HD 170642

Last updated
HD 170642
Corona Australis constellation map.svg
Red circle.svg
Location of HD 170642 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 32m 21.33140s [1]
Declination −39° 42′ 14.4023″ [1]
Apparent magnitude  (V)5.16±0.01 [2]
Characteristics
Spectral type A3 V [3] or A3 Van [4]
B−V color index +0.08 [5]
Astrometry
Radial velocity (Rv)−6±4.2 [6]  km/s
Proper motion (μ)RA: +32.47  mas/yr [1]
Dec.: −37.47  mas/yr [1]
Parallax (π)14.23 ± 0.23  mas [1]
Distance 229 ± 4  ly
(70 ± 1  pc)
Absolute magnitude  (MV)+0.93 [7]
Details
Mass 2.25 [8]   M☉
Radius 2.59±0.13 [9]   R☉
Luminosity 32.6 [10]   L☉
Surface gravity (log g)3.96 [11]   cgs
Temperature 8,938±161 [12]   K
Metallicity [Fe/H]+0.24 [11]   dex
Rotational velocity (v sin i)177±1 [13]  km/s
Age 480 [8]   Myr
Other designations
13 G. Coronae Australis [14] , CD−39°12696, CPD−39°8114, GC  25285, HD  170642, HIP  90887, HR  6942, SAO  210277 [15]
Database references
SIMBAD data

HD 170642, also designated as HR 6942 or rarely 13 G. Coronae Australis, is a single star [16] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white hued star with an apparent magnitude of 5.16. [2] The object is located relatively close at a distance of 229 light years based on Hipparcos parallax measurements, [1] but it is approaching the Solar System with a somewhat constrained heliocentric radial velocity of −6  km/s . [6] At its current distance, HD 170642's brightness is diminished by 0.28 magnitudes due to interstellar dust. [17] It has an absolute magnitude of +0.93. [7]

This is an ordinary A-type main-sequence star with a stellar classification of A3 V. [3] Other sources include broad/nebulous absorption lines due to rapid rotation. [18] [4] It has 2.25 times the mass of the Sun and is estimated to be 480 million years old. [8] HD 170642 has a radius of 2.59  R☉. [9] When combined with an effective temperature of 8,938  K , [12] it radiates 32.6 times the luminosity of the Sun [10] from its photosphere. The star is metal enriched, having an iron abundance 74% greater than the Sun's. [11] Like many hot stars HD 170642 spins rapidly, having a projected rotational velocity of 177  km/s . [13]

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<span class="mw-page-title-main">HD 197630</span> Star in the constellation of Microscopium

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

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<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

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<span class="mw-page-title-main">HD 23005</span> Star in Camelopardlis

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<span class="mw-page-title-main">HD 170521</span> Distant K-type giant; Corona Australis

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References

  1. 1 2 3 4 5 6 van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi: 10.1051/0004-6361:20078357 . eISSN   1432-0746. ISSN   0004-6361. Hipparcos record for this source at VizieR.
  2. 1 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. 1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  4. 1 2 Gray, R. O.; Garrison, R. F. (July 1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". The Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi: 10.1086/191349 . eISSN   1538-4365. ISSN   0067-0049.
  5. ↑ Lake, R. (1965). "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)". Monthly Notes of the Astronomical Society of South Africa. 24: 41. Bibcode:1965MNSSA..24...41L. ISSN   0024-8266.
  6. 1 2 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. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  7. 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.
  8. 1 2 3 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146 . eISSN   1538-4357.
  9. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". 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.
  10. 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x . eISSN   1365-2966. ISSN   0035-8711.
  11. 1 2 3 Erspamer, D.; North, P. (28 January 2003). "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs". Astronomy & Astrophysics. 398 (3): 1121–1135. arXiv: astro-ph/0210065 . Bibcode:2003A&A...398.1121E. doi: 10.1051/0004-6361:20021711 . eISSN   1432-0746. ISSN   0004-6361.
  12. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  13. 1 2 Díaz, C. G.; González, J. F.; Levato, H.; Grosso, M. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv: 1012.4858 . Bibcode:2011A&A...531A.143D. doi: 10.1051/0004-6361/201016386 . eISSN   1432-0746. ISSN   0004-6361.
  14. ↑ 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.
  15. ↑ "HD 170642". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 25, 2022.
  16. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  17. ↑ 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.
  18. ↑ Evans, D. S. (1966). "Fundamental data for Southern stars (6th list)". Royal Greenwich Observatory Bulletins. 110: 185. Bibcode:1966RGOB..110..185E.
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