Astronomy:HD 164712

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Short description: Star in the constellation Apus
HD 164712
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Apus
Right ascension  18h 11m 15.80732s[1]
Declination −75° 53′ 29.4836″[1]
Apparent magnitude (V) 5.86[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K2 III[4]
U−B color index +1.43[5]
B−V color index +1.24[5]
Astrometry
Radial velocity (Rv)14.8±3.2[6] km/s
Proper motion (μ) RA: +16.16[1] mas/yr
Dec.: -296.819[1] mas/yr
Parallax (π)14.2681 ± 0.0440[1] mas
Distance228.6 ± 0.7 ly
(70.1 ± 0.2 pc)
Absolute magnitude (MV)+1.48[2]
Details
Mass1.15[7] M☉
Radius9.09[8] R☉
Luminosity33.1+1.6−1.5[9] L☉
Surface gravity (log g)2.55[7] cgs
Temperature4,360±90[9] K
Metallicity [Fe/H]+0.24[10] dex
Rotational velocity (v sin i)<1.5[11] km/s
Age4.54+0.46−0.56[3] Gyr
Other designations
CD−75°1016, CPD−75°1410, FK5 678, GC 24680, HD 164712, HIP 89115, HR 6731, SAO 257569, WDS J18113-7553A[12]
Database references
SIMBADdata

HD 164712, also known as HR 6731 is an orange hued star located in the southern constellation of Apus. It has an apparent magnitude of 5.86,[2] making it faintly visible to the naked eye if viewed under ideal conditons. Parallax measurements place the object at a distance of 229 light-years (70 pc),[1] and it is currently receding with a heliocentric radial velocity of 14.8 km/s.[6]

HD 164712 has a stellar classification of K2 III, indicating that it is a red giant. David Stanley Evans gave it a slightly cooler class of K3 III.[13] Gaia Data Release 3 models place it on the bump of red giant branch, a period of temporary contraction.[3] At present it has 1.15 times the mass of the Sun[7] but at an age of 4.54 billion years,[3] it has expanded to 9.09 times its girth.[8] It shines with a luminosity of 33.1 solar luminosity from its enlarged photosphere at an effective temperature of 4,360 K.[9] HD 164712 is a thick disk star with an iron abundance 73% above solar level.[10] This makes it metal enriched. Like most giants, it spins slowly, with its projected rotational velocity being lower than 1.5 km/s.[11]

HR 6731 has two faint companions. Component B is a 13th magnitude object separated 24.6″ away along a position angle of 299°.[14] Component C is a 14th magnitude star 18.1″ away along a position angle of 109°.[14] The first one is a background object while the other one appears to be physically related.[14] As for HD 164712, it shows indications of an infrared excess, suggesting there may be a dusty disk in orbit around the star.[15][16]

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 2.2 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. 
  3. ↑ 3.0 3.1 3.2 3.3 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.
  4. ↑ 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°. 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 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. 
  9. ↑ 9.0 9.1 9.2 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. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal 106: 80. doi:10.1086/116622. Bibcode: 1993AJ....106...80E. 
  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". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HR 6731". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+6731. 
  13. ↑ Evans, D. S. (1966). "Fundamental data for Southern stars (6th list).". Royal Greenwich Observatory Bulletins 110: 185. Bibcode: 1966RGOB..110..185E. 
  14. ↑ 14.0 14.1 14.2 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. 
  15. ↑ Zuckerman, B.; Kim, Sungsoo S.; Liu, T. (June 1995). "Luminosity Class III Stars with Excess Far-Infrared Emission". The Astrophysical Journal 446: L79. doi:10.1086/187935. ISSN 0004-637X. Bibcode: 1995ApJ...446L..79Z. 
  16. ↑ Plets, H. et al. (July 1997), "Giants with infrared excess.", Astronomy and Astrophysics 323: 513–523, Bibcode: 1997A&A...323..513P 
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