Astronomy:Zeta Chamaeleontis

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Short description: Variable star in the constellation Chamaeleon
Not to be confused with Z Chamaeleontis.
ζ Chamaeleontis
Location of ζ Chamaeleontis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Chamaeleon[1]
Right ascension  09h 33m 53.37537s[2]
Declination −80° 56′ 28.5287″[2]
Apparent magnitude (V) 5.07[1] (5.06 - 5.17)[3]
Characteristics
Evolutionary stage main sequence[2]
Spectral type B5V[1]
Variable type eclipsing[4]+ELL[5]
Astrometry
Radial velocity (Rv)−42.0±4.2 km/s
Proper motion (μ) RA: −34.582[2] mas/yr
Dec.: +13.564[2] mas/yr
Parallax (π)6.0043 ± 0.1134[2] mas
Distance540 ± 10 ly
(167 ± 3 pc)
Absolute magnitude (MV)−1.15[1]
Details
Mass3.12[6] M☉
Radius4.75[7] R☉
Luminosity522[8] L☉
Surface gravity (log g)3.55[6] cgs
Temperature15,655[9] K
Metallicity [Fe/H]−0.31[6] dex
Rotational velocity (v sin i)103[10] km/s
Age184[11] Myr
Other designations
CPD−80°365, HD 83979, HIP 46928, HR 3860, SAO 258538[12]
Database references
SIMBADdata

Zeta Chamaeleontis is a binary star system located in the constellation Chamaeleon. Its name is a Bayer designation that is Latinized from ζ Chamaeleontis, and abbreviated Zet Cha or ζ Cha. This is a 5th magnitude star, faintly visible to the naked eye under good observing conditions. Based on parallax measurements, it is located around 540 light-years distant.

Light curve for Zeta Chamaeleontis, plotted from TESS data[13]

South African Astronomer A.W.J. Cousins noted ζ Cha to vary between magnitudes 5.06 and 5.17 in 1960.[14] It was classified as a Beta Cephei variable in the Hipparcos and Tycho Catalogues (ESA 1997), with a period of 1.07 days,[15] before being reclassified as a slowly pulsating B star in the 2011 version.[16] 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]

This is classified as a B5V main sequence, 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. It shines with a luminosity approximately 522 times that of the Sun and has a effective temperature of 15,655 K.

References

  1. ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  4. ↑ 4.0 4.1 IJspeert, L. W. et al. (August 2021). "An all-sky sample of intermediate- to high-mass OBA-type eclipsing binaries observed by TESS". Astronomy & Astrophysics 652: A120. doi:10.1051/0004-6361/202141489. Bibcode: 2021A&A...652A.120I. 
  5. ↑ 5.0 5.1 "Zeta Cha". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=9399. 
  6. ↑ 6.0 6.1 6.2 Anders, F. et al. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. Bibcode: 2019A&A...628A..94A. 
  7. ↑ Kervella, Pierre et al. (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. Bibcode: 2022A&A...657A...7K. 
  8. ↑ McDonald, I. et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M. 
  9. ↑ Cardiel, Nicolás et al. (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. doi:10.1093/mnras/stab997. Bibcode: 2021MNRAS.504.3730C. 
  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. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G. 
  12. ↑ "zet Cha". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet+Cha. 
  13. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  14. ↑ Cousins, A.W.J. (1960). "New Bright Variable Stars". Monthly Notes of the Astronomical Society of Southern Africa 19: 56. Bibcode: 1960MNSSA..19...56C. 
  15. ↑ ESA (1997). The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission. 1200. ISBN 9290923997. Bibcode: 1997ESASP1200.....E. 
  16. ↑ Dubath, P. et al. (2011). "Random forest automated supervised classification of Hipparcos periodic variable stars". Monthly Notices of the Royal Astronomical Society 414 (3): 2602–17. doi:10.1111/j.1365-2966.2011.18575.x. Bibcode: 2011MNRAS.414.2602D. 



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