Astronomy:HD 110432
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 1,370 ± 70 ly (420 ± 20 pc) |
| Absolute magnitude (MV) | −2.56[6] |
| Details | |
| Mass | 9.6[3] M☉ |
| Radius | 6.5±1.2[7] R☉ |
| Luminosity | 1,153[1] L☉ |
| 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.[8] | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Samus, N. N. 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lopes de Oliveira, R. (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. doi:10.1051/0004-6361:20077295. Bibcode: 2007A&A...474..983L.
- ↑ 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.
- ↑ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". University of Toronto: International Astronomical Union. Bibcode: 1967IAUS...30...57E.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ Stee, Ph; Meilland, A.; Bendjoya, Ph.; Millour, F.; Smith, M.; Spang, A.; Duvert, G.; Hofmann, K. -H. et al. (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. doi:10.1051/0004-6361/201220302. Bibcode: 2013A&A...550A..65S.
- ↑ "HR 4830 -- Be Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+4830.
- ↑ Sarty, Gordon E.; Pilecki, Bogumil; Reichart, Daniel E.; Ivarsen, Kevin M.; Haislip, Joshua B.; Nysewander, Melissa C.; LaCluyze, Aaron P.; Johnston, Helen M. et al. (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. Bibcode: 2011RAA....11..947S. https://ui.adsabs.harvard.edu/abs/2011RAA....11..947S. Retrieved 17 December 2021.
- ↑ Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
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