W serpentis
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Double star W Serpentis |
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| AladinLite | |||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Snake | ||||||||||||||
| Right ascension | 18 h 09 m 50.65 s | ||||||||||||||
| declination | −15 ° 33 ′ 0.3 ″ | ||||||||||||||
| Apparent brightness | 8.42 (8.42-10.2) mag | ||||||||||||||
| Typing | |||||||||||||||
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rel. Brightness (G-band) |
8.78 ± 0.01 mag | ||||||||||||||
| B − V color index | +1.22 | ||||||||||||||
| Spectral class | F8 / G2 Iaep | ||||||||||||||
| Variable star type | EA / GS | ||||||||||||||
| Astrometry | |||||||||||||||
| Radial velocity | −13.4 km / s | ||||||||||||||
| parallax | (1.22 ± 0.05) mas | ||||||||||||||
| distance | 2,700 ly 820 pc |
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| Proper movement | |||||||||||||||
| Rec. Share: | +0.38 ± 0.09 mas / a | ||||||||||||||
| Dec. portion: | +3.43 ± 0.08 mas / a | ||||||||||||||
| Physical Properties | |||||||||||||||
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Other names and catalog entries |
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W Serpentis is a binary star about 3000 light years away . It belongs to the eclipsed stars . Sometimes it is also treated as a prototype of the W Serpentis stars . At least one of the stars is a giant star .
W-Serpentis stars possibly go through several phases by mass transfer in which the spectra change and accordingly also the classification, whereby several classes of variable stars would simply represent different stages of stellar evolution in these close binary star systems.
See also
Web links
Individual evidence
- ↑ a b c d e f g h W Ser. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 11, 2018 .
- ↑ a b W Ser. In: VSX. AAVSO , accessed September 11, 2018 .
- ^ RE Wilson: The Relation of Algols and W Serpentis Stars . In: Algols 1989, ISBN 978-94-010-7587-9 , p. 191, doi : 10.1007 / 978-94-009-2413-0_17 .
- ^ RE Mennickent, Z. Kołaczkowski: Interacting Binary Stars Environments and the W Ser-DPV-Algol Connection . In: The Interferometric View on Hot Stars (Eds. Th. Rivinius & M. Curé) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 38 . 38, 2010, p. 23. arxiv : 0904.1539 . bibcode : 2010RMxAC..38 ... 23M .