HD 110432

HD 110432
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 42m 50.2656s[1]
Declination −63° 03′ 31.048″[1]
Apparent magnitude (V) 5.316[2]
Characteristics
Spectral type B1IVe[3]
U−B color index −0.82[4]
B−V color index +0.27[4]
Variable type γ Cas
Astrometry
Radial velocity (Rv)+35[5] km/s
Proper motion (μ) RA: −13.32 mas/yr
Dec.: −3.47 mas/yr
Parallax (π)3.32 ± 0.56[1] mas
Distanceapprox. 1,000 ly
(approx. 300 pc)
Details
Mass9.6[3] M☉
Surface gravity (log g)3.5–3.9[3] cgs
Temperature22,510–25,000[3] K
Rotational velocity (v sin i)300–400[3] km/s
Other designations
BZ Cru, HR 4830, CD-62 671, HD 110432, GCTP, SAO 252002, FK5 3015, HIP 62027.[2]

HD 110432 is a Be star in the constellation Crux, behind the southern Coalsack Nebula. It has a stellar classification of B1IVe, which means it is a subgiant star of class B that displays emission lines in its spectrum. This is a variable star of the Gamma Cassiopeiae type, indicating it is a shell star with a circumstellar disk of gas about the equator. It is not known to be a member of a binary system, although it is probably a member of the open cluster NGC 4609. This star is moderately luminous in the X-ray band, with a variable energy emission of 1032–33 erg s−1 in the range 0.2−12 keV. The X-ray emission may be caused by magnetic activity, or possibly by accretion onto a white dwarf companion.[3]

References

  1. ↑ 1.0 1.1 1.2 Perryman, M. A. C. et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
  2. ↑ 2.0 2.1 "HR 4830 -- Be Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-12-09.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lopes de Oliveira, R. et al. (November 2007). "On the X-ray and optical properties of the Be star HD 110432: a very hard-thermal X-ray emitter". Astronomy and Astrophysics 474 (3): 983–996. arXiv:astro-ph/0701767. Bibcode:2007A&A...474..983L. doi:10.1051/0004-6361:20077295.
  4. ↑ 4.0 4.1 Cousins, A. W. J. (1973). "UBV photometry of some southern stars". Monthly Notes of the Astronomical Society of Southern Africa 32: 11. Bibcode:1973MNSSA..32...11C.
  5. ↑ 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. Retrieved 2009-09-10.