Beta Hydrae
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Hydra |
Right ascension | 11h 52m 54.52149s[2] |
Declination | −33° 54′ 29.2672″[2] |
Apparent magnitude (V) | 4.29 (combined)[3] (4.67 + 5.47)[4] |
Characteristics | |
Spectral type | B9IIIp Si[5] + ? kB8hB8HeA0VSi[6] |
U−B color index | −0.34[3] |
B−V color index | −0.100±0.003[3] |
R−I color index | −0.08[7] |
Variable type | |
Astrometry | |
Radial velocity (Rv) | −1.0±3.7[3] km/s |
Proper motion ( | RA: −56.56[2] mas/yr Dec.: +0.19[2] mas/yr |
Parallax ( | 10.53 ± 0.60 mas[2] |
Distance | 310 ± 20 ly (95 ± 5 pc) |
Absolute magnitude (MV) | −0.59[3] |
Details | |
A | |
Mass | 3.36±0.15[9] M☉ |
Radius | 3.89±0.08[10] R☉ |
Luminosity | 257+45 −38[11] L☉ |
Surface gravity (log g) | 2.52±0.03[10] cgs |
Temperature | 10,980±110[10] K |
Rotation | 2.35666±0.00002 d[12] |
Age | 178+62 −12[11] Myr |
B | |
Mass | ~3[13] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
A | |
B |
Beta Hydrae, Latinized from
The double nature of this system was first reported by English astronomer John Herschel in 1834.[16] The brighter primary, designated component A, has an average visual magnitude of 4.67, while the secondary, component B, is of magnitude 5.47. As of 2002, the secondary is located at an angular separation of 0.65 arcseconds from the primary, along a position angle of 28.5°.[4]
The brighter component is an
In 1972, M. R. Molnar found a stellar classification of B9IIIp Si for
Cultural significance[edit]
The Kalapalo people of Mato Grosso state in Brazil called this star and
References[edit]
- ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- ^ a b c d e van Leeuwen, F. (November 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
- ^ a b c d e f 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.
- ^ a b Fabricius, C.; et al. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
- ^ a b Molnar, Michael R. (July 1972). "The Helium-Weak Stars". Astrophysical Journal. 175: 453. Bibcode:1972ApJ...175..453M. doi:10.1086/151570.
- ^ a b c Garrison, R. F.; Gray, R. O. (April 1994). "The late B-type stars: refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astronomical Journal. 107: 1556. Bibcode:1994AJ....107.1556G. doi:10.1086/116967.
- ^ Hoffleit, D.; Warren, Jr., W. H. "HR 4552, database entry". The Bright Star Catalogue (5th Revised (Preliminary Version) ed.). Centre de Données astronomiques de Strasbourg. Retrieved 2020-12-31. ID V/50. Accessed on line September 23, 2008.
- ^ a b Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
- ^ a b North, P. (June 1998). "Do SI stars undergo any rotational braking?". Astronomy and Astrophysics. 334: 181–187. arXiv:astro-ph/9802286. Bibcode:1998A&A...334..181N.
- ^ a b c d e Arcos, C.; Kanaan, S.; Chávez, J.; Vanzi, L.; Araya, I.; Curé, M. (March 2018). "Stellar parameters and H
α line profile variability of Be stars in the BeSOS survey". Monthly Notices of the Royal Astronomical Society. 474 (4): 5287–5299. arXiv:1711.08675. Bibcode:2018MNRAS.474.5287A. doi:10.1093/mnras/stx3075. - ^ a b c d Sikora, J.; et al. (February 2019). "A volume-limited survey of mCP stars within 100 pc - I. Fundamental parameters and chemical abundances". Monthly Notices of the Royal Astronomical Society. 483 (2): 2300–2324. arXiv:1811.05633. Bibcode:2019MNRAS.483.2300S. doi:10.1093/mnras/sty3105.
- ^ a b Sikora, J.; et al. (March 2019). "A volume-limited survey of mCP stars within 100 pc II: rotational and magnetic properties". Monthly Notices of the Royal Astronomical Society. 483 (3): 3127–3145. arXiv:1811.05635. Bibcode:2019MNRAS.483.3127S. doi:10.1093/mnras/sty2895.
- ^ Kaler, James B. (July 4, 2015). "Beta Hydrae". Stars. Retrieved 2020-12-31.
- ^ a b "bet hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-31.
- ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 216. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
- ^ Bychkov, V. D.; et al. (August 2003). "Catalogue of averaged stellar effective magnetic fields. I. Chemically peculiar A and B type stars". Astronomy and Astrophysics. 407 (2): 631–642. arXiv:astro-ph/0307356. Bibcode:2003A&A...407..631B. doi:10.1051/0004-6361:20030741. S2CID 14184105.
- ^ Gray, Richard O.; Corbally, Christopher J. (2009). Stellar Spectral Classification. Princeton University Press. pp. 176–183. ISBN 978-0691125114.
- ^ Mikulášek, Z.; et al. (January 2007). "On-line database of photometric observations of magnetic chemically peculiar stars". Astronomische Nachrichten. 328 (1): 10–15. Bibcode:2007AN....328...10M. doi:10.1002/asna.200610705.
- ^ Basso, Ellen B. (1987). In Favor of Deceit: A Study of Tricksters in an Amazonian Society. Tucson, Arizona: University of Arizona Press. p. 360. ISBN 0-8165-1022-9.