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Zeta Octantis

January 01, 1970

Zeta Octantis, Latinized from ζ Octantis, is a solitary,[16] yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.42,[2] making it faintly visible to the naked eye under ideal conditions. The star is located relatively close at a distance of only 156 light-years based on Gaia DR3 parallax measurements,[1] but is drifting closer with a radial velocity of −3.6 km/s.[6] At its current distance, Zeta Octantis' brightness is diminished by 0.25 magnitudes due to interstellar dust.[17]

ζ Octantis
Location of ζ Octantis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 08h 56m 40.97572s[1]
Declination −85° 39′ 47.3476″[1]
Apparent magnitude (V) 5.42±0.01[2]
Characteristics
Spectral type A8/9 IV[3] or F0 III[4]
U−B color index +0.07[5]
B−V color index +0.31[5]
Astrometry
Radial velocity (Rv)−3.6±2[6] km/s
Proper motion (μ) RA: −117.699 mas/yr[1]
Dec.: +33.964 mas/yr[1]
Parallax (π)20.9964 ± 0.0776 mas[1]
Distance155.3 ± 0.6 ly
(47.6 ± 0.2 pc)
Absolute magnitude (MV)+1.95[7]
Details
Mass2.06±0.40[8] M☉
Radius2.25±0.11[9] R☉
Luminosity12.63±0.09[1] L☉
Surface gravity (log g)4.04±0.28[8] cgs
Temperature7,063±325[10] K
Metallicity [Fe/H]−0.36[11] dex
Rotational velocity (v sin i)115[12] km/s
Age1.25[13] Gyr
Other designations
ζ Oct, 9 G. Octantis[14], CPD−85°183, FK5 918, GC 12580, HD 79837, HIP 43908, HR 3678, SAO 258515[15]
Database references
SIMBADdata

This s an evolved A-type star with a stellar classification of A8/9 IV.[3] David S. Evans and colleagues, however, give it a classification of F0 III,[4] which suggests it is already an evolved giant star. It has double the Sun's mass,[8] and 2.25 times the Sun's radius.[9] It radiates around 13 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,063 K.[10] Zeta Octantis is estimated to be 1.25 billion years olds based on stellar evolution models by Trevor J. David and Lynne A. Hillenbrand.[13] It has a low metallicity, having only 44% the abundance of heavy metals compared to the Sun.[11] Despite its advanced age, the object spins rapidly with a projected rotational velocity of 115 km/s,[12] resulting in an oblate shape with a equatorial bulge 11% larger than the polar radius.[18]

References edit

  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 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.
  3. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
  4. ^ a b Evans, D. S.; Menzies, A.; Stoy, R. H. (1 December 1959). "Fundamental Data for Southern Stars (Second List)". Monthly Notices of the Royal Astronomical Society. 119 (6): 638–647. Bibcode:1959MNRAS.119..638E. doi:10.1093/mnras/119.6.638. eISSN 1365-2966. ISSN 0035-8711.
  5. ^ a b Mallama, A. (December 2014). "Sloan Magnitudes for the Brightest Stars". Journal of the American Association of Variable Star Observers (JAAVSO). 42 (2): 443. Bibcode:2014JAVSO..42..443M. ISSN 0271-9053.
  6. ^ a b Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
  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 c Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. eISSN 1538-3881.
  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 Bai, Yu; Liu, JiFeng; Bai, ZhongRui; Wang, Song; Fan, DongWei (2 August 2019). "Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release". The Astronomical Journal. 158 (2): 93. arXiv:1906.09695. Bibcode:2019AJ....158...93B. doi:10.3847/1538-3881/ab3048. eISSN 1538-3881.
  11. ^ a b Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711.
  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.
  13. ^ a b 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.
  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. ^ "Zeta Octantis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 7, 2022.
  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.
  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.
  18. ^ 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.

