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Zeta Chamaeleontis

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Not to be confused with Z Chamaeleontis .
ζ Chamaeleontis
Location of ζ Chamaeleontis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Chamaeleon
Right ascension 09 h 33 m 53.37537 s [1]
Declination ?80° 56′ 28.5287″ [1]
Apparent magnitude  (V) 5.07 [2] (5.06 - 5.17) [3]
Characteristics
Spectral type B5V [2]
Variable type eclipsing [4] + ELL [5]
Astrometry
Radial velocity (R v ) ?42.0 ± 4.2  km/s
Proper motion (μ) RA:  ?34.582 [1]   mas / yr
Dec.:  +13.564 [1]   mas / yr
Parallax (π) 6.0043 ± 0.1134  mas [1]
Distance 540 ± 10  ly
(167 ± 3  pc )
Absolute magnitude  (M V ) ?1.15 [2]
Details
Mass 3.12 [6]   M ☉
Radius 4.75 [7]   R ☉
Luminosity 522 [8]   L ☉
Surface gravity (log  g ) 3.55 [6]   cgs
Temperature 15,655 [9]   K
Metallicity [Fe/H] ?0.31 [6]   dex
Rotational velocity ( v  sin  i ) 103 [10]  km/s
Age 184 [11]   Myr
Other designations
CPD ?80°365, HD  83979, HIP  46928, HR  3860, SAO  258538
Database references
SIMBAD data
Light curve for Zeta Chamaeleontis, plotted from TESS data [12]

Zeta Chamaeleontis , Latinized from ζ Chamaeleontis, is a star located in the constellation Chamaeleon . Located around 540 light-years distant, it shines with a luminosity approximately 522 times that of the Sun and has a surface temperature of 15,655 K.

South African Astronomer A.W.J. Cousins noted ζ Cha to vary between magnitudes 5.06 and 5.17 in 1960. [13] It was classified as a Beta Cephei variable in the Hipparcos and Tycho Catalogues (ESA 1997), with a period of 1.07 days, [14] before being reclassified as a slowly pulsating B star in the 2011 version. [15] It is now known to be an eclipsing binary star, with a period of 2.7 days, [4] with continuous variation through the whole cycle due to the ellipsoidal shape of the component stars. [5]

It is a B5V main sequence star with an effective temperature of 15,655  K , an absolute magnitude of ?1.15 and a mass of 3.1 solar masses , although the properties are evaluated treating the system as a single star.

References [ edit ]

  1. ^ a b c d e 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 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv : 1108.4971 . Bibcode : 2012AstL...38..331A . doi : 10.1134/S1063773712050015 . S2CID   119257644 .
  3. ^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports . 5.1. 61 (1): 80?88. Bibcode : 2017ARep...61...80S . doi : 10.1134/S1063772917010085 . S2CID   125853869 .
  4. ^ a b IJspeert, L. W.; Tkachenko, A.; Johnston, C.; Garcia, S.; De Ridder, J.; Van Reeth, T.; Aerts, C. (August 2021). "An all-sky sample of intermediate- to high-mass OBA-type eclipsing binaries observed by TESS" . Astronomy & Astrophysics . 652 : A120. arXiv : 2107.10005 . Bibcode : 2021A&A...652A.120I . doi : 10.1051/0004-6361/202141489 .
  5. ^ a b "Zeta Cha" . International Variable Star Index . AAVSO . Retrieved 2023-07-27 .
  6. ^ a b c Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevi?, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gomez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics . 628 : A94. arXiv : 1904.11302 . Bibcode : 2019A&A...628A..94A . doi : 10.1051/0004-6361/201935765 . S2CID   131780028 .
  7. ^ Kervella, Pierre; Arenou, Frederic; Thevenin, Frederic (2022). "Stellar and substellar companions from Gaia EDR3" . Astronomy & Astrophysics . 657 : A7. arXiv : 2109.10912 . Bibcode : 2022A&A...657A...7K . doi : 10.1051/0004-6361/202142146 . S2CID   237605138 .
  8. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society . 427 (1): 343?57. arXiv : 1208.2037 . Bibcode : 2012MNRAS.427..343M . doi : 10.1111/j.1365-2966.2012.21873.x . S2CID   118665352 .
  9. ^ Cardiel, Nicolas; Zamorano, Jaime; Bara, Salvador; Sanchez De Miguel, Alejandro; Cabello, Cristina; Gallego, Jesus; Garcia, Lucia; Gonzalez, Rafael; Izquierdo, Jaime; Pascual, Sergio; Robles, Jose; Sanchez, Ainhoa; Tapia, Carlos (2021). "Synthetic RGB photometry of bright stars: Definition of the standard photometric system and UCM library of spectrophotometric spectra". Monthly Notices of the Royal Astronomical Society . 504 (3): 3730. arXiv : 2103.17009 . Bibcode : 2021MNRAS.504.3730C . doi : 10.1093/mnras/stab997 .
  10. ^ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G . 3244 . Bibcode : 2005yCat.3244....0G .
  11. ^ 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 . ISSN   0320-0108 . S2CID   255201789 .
  12. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute . Retrieved 25 September 2022 .
  13. ^ Cousins, A.W.J. (1960). "New Bright Variable Stars". Monthly Notes of the Astronomical Society of Southern Africa . 19 : 56. Bibcode : 1960MNSSA..19...56C .
  14. ^ ESA (1997). The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission . Vol. 1200. Bibcode : 1997ESASP1200.....E . ISBN   9290923997 . {{ cite book }} : |journal= ignored ( help )
  15. ^ Dubath, P.; Rimoldini, L.; Suveges, M.; Blomme, J.; Lopez, M.; Sarro, L. M.; De Ridder, J.; Cuypers, J.; Guy, L.; Lecoeur, I.; Nienartowicz, K.; Jan, A.; Beck, M.; Mowlavi, N.; De Cat, P.; Lebzelter, T.; Eyer, L. (2011). "Random forest automated supervised classification of Hipparcos periodic variable stars". Monthly Notices of the Royal Astronomical Society . 414 (3): 2602?17. arXiv : 1101.2406 . Bibcode : 2011MNRAS.414.2602D . doi : 10.1111/j.1365-2966.2011.18575.x . S2CID   118560311 .
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