VW Hydri
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Hydrus |
| Right ascension | 04h 09m 11.3967s[1] |
| Declination | −71° 17′ 41.555″[1] |
| Apparent magnitude (V) | 8.4 to 14.4[2] |
| Characteristics | |
| Evolutionary stage | white dwarf + main sequence[3] |
| Spectral type | DQ[4] |
| Variable type | SU UMa[2] |
| Astrometry | |
| Proper motion (μ) | RA: +51.340[1] mas/yr Dec.: +12.250[1] mas/yr |
| Parallax (π) | 18.5743±0.0167 mas[1] |
| Distance | 175.6 ± 0.2 ly (53.84 ± 0.05 pc) |
| Orbit | |
| Period (P) | 0.07427130(14)[3] days |
| Details | |
| white dwarf | |
| Mass | 0.71+0.18 −0.26[5] or 0.95±0.12[3] M☉ |
| Radius | 0.0134+0.0036 −0.0037[5] R☉ |
| Surface gravity (log g) | 8.04+0.38 −0.41[5] cgs |
| Temperature | 20,000–50,000[3] K |
| companion | |
| Mass | 0.106±0.026 or 0.125±0.015[3] M☉ |
| Radius | 0.16–0.18[3] R☉ |
| Other designations | |
| TYC 9156-1776-1, 2MASS J04091138-7117413[6] | |
| Database references | |
| SIMBAD | data |
VW Hydri is a dwarf nova of the SU Ursae Majoris type in the deep southern constellation Hydrus; a star system that consists of a white dwarf and another generally cool star.
VW Hydri is one of the brightest dwarf novae systems in the sky.[8] These systems are characterised by frequent eruptions and less frequent supereruptions. The former are smooth, while the latter exhibit short "superhumps" of heightened activity.[9] The white dwarf sucks matter from the other star onto an accretion disc and periodically erupts, reaching apparent magnitude 8.4 in superoutbursts, 9.0 in normal outbursts and remaining at magnitude 14.4 when quiet. Normal outbursts occur every 27.3 days and last for 1.4 days, while superoutbursts happen 179 days and last for 12.6 days.[9][10]
References
[edit]- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 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.
- 1 2 3 4 5 6 Ogunwale, Bisi Bernard; Shara, Michael; Shporer, Avi; Guetta, Dafne; Tal-Or, Lev (2026-03-24). "A Deep Precursor Dip–Main Superoutburst Sequence in VW Hydri Observed with TESS: High-cadence Constraints on the Thermal–Tidal Instability Model". The Astrophysical Journal. 1000 (2): 209. doi:10.3847/1538-4357/ae4a18. ISSN 0004-637X.
- ↑ Vincent, O.; Barstow, M. A.; Jordan, S.; Mander, C.; Bergeron, P.; Dufour, P. (2024). "Classification and parameterization of a large Gaia sample of white dwarfs using XP spectra". Astronomy and Astrophysics. 682: A5. arXiv:2308.05572. Bibcode:2024A&A...682A...5V. doi:10.1051/0004-6361/202347694.
- 1 2 3 Smith, Amanda J.; Haswell, Carole A.; Hynes, Robert I. (2006-06-07). "VW Hyi: optical spectroscopy and Doppler tomography". Monthly Notices of the Royal Astronomical Society. 369 (4): 1537–1546. arXiv:astro-ph/0603798. doi:10.1111/j.1365-2966.2006.10409.x.
- ↑ "V* VW Hyi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 September 2013.
- ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ↑ Vogt, N. (1974). "Photometric study of the dwarf nova VW Hydri". Astronomy and Astrophysics. 36: 369–78. Bibcode:1974A&A....36..369V.
- 1 2 BSJ (19 July 2010). "VW Hydri". AAVSO Website. American Association of Variable Star Observers. Retrieved 12 September 2013.
- ↑ Gänsicke, B. T.; Beuermann, K.; Thomas, H.-C. (1997). "EK TrA, a close relative of VW Hyi". Monthly Notices of the Royal Astronomical Society. 289 (2): 388–92. Bibcode:1997MNRAS.289..388G. doi:10.1093/mnras/289.2.388.
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