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V701 Coronae Australis
Location of HD 168592 (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Corona Australis
Right ascension 19h 03m 17.69619s [1]
Declination −38° 15′ 11.3335″ [1]
Apparent magnitude (V) 5.69 to 5.73 [2]
Characteristics
Spectral type F2 III/IV [3] or F0 IIIn [4]
B−V color index +0.32 [5]
Variable type δ Scuti [2]
Astrometry
Radial velocity (Rv)4±7.4 [6] km/s
Proper motion (μ) RA: +12.794  mas/ yr [1]
Dec.: +14.271  mas/ yr [1]
Parallax (π)15.2952 ± 0.0559  mas [1]
Distance213.2 ± 0.8  ly
(65.4 ± 0.2  pc)
Absolute magnitude (MV)+1.55 [7]
Details
Mass1.83+0.07
−0.06 [8]  M☉
Radius2.85±0.14 [9]  R☉
Luminosity17.5+0.2
−0.1 [1]  L☉
Surface gravity (log g)3.75±0.12 [10]  cgs
Temperature7,046±240 [11]  K
Metallicity [Fe/H]−0.21 [12]  dex
Rotational velocity (v sin i)265 [13] km/s
Age1.25 [11]  Gyr
Other designations
40 G. Coronae Australis [14], V701 CrA, CD−38°13300, CPD−38°7685, GC 26177, HD 176723, HIP 93552, HR 7197, SAO 210859 [15]
Database references
SIMBAD data

V701 Coronae Australis (HD 176723; HR 7197; 40 G. Coronae Australis), or simply V701 CrA, is a solitary, [16] yellowish-white hued variable star located in the southern constellation Corona Australis. It has an average apparent magnitude of 5.72, [17] making it faintly visible to the naked eye under ideal conditions. The object is located relatively close at a distance of 213 light-years based on Gaia DR3 parallax measurements, [1] and it is currently receding with a poorly constrained heliocentric radial velocity of 4  km/s. [6] At its current distance, V701 CrA's brightness is diminished by a quarter of a magnitude due to extinction [18] and it has an absolute magnitude of +1.55. [7]

A light curve for V701 Coronae Australis, plotted from TESS data [19]

The object was first suspected to be variable in 1990. The variations matched that of δ Scuti variables. [20] Three years later, it was confirmed to be variable and was given the variable star designation V701 Coronae Australis. [21] It ranges from magnitude 5.69 to 5.73 [2] within 3.25 hours. [22]

V701 CrA has a stellar classification of F2 III/IV, [3] indicating that it is an evolved F-type star with the blended luminosity class of a subgiant and giant star. It has also been given a class of F0 IIIn, [4] indicating broad or nebulous absorption lines due to rapid rotation. It has 1.83 times the mass of the Sun [8] and a slightly enlarged radius of 2.85  R☉. [9] It radiates 17.5 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 7,046  K. [11] The star spins rapidly with a projected rotational velocity of 265  km/s, [13] which causes it to have an equatorial bulge that is 26% larger than the poles. [23] It is metal deficient with an iron abundance 62% that of the Sun ([Fe/H] = −0.21) [12] and it is estimated to be 1.25 billion years old. [11] V701 CrA was considered to be a chemically peculiar star and was given a class of FpSr. Its peculiarity is now considered to be doubtful. [24]

References

  1. ^ a b c d e f g 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. ^ a b c Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. eISSN  1562-6881. ISSN  1063-7729. S2CID  125853869.
  3. ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode: 1982mcts.book.....H.
  4. ^ a b Evans, D. S.; Laing, J. D.; Menzies, A.; Stoy, R. H. (1964). "Fundamental data for southern stars (fifth list)". Royal Greenwich Observatory Bulletins. 85: 207–224. Bibcode: 1964RGOB...85..207E.
  5. ^ 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.
  6. ^ a b Holmberg, J.; Nordström, B.; Andersen, J. (6 August 2007). "The Geneva-Copenhagen survey of the Solar neighbourhood II". Astronomy & Astrophysics. 475 (2): 519–537. arXiv: 0707.1891. Bibcode: 2007A&A...475..519H. doi: 10.1051/0004-6361:20077221. eISSN  1432-0746. ISSN  0004-6361.
  7. ^ a b 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. ^ a b 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.
  9. ^ a b 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. ^ Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. ISSN  0004-6361. S2CID  13365201.
  11. ^ a b c d 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.
  12. ^ a b Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv: 1103.4651. Bibcode: 2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276. eISSN  1432-0746. ISSN  0004-6361. S2CID  56118016.
  13. ^ a b Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode: 1953ApJ...118..285H. doi: 10.1086/145751. eISSN  1538-4357. ISSN  0004-637X. S2CID  120328179.
  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. ^ "V* V701 Coronae Australis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 22, 2023.
  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. ^ 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.
  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. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 24 May 2023.
  20. ^ Lampens, P.; Rufener, F. (April 1990). "Study of delta Scuti stars in the Geneva photometric system. I. New photometric data and period analysis for nine stars". Astronomy and Astrophysics Supplement Series. 83: 145–182. Bibcode: 1990A&AS...83..145L. ISSN  0365-0138. S2CID  116966422.
  21. ^ Kazarovets, E. V.; Samus, N. N.; Goranskij, V. P. (February 1993). "The 71st Name-List of Variable Stars". Information Bulletin on Variable Stars. 3840: 1. Bibcode: 1993IBVS.3840....1K. ISSN  0374-0676.
  22. ^ Rodriguez, E.; Lopez de Coca, P.; Rolland, A.; Garrido, R.; Costa, V. (July 1994). "δ Scuti stars: a new revised list". Astronomy and Astrophysics Supplement Series. 106: 21–28. Bibcode: 1994A&AS..106...21R. ISSN  0365-0138. S2CID  124872236.
  23. ^ van Belle, Gerard T. (14 March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv: 1204.2572. Bibcode: 2012A&ARv..20...51V. doi: 10.1007/s00159-012-0051-2. eISSN  1432-0754. ISSN  0935-4956.
  24. ^ Renson, P.; Manfroid, J. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics. 498 (3): 961–966. Bibcode: 2009A&A...498..961R. doi: 10.1051/0004-6361/200810788. eISSN  1432-0746. ISSN  0004-6361. S2CID  55849045.
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