HD 176425
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]
Distance358 ± 2 ly
(109.8 ± 0.5 pc)
Absolute magnitude (MV)+0.75[6]
Details
Mass2.63+0.38
−0.30[7] M☉
Radius2.19±0.11[8] R☉
Luminosity50.8+0.6
−0.7[1] L☉
Surface gravity (log g)4.23+0.05
−0.07[7] cgs
Temperature10,163[9] K
Metallicity [Fe/H]−0.10[10] dex
Age286±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
SIMBADdata

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]

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 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.
  6. 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.
  7. 1 2 3 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.
  8. 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.
  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. Oxford University Press (OUP). 345 (1): 97–99. Bibcode:2003MNRAS.345...97G. doi:10.1046/j.1365-8711.2003.06957.x. ISSN 0035-8711. S2CID 122407792.
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