V701 Coronae Australis

V701 Coronae Australis
Observationsdata
Epok: J2000.0
StjärnbildSödra kronan
Rektascension19t 03m 17,69619s[1]
Deklination-38° 15′ 11,3335″[1]
Skenbar magnitud ()5,69-5,73)[2]
Stjärntyp
SpektraltypF2 III/IV[3] eller F0 IIIn[4]
B–V+0,32[5]
VariabeltypDelta Scuti-variabel[2]
Astrometri
Radialhastighet ()+4 ± 7,4[6] km/s
Egenrörelse (µ)RA: +12,794[1] mas/år
Dek.: +14,271[1] mas/år
Parallax ()15,2952 ± 0,0559[1]
Avstånd213,2 ± 0,8  (65,4 ± 0,2 pc)
Absolut magnitud ()+1,55[7]
Detaljer
Massa1,83 ± 0,06[8] M
Radie2,85 ± 0,14[9] R
Luminositet17,5 ± 0,1[1] L
Temperatur7 061 ± 240[10] K
Metallicitet-0,21[11] dex
Vinkelhastighet265[12] km/s
Ålder1,25 ± 5,1[10] miljarder år
Andra beteckningar
40 G Coronae Australis,[13] HD 176723, CD-38 13300, CPD-38 7685, GSC 07917-00638, HIC 93552, HIP 93552, HR 7197, 2MASS J19031770-3815113, PPM 298484, SAO 210859, TD1 23709, TYC 7917-638-1, uvby98 100176723, V701 Coronae Australis, Gaia DR2 6718702351425694848, Gaia DR3 6718702351425694848[14][15]

V701 Coranae Australis eller HD 176723, är en ensam stjärna[16] belägen i norra delen av stjärnbilden Södra kronan. Den har en högsta skenbar magnitud av ca 5,69[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 15,3 mas[2] beräknas den befinna sig på ett avstånd av ca  213 ljusår (ca  65 parsec) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 4 km/s.[6] På dess nuvarande avstånd är V701 Coronae Australis ljusstyrka minskad med 0,25 magnitud på grund av skymning av interstellärt stoft.[17]

Observation

Ljuskurva i för V701 Coronae Australis, anpassad från TESS-data.[18]

Objektet misstänktes först 1990 vara variabelt. Variationerna matchade Delta Scuti-variablerna.[19] Tre år senare bekräftades den vara variabel och fick variabelbeteckningen V701 Coronae Australis.[20] Den varierar mellan magnitud 5,69 och 5,73[2] med en variationsperiod av 3,25 timmar.[21]

Egenskaper

V701 Coronae Australis är en vit till blå stjärna av spektralklass F2 III/IV[4] vilket anger att den är en utvecklad stjärna av spektraltyp F och en blandning av underjätte och jättestjärna. Den andra klassificeringen, F0 IIIn,[4] anger att V701 Coronae Australis har breda eller diffusa absorptionslinjer i dess spektrum beroende på stjärnans snabba rotation. Den har en massa av ca 1,8 solmassor[8] och en radie av ca 2,9 solradier.[9] Den anger energi från dess fotosfär motsvarande ca 17,5 gånger solen[1] vid en effektiv temperatur av ca 7 000 K.[10] Stjärnan är metallfattig med ett järninnehåll på 62 procent a solens (Fe/H= -0,21)[11] och uppskattas ha en ålder av 1,25 miljarder år.[13] Den roterar snabbt med en projicerad rotationshastighet av 265 km/s,[12] vilket gör att den har en ekvatorialradie som är ca 26 procent större än polarradien.[22] Den ansågs vara en kemiskt säregen stjärna och fick en klass av FpSr. Dess säregenhet anses nu (2023) dock vara tveksam.[23]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, V 691 Coronae Australis, 24 maj 2023..

Noter

  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 d e] 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. 1063-7729. S2CID 125853869.
  3. ^ 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 c] 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. ^ 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. ^ [a b c] 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.
  11. ^ [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.
  12. ^ [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.
  13. ^ [a b] 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. ^ https://simbad.cds.unistra.fr/simbad/sim-id?Ident=V701+CrA. Hämtad 2024-10-25.
  15. ^ "V* V701 Coronae Australis". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 22 maj 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. ^ 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.
  18. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Hämtad 24 Mmaj 2023.
  19. ^ 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.
  20. ^ 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.
  21. ^ 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.
  22. ^ 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.
  23. ^ 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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