radial velocity of 12 km/s.[5]

HD 82205 has a general stellar classification of K3 III, indicating that it is a red giant. However, Houk and Cowley (1982) found a slightly warmer class of K2 III CNII,[15] which also suggests a strong overabundance of cyano radicals in the stellar atmosphere. At present it has 4.46 times the mass of the Sun[7] but has expanded to 38.9 times its girth.[8] It shines with a luminosity of 552 solar luminosity[9] from its enlarged photosphere at an effective temperature of 4,413 K,[8] giving an orange hue. HD 82205 has a metallicity 123% that of the Sun and is believed to be a member of the thin disk population.[11] Currently, it spins with a projected rotational velocity lower than 1 km/s.[12]

There is a 14th magnitude optical companion separated 12.4 arcseconds away along a position angle of 131°.[16] The object was first noticed by T.J.J See in 1897.[17]

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. ↑ Abt, H. A. (September 1985). "Visual multiples. VIII - 1000 MK types". The Astrophysical Journal Supplement Series 59: 95. doi:10.1086/191064. ISSN 0067-0049. Bibcode: 1985ApJS...59...95A. 
  4. ↑ 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. 
  5. ↑ 5.0 5.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities.". Carnegie Institute Washington D.C. Publication: 0. Bibcode: 1953GCRV..C......0W. 
  6. ↑ 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. 
  7. ↑ 7.0 7.1 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. 
  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 McDonald, 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. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  10. ↑ 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.
  11. ↑ 11.0 11.1 Eggen, Olin J. (January 1989). "Large and Kinematically Unbiased Samples of G- and K-Type Stars. III. Evolved Young Disk Stars in the Bright Star Sample". Publications of the Astronomical Society of the Pacific 101: 54. doi:10.1086/132404. ISSN 0004-6280. Bibcode: 1989PASP..101...54E. 
  12. ↑ 12.0 12.1 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. 
  13. ↑ "HR 3770". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+3770. 
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  15. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  16. ↑ 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  17. ↑ See, T. J. J. (1897). "New Double Stars in the Southern Hemisphere discovered at the Lowell Observatory" (in de). Astronomische Nachrichten 143 (23–24): 413–416. doi:10.1002/asna.18971432305. ISSN 0004-6337. Bibcode: 1897AN....143..413S. 
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