Astronomy:HD 110956
280px Star map shows star position on the northern edge of the constellation Crux | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Crux[1] |
| Right ascension | 12h 46m 22.71460s[2] |
| Declination | −56° 29′ 19.7366″[2] |
| Apparent magnitude (V) | 4.62[1] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | B2/3V[4] |
| U−B color index | −0.61[1] |
| B−V color index | −0.150±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | 15.5[5] km/s |
| Proper motion (μ) | RA: −33.03[2] mas/yr Dec.: −14.84[2] mas/yr |
| Parallax (π) | 8.48 ± 0.22[2] mas |
| Distance | 385 ± 10 ly (118 ± 3 pc) |
| Absolute magnitude (MV) | −1.05[6] |
| Details | |
| Mass | 6.5[7] M☉ |
| Luminosity | 1,538[7] L☉ |
| Surface gravity (log g) | 4.24[8] cgs |
| Temperature | 19,055[7] K |
| Rotational velocity (v sin i) | 22±3[9] km/s |
| Age | 12.7[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 110956 is a single[11] star in the southern constellation of Crux. It is faintly visible to the naked eye with an apparent visual magnitude of 4.62.[1] The distance to this star is approximately 385 light years based on parallax and it is drifting further away with a radial velocity of 15.5 km/s.[5] It is a probable member of the Lower Centaurus–Crux subgroup of the Scorpius–Centaurus association.[12]
This is a B-type main-sequence star with a stellar classification of B2/3V.[4] It is a young star, estimated to be about 12.7 million years old,[10] with 6.5 times the mass of the Sun.[7] The star is spinning with a projected rotational velocity of 22 km/s.[9] It is radiating around 1,500 times the luminosity of the Sun from its photosphere at an effective temperature of 19,055 K.[7]
There are multiple visual companions positioned near HD 110956. The brightest of these, with a visual magnitude of 8.93, is located at an angular separation of 51.1″ along a position angle of 166°, as of 2020. This companion was reported by J. F. W. Herschel in 1834.[13] It is an α2 CVn variable with the designation BR Cru.[14]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ Zari, E.; Hashemi, H.; Brown, A. G. A.; Jardine, K.; De Zeeuw, P. T. (2018). "3D mapping of young stars in the solar neighbourhood with Gaia DR2". Astronomy and Astrophysics 620: A172. doi:10.1051/0004-6361/201834150. Bibcode: 2018A&A...620A.172Z.
- ↑ 4.0 4.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode: 1975mcts.book.....H.
- ↑ 5.0 5.1 Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". in Batten, Alan Henry. University of Toronto: International Astronomical Union. Bibcode: 1967IAUS...30...57E.
- ↑ Kaltcheva, N. T. et al. (2014). "Massive stellar content of the Galactic supershell GSH 305+01-24". Astronomy and Astrophysics 562: A69. doi:10.1051/0004-6361/201321454. Bibcode: 2014A&A...562A..69K.
- ↑ 7.0 7.1 7.2 7.3 7.4 Quintana, Alexis L.; Wright, Nicholas J.; Martínez García, Juan (2025). "A census of OB stars within 1 KPC and the star formation and core collapse supernova rates of the Milky Way". Monthly Notices of the Royal Astronomical Society 538 (3): 1367. doi:10.1093/mnras/staf083. Bibcode: 2025MNRAS.538.1367Q.
- ↑ de Geus, E. J. et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics 216 (1–2): 44–61, Bibcode: 1989A&A...216...44D
- ↑ 9.0 9.1 Bragança, G. A. et al. (November 2012). "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk". The Astronomical Journal 144 (5): 10. doi:10.1088/0004-6256/144/5/130. 130. Bibcode: 2012AJ....144..130B.
- ↑ 10.0 10.1 Gratton, R.; Squicciarini, V.; Nascimbeni, V.; Janson, M.; Reffert, S.; Meyer, M.; Delorme, P.; Mamajek, E. E. et al. (2023). "Multiples among B stars in the Scorpius-Centaurus association". Astronomy and Astrophysics 678: A93. doi:10.1051/0004-6361/202346806. Bibcode: 2023A&A...678A..93G.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ de Zeeuw, P. T. et al. (January 1999), "A HIPPARCOS Census of the Nearby OB Associations", The Astronomical Journal 117 (1): 354–399, doi:10.1086/300682, Bibcode: 1999AJ....117..354D
- ↑ Mason, Brian D. et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
- ↑ Samus', N. N. et al. (2017). "General catalogue of variable stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
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