HD 193307

Last updated
HD 193307
Telescopium constellation map.svg
Red circle.svg
Location of HD 193307 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
A
Right ascension 20h 21m 41.03652s [1]
Declination −49° 59′ 57.9001″ [1]
Apparent magnitude  (V)6.27 [2]
B
Right ascension 20h 21m 39.11678s [3]
Declination −49° 59′ 47.2058″ [3]
Apparent magnitude  (V)12.8 [4]
Characteristics
A
Spectral type F9 V [5]
U−B color index –0.02 [2]
B−V color index +0.55 [2]
B
Spectral type M2.5 [6]
Astrometry
A
Radial velocity (Rv)16.9±0.65 [7]  km/s
Proper motion (μ)RA: −357.855  mas/yr [1]
Dec.: −250.604  mas/yr [1]
Parallax (π)32.0547 ± 0.0415  mas [1]
Distance 101.7 ± 0.1  ly
(31.20 ± 0.04  pc)
Absolute magnitude  (MV)+3.80 [8]
B
Radial velocity (Rv)18.33±0.39 [9]  km/s
Proper motion (μ)RA: −350.120  mas/yr [3]
Dec.: −252.474  mas/yr [3]
Parallax (π)32.0177 ± 0.0193  mas [3]
Distance 101.87 ± 0.06  ly
(31.23 ± 0.02  pc)
Details
A
Mass 1.15±0.16 [10]   M☉
Radius 1.49±0.07 [11]   R☉
Luminosity 2.605±0.006 [1]   L☉
Surface gravity (log g)4.11±0.03 [12]   cgs
Temperature 6,059+96
−59 [13]   K
Metallicity [Fe/H]−0.34±0.06 [14]   dex
Rotational velocity (v sin i)<5 [15]  km/s
Age 7.55+0.62
−0.85 [12]   Gyr
Other designations
WDS J20217-5000AB [16]
A: 86 G. Telescopii [17] , CD–50°12929, CPD−50°11341, FK5  3630, GC  28291, GJ  9691, HD  193307, HIP  100412, HR  7766, SAO  246546 [16]
B: WT 703
Database references
SIMBAD A
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, [2] 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, [1] but it is receding with a heliocentric radial velocity of 16.9  km/s . [7] At its current distance, HD 193307's brightness is diminished by 0.18 magnitudes due to extinction from interstellar dust [18] and it has an absolute magnitude of +3.80. [8] HD 193307 has a relatively high proper motion, moving at a rate of 437 mas/yr. [19]

There has been disagreements in the stellar classification of the object. Two sources give a class of F9 V, [5] 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, [20] 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. [21]

The accepted class for HD 193307 is F9 V. [5] The object's current luminosity is 1.49 magnitudes above the ZAMS, indicating that HD 193307 is somewhat evolved. [22] has 1.15 times the Sun's mass and a slightly enlarged radius of 1.49  R☉. [11] It radiates 2.61 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,059  K , [13] which gives it the typical whitish-yellow hue of a late F-type star. At the age of 7.55 billion years, [12] 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) [14] and it spins slowly with a projected rotational velocity lower than 5  km/s . [15]

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. [4] WT 703 is located around the same distance as HD 193307 and it has a similar proper motion.

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<span class="mw-page-title-main">HD 27245</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">HD 24479</span> Star in the constellation Camelopardalis

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HD 63399 is an orange hued star located in the southern constellation Puppis, the poop deck. It has an apparent magnitude of 6.45, placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 445 light years distant. It appears to be receding with a spectroscopic radial velocity of 28.5 km/s. At its current distance, HD 63399 is diminished by 0.29 magnitudes due to interstellar dust.

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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HD 193373 is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21, placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant and it is currently receding with a heliocentric radial velocity of 22.7 km/s.

HD 182509, also designated as HR 7370, is an orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.69, making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 635 light years. It has a poorly constrained heliocentric radial velocity of −5 km/s, indicating that it is drifting towards the Solar System.

HD 208741, also known as HR 8380, is a yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.91, making it faintly visible to the naked eye. Parallax measurements place it at a distance of 211 light years, and it is currently receding with a heliocentric radial velocity of 8 km/s.

HD 33519, also known as HR 1682, is a probable spectroscopic binary located in the southern circumpolar constellation Mensa. It is one of the stars near the limit of naked eye visibility, having an apparent magnitude of 6.28. The system is relatively far at a distance of 940 light years but is approaching with a heliocentric radial velocity of −2.5 km/s. However, this value is poorly constrained.

HD 37289, also known as HR 1916, is a solitary, orange hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.61, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 308 light years distant. It appears to be approaching the Sun, having a heliocentric radial velocity of −20.7 km/s.

<span class="mw-page-title-main">HD 22764</span> Double star; Camelopardalis

HD 22764, also known as HR 1112, is an orange hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.78, allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,770 light years based on Gaia DR3 parallax measurements but is approaching the Solar System with a heliocentric radial velocity of −12.5 km/s. At its current distance, HD 22764's brightness is diminished by 0.66 magnitudes due to interstellar dust.

<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">HD 187420/187421</span> Binary star in the constellation Telescopium

HD 187420 and HD 187421, are the components of a binary star located in the southern constellation Telescopium. Gaia DR3 parallax measurements place the stars at a distance of 407 and 414 light years respectively. The two are separated by 23″, and they are approaching the Solar System with heliocentric radial velocities of −17.9 km/s and −21.5 km/s respectively.

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.
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