| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 29m 28.66s |
| Declination | −58° 54′ 46.7″ |
| Apparent magnitude (V) | 14.3-19.3 |
| Characteristics | |
| Spectral type | WD + M3-4V |
| Variable type | SW Sex[2] |
| Astrometry | |
| Parallax (π) | 1.0871 ± 0.0263 mas |
| Distance | 3,000 ± 70 ly (920 ± 20 pc) |
| Absolute magnitude (MV) | 15.52[3] |
| Details | |
| Temperature | 9365 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
BB Doradus or BB Dor is a cataclysmic variable, a pre-nova star, thus a close pair binary star system. It is composed of a red dwarf and a white dwarf.[4] Observations of the white dwarf's faint but certain accretion disk are consistent with it being at ~10° inclination (to the line of sight from the Earth).[5]
Its parallax (movement against background stars due to the Earth's orbit around the Sun) given by the Gaia space observatory's second data release puts the pair at about 3,000 light years away.[6]
References
[edit]- ^ Rodríguez-Gil, P.; Schmidtobreick, L.; Long, K. S.; Gänsicke, B. T.; Torres, M. A. P.; Rubio-Díez, M. M.; Santander-García, M. (May 2012). "The fight for accretion: discovery of intermittent mass transfer in BB Doradus in the low state". Monthly Notices of the Royal Astronomical Society. 422 (3): 2332–2340. arXiv:1202.4921. Bibcode:2012MNRAS.422.2332R. doi:10.1111/j.1365-2966.2012.20783.x. S2CID 119211508. Retrieved 1 January 2022.
- ^ Schmidtobreick, L.; et al. (October 2011). Henney, W. J.; Torres-Peimbert, S. (eds.). The structure of BB Doradus in quiescence. XIII Latin American Regional IAU Meeting. Revista Mexicana de Astronomía y Astrofísica. Vol. 40. p. 288-288. Bibcode:2011RMxAC..40..288S.
- ^ "V* BB Dor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-22.
- ^ Watson, Christopher (24 February 2012). "BB Doradus". AAVSO Website. American Association of Variable Star Observers. Retrieved 5 November 2014.
- ^ Godon, Patrick; et al. (November 2008). "Far Ultraviolet Spectroscopic Explorer Spectroscopy of the Nova-like Cataclysmic Variable BB Doradus". The Astrophysical Journal. 687 (1): 532–541. arXiv:0805.4209. Bibcode:2008ApJ...687..532G. doi:10.1086/591494. S2CID 17100291.
- ^ 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.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction