| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 44m 20.2387s[1] |
| Declination | −08° 40′ 16.8486″[1] |
| Apparent magnitude (V) | 10.69[2] |
| Characteristics | |
| Spectral type | sdB / dM[3] |
| Variable type | eclipsing binary |
| Astrometry | |
| Proper motion (μ) | RA: 8.969±0.175[1] mas/yr Dec.: −15.677±0.107[1] mas/yr |
| Parallax (π) | 5.7972 ± 0.0849 mas[1] |
| Distance | 563 ± 8 ly (172 ± 3 pc) |
| Absolute magnitude (MV) | 4.22 (sdB) + 15.59 (dM)[4] |
| Absolute bolometric magnitude (Mbol) | 1.46 (sdB) + 11.20 (dM)[4] |
| Orbit[4] | |
| Period (P) | 0.11671967 d |
| Semi-major axis (a) | 0.860 ± 0.010 R☉ |
| Eccentricity (e) | <0.0003 |
| Inclination (i) | 80.98 ± 0.10° |
| Details[4] | |
| sdB | |
| Mass | 0.485 ± 0.013 M☉ |
| Radius | 0.183 ± 0.026 R☉ |
| Luminosity | 19.7 ± 5.6 L☉ |
| Temperature | 28488 ± 208 K |
| dM | |
| Mass | 0.142 ± 0.004 M☉ |
| Radius | 0.175 ± 0.026 R☉ |
| Luminosity | 0.003 ± 0.001 L☉ |
| Temperature | 3084 ± 889 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HW Virginis, abbreviated HW Vir, is an eclipsing binary system (of the Algol type), approximately 563 light-years away based on the parallax measured by the Gaia spacecraft,[1] in the constellation of Virgo. The system comprises an eclipsing B-type subdwarf star and red dwarf star. The two stars orbit each other every 0.116795 days.[6]
- ^ a b c d e f Cite error: The named reference
Gaia DR2was invoked but never defined (see the help page). - ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- ^ Almeida, L. A.; Jablonski, F.; Tello, J.; Rodrigues, C. V. (2012). "A photometric and spectroscopic study of NSVS 14256825: The second sdOB+dM eclipsing binary". Monthly Notices of the Royal Astronomical Society. 423 (1): 478. arXiv:1203.1266. Bibcode:2012MNRAS.423..478A. doi:10.1111/j.1365-2966.2012.20891.x. S2CID 119177743.
- ^ a b c d Cite error: The named reference
BrownSevillawas invoked but never defined (see the help page). - ^ Cite error: The named reference
Simbadwas invoked but never defined (see the help page). - ^ Kiss, L. L.; Csák, B.; Szatmáry, K.; Furész, G.; Sziládi, K. (2000). "Spectrophotometry and period analysis of the sdB eclipsing binary HW Virginis". Astronomy and Astrophysics. 364: 199–204. arXiv:astro-ph/0010446. Bibcode:2000A&A...364..199K.