HD 193307

HD 193307
Location of HD 193307 (circled)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Telescopium
A
Right ascension 20h 21m 41.03652s
Declination −49° 59′ 57.9001″
Apparent magnitude (V) 6.27
B
Right ascension 20h 21m 39.11678s
Declination −49° 59′ 47.2058″
Apparent magnitude (V) 12.8
Characteristics
A
Spectral type F9 V
U−B color index –0.02
B−V color index +0.55
B
Spectral type M2.5
Astrometry
A
Radial velocity (Rv)16.9±0.65 km/s
Proper motion (μ) RA: −357.855 mas/yr
Dec.: −250.604 mas/yr
Parallax (π)32.0547±0.0415 mas
Distance101.7 ± 0.1 ly
(31.20 ± 0.04 pc)
Absolute magnitude (MV)+3.80
B
Radial velocity (Rv)18.33±0.39 km/s
Proper motion (μ) RA: −350.120 mas/yr
Dec.: −252.474 mas/yr
Parallax (π)32.0177±0.0193 mas
Distance101.87 ± 0.06 ly
(31.23 ± 0.02 pc)
Details
A
Mass1.15±0.16 M☉
Radius1.49±0.07 R☉
Luminosity2.605±0.006 L☉
Surface gravity (log g)4.11±0.03 cgs
Temperature6,059+96
−59 K
Metallicity [Fe/H]−0.34±0.06 dex
Rotational velocity (v sin i)<5 km/s
Age7.55+0.62
−0.85 Gyr
Other designations
WDS J20217-5000AB
A: 86 G. Telescopii, CD–50°12929, CPD−50°11341, FK5 3630, GC 28291, GJ 9691, HD 193307, HIP 100412, HR 7766, SAO 246546
B: WT 703
Database references
SIMBADA
B

HD 193307 (HR 7766; Gliese 9691) is the primary of a binary star located the southern constellation Telescopium. It has an apparent magnitude of 6.27, placing it near the limit for naked eye visibility, even under ideal conditions. The star is located relatively close at a distance of 102 light years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 16.9 km/s. At its current distance, HD 193307's brightness is diminished by 0.18 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of +3.80. HD 193307 has a relatively high proper motion, moving at a rate of 437 mas/yr.

There have been disagreements in the stellar classification of the object. Two sources give a class of F9 V, indicating that it is an ordinary F-type main-sequence star. David Stanley Evans gave it a slightly more evolved class of G2 IV-V, meaning that it is a G-type star with a luminosity class intermediate between a subgiant and main sequence star. Nancy Houk's spectral classification catalog lists HD 193307 as G0 V.

The accepted class for HD 193307 is F9 V. The object's current luminosity is 1.49 magnitudes above the ZAMS, indicating that HD 193307 is somewhat evolved. has 1.15 times the Sun's mass and a slightly enlarged radius of 1.49 R☉. It radiates 2.61 times the luminosity of the Sun from its photosphere at an effective temperature of 6,059 K, which gives it the typical whitish-yellow hue of a late F-type star. At the age of 7.55 billion years, HD 193307 has nearly twice the Sun's age. The star is metal-deficient with an iron abundance 46% that of the Sun ([Fe/H] = −0.34) and it spins slowly with a projected rotational velocity lower than 5 km/s.

WT 703 is a 12th magnitude star located 21.3" away along a position angle of 300°. It has a class of M2.5, indicating that it is a M-type star. WT 703 is located around the same distance as HD 193307 and it has a similar proper motion.

References

  1. 1 2 3 4 5 6 7 8 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.
  2. 1 2 3 4 Przybylski, A.; Kennedy, P. M. (1 December 1965). "Radial Velocities and Three-colour Photometry of 166 Southern Stars". Monthly Notices of the Royal Astronomical Society. 131 (1): 95–104. Bibcode:1965MNRAS.131...95P. doi:10.1093/mnras/131.1.95. eISSN 1365-2966. ISSN 0035-8711. S2CID 122694200.
  3. 1 2 3 4 5 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. 1 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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256. S2CID 119533755.
  5. 1 2 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. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256. S2CID 250741593.
  6. ↑ Scholz, R.-D. (16 February 2016). "Overlooked wide companions of nearby F stars". Astronomy & Astrophysics. 587: A51. arXiv:1601.01896. Bibcode:2016A&A...587A..51S. doi:10.1051/0004-6361/201527965. eISSN 1432-0746. ISSN 0004-6361. S2CID 118348424.
  7. 1 2 Valenti, Jeff A.; Fischer, Debra A. (July 2005). "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs". The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500. eISSN 1538-4365. ISSN 0067-0049. S2CID 121398064.
  8. 1 2 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.
  9. ↑ 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.
  10. ↑ Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. eISSN 1538-3881. S2CID 73582386.
  11. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  12. 1 2 3 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 & Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. eISSN 1432-0746. ISSN 0004-6361. S2CID 62799777.
  13. 1 2 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.
  14. 1 2 Ramírez, I.; Fish, J. R.; Lambert, D. L.; Allende Prieto, C. (13 August 2012). "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets". The Astrophysical Journal. 756 (1): 46. arXiv:1207.0499. Bibcode:2012ApJ...756...46R. doi:10.1088/0004-637X/756/1/46. eISSN 1538-4357. ISSN 0004-637X. S2CID 119199829.
  15. 1 2 Groot, P. J.; Piters, A. J. M.; Paradijs, van (September 1996). "Rotational velocities of F dwarfs; application of the Fourier-Bessel transformation method" (PDF). Astronomy and Astrophysics Supplement Series. 118 (3): 545–555. Bibcode:1996A&AS..118..545G. doi:10.1051/aas:1996214. ISSN 0365-0138. S2CID 53481766.
  16. 1 2 "HD 193307". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 24, 2021.
  17. ↑ 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.
  18. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  19. ↑ Knapp, Wilfried; Nanson, John (January 2019). "A Catalog of High Proper Motion Stars in the Southern Sky (HPMS3 Catalog)". Journal of Double Star Observations. 15 (1): 21–41. Bibcode:2019JDSO...15...21K.
  20. ↑ Evans, D. S.; Menzies, A.; Stoy, R. H.; Wayman, P. A. (1961). "Fundamental data for southern stars (fourth list)". Royal Greenwich Observatory Bulletins. 48: 389–405. Bibcode:1961RGOB...48..389E.
  21. ↑ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  22. ↑ Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (16 April 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. eISSN 1432-0746. ISSN 0004-6361. S2CID 11027621.