UY Scuti
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Star UY Scuti |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | sign | ||||||||
| Right ascension | 18 h 27 m 36.53 s | ||||||||
| declination | -12 ° 27 ′ 58.9 ″ | ||||||||
| Apparent brightness | 11.2 mag | ||||||||
| Typing | |||||||||
| B − V color index | +3.00 | ||||||||
| R − I index | +2.58 | ||||||||
| Spectral class | M2-M4Ia-Iab | ||||||||
| Variable star type | SRC | ||||||||
| Astrometry | |||||||||
| Radial velocity | (18.33 ± 0.82) km / s | ||||||||
| parallax | (0.64 ± 0.11) mas | ||||||||
| distance | (5000 ± 1200) ly 1,500 pc |
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| Physical Properties | |||||||||
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Other names and catalog entries |
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UY Scuti is a red supergiant in the constellation Schild ( Latin Scutum) . He is one of the greatest known stars .
The distance from UY Scuti is assumed to be approximately 1500 parsecs (this corresponds to 5000 light years ); but this is not certain. It is a variable star with a period of 740 days. In view of its position within the Hertzsprung-Russell diagram and its severe mass loss, it appears to be a star that is in its stellar evolution in the late stages of its focal phases. It left the main sequence several million years ago.
radius
The radius of this star is not conclusively determined. In a study published in 2013, the angular diameter of the object was determined interferometrically using the mean gray Rosseland opacity to be 5.48 ± 0.10 mas . Assuming a distance of 2900 pc, estimated by modeling the spectrum, this would result in a radius of around 1700 solar radii , which would exceed the major semi-axis of Jupiter's orbit .
designation
The first part of the UY name, according to the rules for naming variable stars , states that UY Scuti is the 38th variable star discovered in the constellation of Shield. The second part of the name Scuti corresponds to the genitive of the Latin name of the constellation Schild: Scutum.
Web links
Individual evidence
- ↑ a b c d e f g UY Sct. SIMBAD , accessed on September 9, 2018 .
- ↑ a b UY Sct. In: VSX. AAVSO, accessed September 9, 2018 .
- ↑ M. Jura, SG Kleinmann: Mass-losing M Supergiants in the Solar Neighborhood . Ed .: American Astronomical Society . August 1990, bibcode : 1990ApJS ... 73..769J (English): “classified as supergiant”
- ↑ M. Jura, SG Kleinmann: Mass-losing M Supergiants in the Solar Neighborhood . Ed .: American Astronomical Society . August 1990, bibcode : 1990ApJS ... 73..769J (English).
- ↑ B. Arroyo-Torres, M. Wittkowski, JM Marcaide, PH Hauschildt: The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii. Astronomy and Astrophysics , June 2013, accessed February 24, 2015 .