HD 110432

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HD 110432
Crux constellation map.png
Red circle.svg

Location of BZ Crucis (circled)
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]
Spectral type B1IVe[3]
U−B color index −0.82[4]
B−V color index +0.27[4]
Variable type γ Cas
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
Distance approx. 1,000 ly
(approx. 300 pc)
Mass 9.6[3] M
Surface gravity (log g) 3.5–3.9[3] cgs
Temperature 22,510–25,000[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]
Database references
BZ Crucis is the bright star between the open clusters NGC 4609 and Hogg 15

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, and has the variable star designation BZ Crucis. 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]


  1. ^ a b c Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ a b "HR 4830 -- Be Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-12-09. 
  3. ^ a b c d e f 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. Bibcode:2007A&A...474..983L. arXiv:astro-ph/0701767Freely accessible. doi:10.1051/0004-6361:20077295. 
  4. ^ a b 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.