Zeta Crucis

Zeta Crucis
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 18m 26.2485s[1]
Declination –64° 00′ 11.055″[1]
Apparent magnitude (V) 4.04[2]
Characteristics
Spectral type B2.5V[3]
U−B color index –0.68[2]
B−V color index –0.17[2]
Astrometry
Radial velocity (Rv) +15.8[4] km/s
Proper motion (μ) RA: –33.19[1] mas/yr
Dec.: –10.38[1] mas/yr
Parallax (π) 9.03 ± 0.55[1] mas
Distance 360 ± 20 ly
(111 ± 7 pc)
Details
Temperature 3,832[5] K
Rotational velocity (v sin i) 115[6] km/s
Age 7 × 106[7] years
Other designations
HR 4679, CPD-63°2235, HD 106983, SAO 251841, HIP 60009.[8]

ζ Crucis (ζ Cru, Zeta Crucis) is a binary star in the constellation Crux. It has an apparent magnitude of 4.06m. The primary star is classified as a blue-white dwarf (spectral class B2.5 V). The secondary component is much fainter, with an apparent magnitude of 12.49.[9] ζ Crucis is located at about 360 light-years from the Sun.

References

  1. ^ a b c d e Perryman, M. A. C. et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics 323: L49–L52, Bibcode 1997A&A...323L..49P 
  2. ^ a b c Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode 1966CoLPL...4...99J. 
  3. ^ Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969). "MK Spectral Types for Bright Southern OB Stars". Astrophysical Journal 157: 313–326. Bibcode 1969ApJ...157..313H. doi:10.1086/150069. 
  4. ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. http://adsabs.harvard.edu/abs/1967IAUS...30...57E. Retrieved 2009-09-10. 
  5. ^ Gerbaldi, M.; Faraggiana, R.; Balin, N. (November 2001). "Binary systems with post-T Tauri secondaries". Astronomy and Astrophysics 379: 162–184. Bibcode 2001A&A...379..162G. doi:10.1051/0004-6361:20011298. 
  6. ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1). Bibcode 1970CoAsi.239....1B. 
  7. ^ Grosbol, P. J. (June 1978). "Space velocities and ages of nearby early-type stars". Astronomy and Astrophysics Supplement Series 32: 409–421. Bibcode 1978A&AS...32..409G. 
  8. ^ "zet Cru – Star in double system". SIMBAD (Centre de Données astronomiques de Strasbourg). http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Zeta+Cru. Retrieved 2009-09-10. 
  9. ^ Gahm, G. F.; Ahlin, P.; Lindroos, K. P. (January 1983). "A study of visual double stars with early type primaries. I - Spectroscopic results". Astronomy and Astrophysics Supplement Series 51: 143–159. Bibcode 1983A&AS...51..143G. 
Stars of Crux
Bayer