Astronomy:VW Hydri
| Observation data Equinox J2000.0]] (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[1] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 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. doi:10.1051/0004-6361/202347694. Bibcode: 2024A&A...682A...5V.
- ↑ 5.0 5.1 5.2 Smith, Amanda J.; Haswell, Carole A.; Hynes, Robert I. (2006-06-07). "VW Hyi: optical spectroscopy and Doppler tomography" (in en). Monthly Notices of the Royal Astronomical Society 369 (4): 1537–1546. doi:10.1111/j.1365-2966.2006.10409.x.
- ↑ "V* VW Hyi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+VW+Hyi.
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
- ↑ Vogt, N. (1974). "Photometric study of the dwarf nova VW Hydri". Astronomy and Astrophysics 36: 369–78. Bibcode: 1974A&A....36..369V.
- ↑ 9.0 9.1 BSJ (19 July 2010). "VW Hydri". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsots_vwhyi.
- ↑ 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. doi:10.1093/mnras/289.2.388. Bibcode: 1997MNRAS.289..388G.
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