WX Piscium
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Star WX Piscium |
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| AladinLite | |||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | fishes | ||||
| Right ascension | 01 h 06 m 25.98 s | ||||
| declination | + 12 ° 35 ′ 53.1 ″ | ||||
| Apparent brightness | (+20.7 B-band) mag | ||||
| Typing | |||||
| R − I index | (4.25) | ||||
| Spectral class | M9 | ||||
| Variable star type | Yes | ||||
| Astrometry | |||||
| Radial velocity | (11) km / s | ||||
| distance | (2,400) ly (740) pc |
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| Physical Properties | |||||
| radius | (520) R ☉ | ||||
| Luminosity |
(13900) L ☉ |
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| Effective temperature | (2750) K. | ||||
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Other names and catalog entries |
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WX Piscium (also IRC +10011 ) is a red giant of the class of OH / IR stars . The spectrum of these stars is extremely shifted into the infrared and it is believed that they are about to transition to the white dwarf . As a result, these stars are much less visible or even invisible in visible light , whereby this effect can be intensified by a disk of dust surrounding the star .
The star appears to have had a very high rate of mass loss from stellar winds in the past , the rate not being constant at all, but fluctuating widely. Over a period of about 600 years, the annual mass loss seems to have been about 10 −5 M ☉ . This phase ended 800 years ago and the loss of mass was greatly reduced to about 5 × 10 −8 M ☉ . Recently, however, the rate has increased again to around 6 × 10 −6 M ☉ .
See also
Individual evidence
- ↑ a b c d Simbad
- ↑ EA Lipman et. al: Interferometric Observations of IRC +10011 and IRC +10420 in the Mid-Infrared . In: The Astrophysical Journal . 532, 2000, pp. 467-473. bibcode : 2000ApJ ... 532..467L . doi : 10.1086 / 308569 .
- ^ A b c d E. De Beck, L. Decin, A. De Koter, K. Justtanont, T. Verhoelst, F. Kemper, KM Menten: Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: Derivation of mass-loss rate formulas . In: Astronomy and Astrophysics . 523, 2010, p. A18. arxiv : 1008.1083 . bibcode : 2010A & A ... 523A..18D . doi : 10.1051 / 0004-6361 / 200913771 .
- ↑ L. Decin et. al: The variable mass loss of the AGB star WX Piscium as traced by the CO J = 1-0 through 7-6 lines and the dust emission . In: Astronomy & Astrophysics . 532, 2007, pp. 467-473. doi : 10.1051 / 0004-6361: 20077737 .