U Leporis
Star U Leporis |
|||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
AladinLite | |||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
|||||||||||
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 |
||||||||||
Proper movement | |||||||||||
Rec. Share: | (40.79) mas / a | ||||||||||
Dec. portion: | (−59.77) mas / a | ||||||||||
Physical Properties | |||||||||||
Other names and catalog entries |
|||||||||||
|
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 .