January 01, 1970
zeta, octantis, latinized, from, octantis, solitary, yellowish, white, hued, star, located, southern, circumpolar, constellation, octans, apparent, magnitude, making, faintly, visible, naked, under, ideal, conditions, star, located, relatively, close, distance. Zeta Octantis Latinized from z Octantis is a solitary 16 yellowish white hued star located in the southern circumpolar constellation Octans It has an apparent magnitude of 5 42 2 making it faintly visible to the naked eye under ideal conditions The star is located relatively close at a distance of only 156 light years based on Gaia DR3 parallax measurements 1 but is drifting closer with a radial velocity of 3 6 km s 6 At its current distance Zeta Octantis brightness is diminished by 0 25 magnitudes due to interstellar dust 17 z OctantisLocation of z Octantis circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Octans Right ascension 08h 56m 40 97572s 1 Declination 85 39 47 3476 1 Apparent magnitude V 5 42 0 01 2 Characteristics Spectral type A8 9 IV 3 or F0 III 4 U B color index 0 07 5 B V color index 0 31 5 AstrometryRadial velocity Rv 3 6 2 6 km sProper motion m RA 117 699 mas yr 1 Dec 33 964 mas yr 1 Parallax p 20 9964 0 0776 mas 1 Distance155 3 0 6 ly 47 6 0 2 pc Absolute magnitude MV 1 95 7 DetailsMass2 06 0 40 8 M Radius2 25 0 11 9 R Luminosity12 63 0 09 1 L Surface gravity log g 4 04 0 28 8 cgsTemperature7 063 325 10 KMetallicity Fe H 0 36 11 dexRotational velocity v sin i 115 12 km sAge1 25 13 Gyr Other designationsz Oct 9 G Octantis 14 CPD 85 183 FK5 918 GC 12580 HD 79837 HIP 43908 HR 3678 SAO 258515 15 Database referencesSIMBADdata This s an evolved A type star with a stellar classification of A8 9 IV 3 David S Evans and colleagues however give it a classification of F0 III 4 which suggests it is already an evolved giant star It has double the Sun s mass 8 and 2 25 times the Sun s radius 9 It radiates around 13 times the luminosity of the Sun 1 from its photosphere at an effective temperature of 7 063 K 10 Zeta Octantis is estimated to be 1 25 billion years olds based on stellar evolution models by Trevor J David and Lynne A Hillenbrand 13 It has a low metallicity having only 44 the abundance of heavy metals compared to the Sun 11 Despite its advanced age the object spins rapidly with a projected rotational velocity of 115 km s 12 resulting in an oblate shape with a equatorial bulge 11 larger than the polar radius 18 References edit 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b Hog 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 amp A 355L 27H ISSN 0004 6361 a b Houk N Cowley A P 1975 University of Michigan Catalogue of two dimensional spectral types for the HD stars Volume I Declinations 90 to 53 Bibcode 1975mcts book H a b Evans D S Menzies A Stoy R H 1 December 1959 Fundamental Data for Southern Stars Second List Monthly Notices of the Royal Astronomical Society 119 6 638 647 Bibcode 1959MNRAS 119 638E doi 10 1093 mnras 119 6 638 eISSN 1365 2966 ISSN 0035 8711 a b Mallama A December 2014 Sloan Magnitudes for the Brightest Stars Journal of the American Association of Variable Star Observers JAAVSO 42 2 443 Bibcode 2014JAVSO 42 443M ISSN 0271 9053 a b Evans D S 1967 The Revision of the General Catalogue of Radial Velocities Determination of Radial Velocities and Their Applications 30 57 Bibcode 1967IAUS 30 57E 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 a b c Stassun Keivan G Oelkers Ryan J Pepper Joshua et al 20 August 2018 The TESS Input Catalog and Candidate Target List The Astronomical Journal 156 3 102 arXiv 1706 00495 Bibcode 2018AJ 156 102S doi 10 3847 1538 3881 aad050 eISSN 1538 3881 a b Kervella P Thevenin F Di Folco E Segransan D October 2004 The angular sizes of dwarf stars and subgiants Astronomy amp Astrophysics 426 1 297 307 arXiv astro ph 0404180 Bibcode 2004A amp A 426 297K doi 10 1051 0004 6361 20035930 eISSN 1432 0746 ISSN 0004 6361 a b Bai Yu Liu JiFeng Bai ZhongRui Wang Song Fan DongWei 2 August 2019 Machine learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release The Astronomical Journal 158 2 93 arXiv 1906 09695 Bibcode 2019AJ 158 93B doi 10 3847 1538 3881 ab3048 eISSN 1538 3881 a b Netopil Martin 4 May 2017 Metallicity calibrations for dwarf stars and giants in the Geneva photometric system Monthly Notices of the Royal Astronomical Society 469 3 3042 3055 arXiv 1705 00883 Bibcode 2017MNRAS 469 3042N doi 10 1093 mnras stx1077 eISSN 1365 2966 ISSN 0035 8711 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 a b David Trevor J Hillenbrand Lynne A 12 May 2015 The Ages of Early type Stars Stromgren 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 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 Zeta Octantis SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved December 7 2022 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 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 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 amp ARv 20 51V doi 10 1007 s00159 012 0051 2 eISSN 1432 0754 ISSN 0935 4956 Retrieved from https en wikipedia org w index php title Zeta Octantis amp oldid 1219786923, wikipedia, wiki, book, books, library,

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