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HD 110432 is a Be star in the south-east of Crux, behind the center of the southern hemisphere's dark 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]

A visual band light curve for BZ Crucis, adapted from Sarty et al. (2011)[9]
A visual band light curve for BZ Crucis, adapted from Sarty et al. (2011)[9]
HD 110432
Location of BZ Crucis (circled). The other star shown overlapping/underlying the dark nebula is HD 109000 (HR 4771) which is a red/brown star about half the distance to the nebula, having parallax of 12.8 ± 0.05 thus about 250 light years away[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 42m 50.2656s[1]
Declination −63° 03′ 31.048″[1]
Apparent magnitude (V) 5.24 - 5.45[2]
Characteristics
Spectral type B1IVe[3]
U−B color index −0.82[4]
B−V color index +0.27[4]
Variable type γ Cas[2]
Astrometry
Radial velocity (Rv)+35[5] km/s
Proper motion (μ) RA: −12.512[1] mas/yr
Dec.: −3.984[1] mas/yr
Parallax (π)2.3834 ± 0.1228 mas[1]
Distance1,370 ± 70 ly
(420 ± 20 pc)
Absolute magnitude (MV)−2.56[6]
Details
Mass9.6[3] M☉
Radius6.5±1.2[7] R☉
Luminosity1,153[1] L☉
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.[8]
Database references
SIMBADdata
BZ Crucis is the bright star between the open clusters NGC 4609 and Hogg 15
BZ Crucis is the bright star between the open clusters NGC 4609 and Hogg 15

Distance


The distance of 388 pc published in the 2007 new Hipparcos reduction is over twice the distance of the Coalsack Nebula.[10] The distance from Gaia Data Release 2 is even further at 420 pc.[1]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  3. 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. S2CID 14593244.
  4. 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 (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E.
  6. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  7. Stee, Ph; Meilland, A.; Bendjoya, Ph.; Millour, F.; Smith, M.; Spang, A.; Duvert, G.; Hofmann, K. -H.; Massi, F. (2013). "Evidence of an asymmetrical Keplerian disk in the Brγ and He I emission lines around the be star HD 110432". Astronomy and Astrophysics. 550: A65. arXiv:1301.2877. Bibcode:2013A&A...550A..65S. doi:10.1051/0004-6361/201220302. S2CID 11256230.
  8. "HR 4830 -- Be Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-12-09.
  9. Sarty, Gordon E.; Pilecki, Bogumil; Reichart, Daniel E.; Ivarsen, Kevin M.; Haislip, Joshua B.; Nysewander, Melissa C.; LaCluyze, Aaron P.; Johnston, Helen M.; Shobbrook, Robert R.; Kiss, László L.; Wu, Kinwah (August 2011). "Photometric observations of three high mass X-ray binaries and a search for variations induced by orbital motion". Research in Astronomy and Astrophysics. 11 (8): 947–964. doi:10.1088/1674-4527/11/8/007. Retrieved 17 December 2021.
  10. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.


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