HD 173791

HD 173791 (HR 7065) is a solitary[10] star located in the constellation Telescopium. It has an apparent magnitude of 5.80,[2] allowing it to be viewed with the naked eye under suitable viewing conditions. Located about 364 light years away,[1] the star is receding from the Solar System with a heliocentric radial velocity of 9.7 km/s.[6]

HD 173791
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 49m 27.3433s[1]
Declination –45° 48′ 36.3601″[1]
Apparent magnitude (V) 5.80 ± 0.01[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type G8 III[4]
B−V color index +0.9[5]
Astrometry
Radial velocity (Rv)9.7 ± 2.9[6] km/s
Proper motion (μ) RA: +74.263[1] mas/yr
Dec.: +57.015[1] mas/yr
Parallax (π)8.9671 ± 0.0429 mas[1]
Distance364 ± 2 ly
(111.5 ± 0.5 pc)
Absolute magnitude (MV)+0.6[7]
Details[3]
Mass1.87 M☉
Radius10.74 R☉
Luminosity67 L☉
Surface gravity (log g)2.68 cgs
Temperature5,040 K
Metallicity [Fe/H]−0.43 ± 0.16 dex
Rotational velocity (v sin i)3.11 km/s
Other designations
30 G. Telescopii[8], CPD−45 9479, FK5 3495, HD 173791, HIP 92367, SAO 229306[9]
Database references
SIMBADdata

This is an ageing G-type star that is currently on the horizontal branch.[3] At present it has 1.87 times the mass of the Sun but has expanded to 10.74 times its girth.[3] It radiates at 67 L☉ from its enlarged photosphere at an effective temperature of 5,040 K,[3] giving it a yellow glow. HD 173791 is metal deficient–with a metallicity only 37% that of the Sun;[3] it spins modestly with a projected rotational velocity of 3.11 km/s.[3]

References
  1. 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. Gaia EDR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics. 536: A71. arXiv:1110.6459. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. ISSN 0004-6361.
  4. Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
  5. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. 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. ISSN 1063-7737. S2CID 119231169.
  7. 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. ISSN 1063-7737.
  8. Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
  9. "HR 7065 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-19
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976
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