U Leporis
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Star U Leporis |
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| AladinLite | |||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Hare | ||||||||||
| Right ascension | 04 h 56 m 17.99 s | ||||||||||
| declination | −21 ° 13 ′ 2 ″ | ||||||||||
| Apparent brightness | 10.64 (9.89 to 11.09) mag | ||||||||||
| Typing | |||||||||||
| B − V color index | (0.12) | ||||||||||
| Spectral class | A7 to F7 | ||||||||||
| Variable star type | RRAB | ||||||||||
| Astrometry | |||||||||||
| Radial velocity | (−120) km / s | ||||||||||
| parallax | 0.93 ± 0.03 mas | ||||||||||
| distance | (3,500) ly (1,100) pc |
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| Proper movement | |||||||||||
| Rec. Share: | (40.79) mas / a | ||||||||||
| Dec. portion: | (−59.77) mas / a | ||||||||||
| Physical Properties | |||||||||||
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Other names and catalog entries |
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U Leporis is a giant star about 3500 light years away in the constellation Rabbit . It is an RR Lyrae star and thus belongs to the pulsation variable stars .
As early as 1923, Ejnar Hertzsprung mentioned the variability of U Lep in a contribution .
properties
The star has already passed the red giant phase and is in the helium-burning stage in the core. After the star moved along the horizontal branch in the HR diagram , it landed in the instability strip . Therefore the star pulsates with a period of about 0.58 days (14 hours) between a magnitude of 9.89 to 11.09. The star is a very old star with low metallicity and belongs to the Population II stars
Web links
Individual evidence
- ↑ a b c d e U Lep. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 9, 2018 .
- ↑ a b c d U Lep. In: VSX. AAVSO, accessed September 9, 2018 .
- ^ Ejnar Hertzsprung : Remarks on the period of U Leporis . In: Bulletin of the Astronomical Institutes of the Netherlands . 2, July 1923, p. 18. bibcode : 1923BAN ..... 2 ... 18H .