HD 110432

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

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]
  1. ^ a b c d e f g Cite error: The named reference dr2 was invoked but never defined (see the help page).
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  3. ^ a b c d e f Cite error: The named reference aaa474_3_983 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference mnrassa32 was invoked but never defined (see the help page).
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  6. ^ Cite error: The named reference xhip was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference stee was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Sarty was invoked but never defined (see the help page).