HD 193307

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HD 193307
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 20h 21m 41.04s[1]
Declination −49° 59′ 57.90″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type F9 V[3]
U−B color index –0.02[4]
B−V color index +0.55[4]
Astrometry
Radial velocity (Rv)18.31±0.17[1] km/s
Proper motion (μ) RA: -357.607[1] mas/yr
Dec.: -250.530[1] mas/yr
Parallax (π)32.0547 ± 0.0415[1] mas
Distance101.7 ± 0.1 ly
(31.20 ± 0.04 pc)
Absolute magnitude (MV)+3.8[2]
Details
Mass1.15±0.16[5] M☉
Radius1.45±0.04[1] R☉
Luminosity2.57±0.00[1] L☉
Surface gravity (log g)4.11±0.23[5] cgs
Temperature6,059+96
−59[1] K
Metallicity [Fe/H]−0.34±0.06[6] dex
Rotational velocity (v sin i)4.5[7] km/s
Age7.55+0.62
−0.85[6] Gyr
Other designations
CD–50 12929, GJ 9691, HD 193307, HIP 100412, HR 7766, SAO 246546, WDS J20217-5000A
Database references
SIMBADdata

HD 193307 (HR 7766; Gliese 9691) is a star in the southern constellation Telescopium. With an apparent magnitude of 6.26, it is barely visible to the naked eye under ideal conditions. The star is located about 102 light years away based on parallax, but is drifting away with a radial velocity of 18.31 km/s.

Properties[]

HD 193307 has 1.15 times the Sun's mass, and 1.45 times the Sun's radius. It radiates at a luminosity twice the latter from its photosphere at an effective temperature of 6,059 K, which gives it the yellow-white hue of an F-type main-sequence star. HD 193307 has an age of about 7 billion years, nearly twice the Sun's age. It is metal-deficient, with an iron abundance 46% that of the Sun. HD 193307 has a common proper motion M2.5 companion 21.3" away, which makes it a binary star.[8]

References[]

  1. ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38: 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  3. ^ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132: 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. ISSN 0004-6256.
  4. ^ a b Przybylski, A.; Kennedy, P. M. (January 1965). "Radial velocities and three-colour photometry of 166 southern stars". Monthly Notices of the Royal Astronomical Society. 131: 95. Bibcode:1965MNRAS.131...95P. doi:10.1093/mnras/131.1.95. ISSN 0035-8711.
  5. ^ a b Stassun, Keivan G.; et al. (September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156: 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256.
  6. ^ a b Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy and Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. ISSN 0004-6361.
  7. ^ Llorente de Andrés, F.; Chavero, C.; de la Reza, R.; Roca-Fàbrega, S.; Cifuentes, C. (October 2021). "The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert". Astronomy and Astrophysics. 654: A137. arXiv:2108.05852. Bibcode:2021A&A...654A.137L. doi:10.1051/0004-6361/202141339. ISSN 0004-6361.
  8. ^ 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: 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
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