Wikipedia

HD 164712

(Redirected from HR 6731)

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
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: -296.819 mas/yr[1]
Parallax (π)14.2681 ± 0.0440 mas[1]
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
66 G. Apodis[12], CD−75°1016, CPD−75°1410, FK5 678, GC 24680, HD 164712, HIP 89115, HR 6731, SAO 257569, WDS J18113-7553A[13]
Database references
SIMBADdata

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.[14] 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 L☉ 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°.[15] Component C is a 14th magnitude star 18.1″ away along a position angle of 109°.[15] The first one is a background object while the other one appears to be physically related.[15] As for HD 164712, it shows indications of an infrared excess, suggesting there may be a dusty disk in orbit around the star.[16][17]

References

edit
  1. ^ a b c d e Brown, 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 at VizieR.
  2. ^ a b c 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  3. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. 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. ^ a b 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. ^ a b 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  7. ^ a b c 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. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361.
  8. ^ a b Stassun, 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. eISSN 1538-3881.
  9. ^ a b c Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. eISSN 1432-0746. ISSN 0004-6361.
  10. ^ a b Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal. 106: 80. Bibcode:1993AJ....106...80E. doi:10.1086/116622.
  11. ^ a b 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. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
  12. ^ 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.
  13. ^ "HR 6731". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 15, 2022.
  14. ^ Evans, D. S. (1966). "Fundamental data for Southern stars (6th list)". Royal Greenwich Observatory Bulletins. 110: 185. Bibcode:1966RGOB..110..185E.
  15. ^ a b c 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.
  16. ^ Zuckerman, B.; Kim, Sungsoo S.; Liu, T. (June 1995). "Luminosity Class III Stars with Excess Far-Infrared Emission". The Astrophysical Journal. 446: L79. Bibcode:1995ApJ...446L..79Z. doi:10.1086/187935. eISSN 1538-4357. ISSN 0004-637X.
  17. ^ Plets, H.; et al. (July 1997), "Giants with infrared excess.", Astronomy and Astrophysics, 323: 513–523, Bibcode:1997A&A...323..513P
edit
Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_164712&oldid=1170067178"