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
Distance360 ± 20 ly
(111 ± 7 pc)
Details
Temperature3,832[5] K
Rotational velocity (v sin i)115[6] km/s
Age7 × 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. 1 2 3 4 5 Perryman, M. A. C.; et al. (1997). "The Hipparcos Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
  2. 1 2 3 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 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. Bibcode: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): 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. 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.


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