HD 170384

Last updated
HD 170384
Corona Australis constellation map.svg
Red circle.svg
Location of HD 170384 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 31m 02.94877s [1]
Declination −41° 54′ 49.8025″ [1]
Apparent magnitude  (V)6.02±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type A3 V [4]
B−V color index +0.14 [5]
Astrometry
Radial velocity (Rv)−11.4±0.4 [6]  km/s
Proper motion (μ)RA: −3.406  mas/yr [1]
Dec.: −31.578  mas/yr [1]
Parallax (π)14.2387 ± 0.0341  mas [1]
Distance 229.1 ± 0.5  ly
(70.2 ± 0.2  pc)
Absolute magnitude  (MV)+1.86 [7]
Details
Mass 2.00 [8]   M☉
Radius 1.91±0.10 [9]   R☉
Luminosity 16.7+1.1
−1.0 [3]   L☉
Surface gravity (log g)4.19+0.08
−0.07 [10]   cgs
Temperature 8,694 [11]   K
Metallicity [Fe/H]−0.01 [12]   dex
Rotation 19.2  h [13]
Rotational velocity (v sin i)127±5 [13]  km/s
Age 544 [8]   Myr
Other designations
11 G. Coronae Australis [14] , CD−41°12871, CPD−41°8697, GC  25249, HD  170384, HIP  90759, HR  6931, SAO  229080 [15]
Database references
SIMBAD data

HD 170384, also known as HR 6931 or rarely 11 G. Coronae Australis, is a solitary white-hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.02, [2] making it barely visible to the naked eye, even under ideal conditions. The object is located relatively close at a distance of 229.1 light-years based on Gaia DR3 parallax measurements [1] and it is drifting closer with a heliocentric radial velocity of −11.4  km/s . [6] At its current distance, HD 170384's brightness is diminished by interstellar extinction of 0.28 magnitudes [16] and it has an absolute magnitude of +1.86. [7]

This object has a stellar classification of A3 V, indicating that it is an ordinary A-type main-sequence star. It has double the Sun's mass [8] and 1.91 times the radius of the Sun. [9] It radiates 16.7 times the luminosity of the Sun [3] from its photosphere at an effective temperature of 8,694  K . [11] HD 170384 has a near solar metallicity at [Fe/H] = −0.01 (97% solar) [12] and it is estimated to be 544 million years old, [8] having completed 45% of its main sequence lifetime. [3] Like many hot stars HD 170384 spins rapidly, having a projected rotational velocity of 127  km/s and an estimated rotation period of 19.2 hours. [13]

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<span class="mw-page-title-main">HD 174500</span> Star in the constellation of Telescopium

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<span class="mw-page-title-main">HD 170873</span> K-type giant; Telescopium

HD 170873, also known as HR 6954 or rarely 19 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.20, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 551 light years and it is currently receding with a heliocentric radial velocity of 23.8 km/s. At its current distance, HD 170873's brightness is diminished by 0.39 magnitudes due to interstellar dust, and it has an absolute magnitude of −0.31.

<span class="mw-page-title-main">HD 186756</span> K-type giant; Telescopium

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<span class="mw-page-title-main">32 Leonis Minoris</span> Star in the constellation Leo Minor

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<span class="mw-page-title-main">HD 169853</span> Am star; Corona Australis

HD 169853, also known as HR 6910 or rarely 9 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.62. Gaia DR3 parallax measurements imply a distance of 391 light years, and it is currently approaching the Solar System with a heliocentric radial velocity of −21.3 km/s. At its current distance, HD 169853's brightness is diminished by 0.36 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of +0.13.

<span class="mw-page-title-main">HD 33541</span> Spectroscopic binary; Camelopardalis

HD 33541, also known as HR 1683, is a white-hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.83, making it faintly visible to the naked eye. Gaia DR3 parallax measurements imply a distance of 358 light years and it is currently receding with a heliocentric radial velocity of 9.9 km/s. At its current distance HD 33541's brightness is diminished by 0.16 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.58.

References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 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. S2CID   17128864.
  3. 1 2 3 4 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361. S2CID   55586789.
  4. ↑ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  5. ↑ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode:1971MNSSA..30...37C. 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 4 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. S2CID   33401607.
  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. ↑ 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.
  11. 1 2 Balona, L. A. (October 7, 2019). "Evidence for spots on hot stars suggests major revision of stellar physics". Monthly Notices of the Royal Astronomical Society. Oxford University Press (OUP). 490 (2): 2112–2116. arXiv: 1910.01584 . doi: 10.1093/mnras/stz2808 . ISSN   0035-8711. S2CID   203642124.
  12. 1 2 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. eISSN   1562-6873. ISSN   1063-7737. S2CID   118345778.
  13. 1 2 3 Reiners, A.; Royer, F. (February 2004). "First signatures of strong differential rotation in A-type stars". Astronomy & Astrophysics. 415 (1): 325–329. arXiv: astro-ph/0311341 . Bibcode:2004A&A...415..325R. doi: 10.1051/0004-6361:20034175 . eISSN   1432-0746. ISSN   0004-6361. S2CID   15726297.
  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 170384". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 5, 2023.
  16. ↑ 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.
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