HD 176425

Last updated
HD 176425
Corona Australis constellation map.svg
Red circle.svg
Location of HD 176425 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 02m 08.52100s [1]
Declination −41° 54′ 37.8260″ [1]
Apparent magnitude  (V)6.21±0.01 [2]
Characteristics
Spectral type A0 V [3]
B−V color index 0.00 [4]
Astrometry
Radial velocity (Rv)−12.8±4.3 [5]  km/s
Proper motion (μ)RA: +30.557  mas/yr [1]
Dec.: −11.271  mas/yr [1]
Parallax (π)9.1110 ± 0.0417  mas [1]
Distance 358 ± 2  ly
(109.8 ± 0.5  pc)
Absolute magnitude  (MV)+0.75 [6]
Details
Mass 2.63+0.38
−0.30 [7]   M☉
Radius 2.19±0.11 [8]   R☉
Luminosity 50.8+0.6
−0.7 [1]   L☉
Surface gravity (log g)4.23+0.05
−0.07 [7]   cgs
Temperature 10,163 [9]   K
Metallicity [Fe/H]−0.10 [10]   dex
Age 286±7 [11] [12]   Myr
Other designations
38 G. Coronae Australis [13] , CD−42°13839, CPD−42°8564, GC  26164, HD  176425, HIP  93470, HR  7177, SAO  229446 [14]
Database references
SIMBAD data

HD 176425, also known as HR 7177 or rarely 38 G. Coronae Australis, is a solitary, bluish-white hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.21, [2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 358 light-years, [1] and it is currently drifting closer with a heliocentric radial velocity of −12.8  km/s . [5] At its current distance, HD 176425's brightness is diminished by an interstellar extinction factor of 0.27 magnitudes [15] and it has an absolute magnitude of +0.75. [6]

HD 176425 is an ordinary A-type main-sequence star with a stellar classification of A0 V. [3] It has been used as an unpolarized standard in the southern sky. [16] It has 2.63 times the mass of the Sun [7] and 2.19 times the radius of the Sun. [8] The object radiates 50.8 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 10,163  K . [9] HD 176425 is metal deficient with an iron abundance 79% that of the Sun ([Fe/H] = −0.10) [10] and it is estimated to be 286 million years old. [11] [12]

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<span class="mw-page-title-main">HD 170384</span> A-type dwarf; Corona Australis

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References

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  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 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  4. ↑ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. 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.
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  9. 1 2 Westin, T. N. G. (April 1985). "The local system of early type stars. Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99–134. Bibcode:1985A&AS...60...99W. ISSN   0365-0138. S2CID   119020376.
  10. 1 2 Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi: 10.1051/0004-6361/202142369 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv: 1606.09028 . Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN   1562-6873. ISSN   1063-7737. S2CID   255202762.
  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. ↑ 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.
  14. ↑ "HD 176425". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 8, 2023.
  15. ↑ 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.
  16. ↑ Gil-Hutton, R.; Benavidez, P. (October 11, 2003). "Southern stars that can be used as unpolarized standards". Monthly Notices of the Royal Astronomical Society. 345 (1). Oxford University Press (OUP): 97–99. Bibcode:2003MNRAS.345...97G. doi: 10.1046/j.1365-8711.2003.06957.x . ISSN   0035-8711. S2CID   122407792.
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