Astronomy:HD 167714

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Short description: Star in the constellation of Octans
HD 167714
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Octans
Right ascension  18h 29m 19.94396s[1]
Declination −80° 13′ 57.7452″[1]
Apparent magnitude (V) 5.95±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K2 III[4]
U−B color index +1.27[5]
B−V color index +1.16[5]
Astrometry
Radial velocity (Rv)−13.9±0.4[6] km/s
Proper motion (μ) RA: −22.298[1] mas/yr
Dec.: −63.166[1] mas/yr
Parallax (π)9.0795 ± 0.026[1] mas
Distance359 ± 1 ly
(110.1 ± 0.3 pc)
Absolute magnitude (MV)+0.57[7]
Details
Mass1.39+0.40−1.10[8] M☉
Radius12.28[9] R☉
Luminosity64.6+3.0−2.9[8] L☉
Surface gravity (log g)2.55[1] cgs
Temperature4,692±122[9] K
Metallicity [Fe/H]+0.11[10] dex
Rotational velocity (v sin i)1.7±1.2[11] km/s
Age1.99+0.843−0.453[10] Gyr
Other designations
CPD−80°849, GC 25089, HD 167714, HIP 90606, HR 6837, SAO 258796[12]
Database references
SIMBADdata

HD 167714, also known as HR 6837, is a solitary, orange hued star located in the southern circumpolar constellation Octans. It has apparent magnitude of 5.95,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from Gaia, the object is estimated to be 359 light years distant.[1] With a heliocentric radial velocity of −13.9 km/s,[6] it is approaching the Solar System.

This is an evolved red giant with a stellar classification of K2 III.[4] It appears to be on the red giant branch,[3] generating energy by fusing a hydrogen shell around an inert helium core. At present it has 1.4 times the mass of the Sun[8] and at the age of two billion years,[10] it has expanded to 12.3 times its girth.[9] It shines with a luminosity 65 times greater than that of the Sun[8] from its enlarged photosphere at an effective temperature of 4,692 K.[9] HD 167714 has a near-solar metallicity[10] and is spinning slowly with a projected rotational velocity of 1.7 km/s.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 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. ↑ 3.0 3.1 Cardiel, Nicolás; Zamorano, Jaime; Carrasco, Josep Manel; Masana, Eduard; Bará, Salvador; González, Rafael; Izquierdo, Jaime; Pascual, Sergio et al. (23 July 2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society 507 (1): 318–329. doi:10.1093/mnras/stab2124. ISSN 0035-8711. Bibcode: 2021MNRAS.507..318C. 
  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°. 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. ↑ 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 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. 
  9. ↑ 9.0 9.1 9.2 9.3 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. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 10.2 10.3 Soto, M. G.; Jones, M. I.; Jenkins, J. S. (2021). "SPECIES. II. Stellar parameters of the EXPRESS giant star sample". Astronomy and Astrophysics 647: 647. doi:10.1051/0004-6361/202039357. Bibcode: 2021A&A...647A.157S. 
  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. ↑ "HD 167714". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+167714. 
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