U Vulpeculae

U Vulpeculae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Vulpecula
Right ascension 19h 36m 37.72789s[1]
Declination 20° 19′ 58.5946″[1]
Spectral typeF6Iab-G2[2]
Other designations
BD+20° 4200, HD 185059, HIP 96458, HR 7458, SAO 87447[1]

U Vulpeculae is a star in the constellation Vulpecula. A Cepheid variable, its apparent magnitude ranges from 6.73 to 7.54 over 7.99 days.[2] Its variable nature was discovered in 1898 at Potsdam Observatory by Gustav Müller and Paul Kempf.[3] In 1991 a study of radial velocities showed that it is a spectroscopic binary while a full orbit with a period of 2510 days (6.9 years) was calculated in 1996.[4][5]

References

  1. 1 2 3 "U Vulpeculae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 August 2015.
  2. 1 2 Watson, Christopher (4 January 2010). "U Vulpeculae". AAVSO Website. American Association of Variable Star Observers. Retrieved 2 August 2015.
  3. ↑ Müller, G.; Kempf, P. (1898). "Zwei neue Veränderliche von kurzer Periode". Astronomische Nachrichten (in German). 146 (3): 37–42. Bibcode:1898AN....146...37M. doi:10.1002/asna.18981460303.
  4. ↑ Szabados, L. (1991). "Northern Cepheids: Period Update and Duplicity Effects". Communications of the Konkoly Observatory. 11 part 3 (96): 123–244. Bibcode:1991CoKon..96..123S.
  5. ↑ Imbert, M. (1996). "Cepheids and binarity. II. Radial velocities and spectroscopic orbits of four galactic Cepheids: RX Camelopardalis, MW Cygni, Z Lacertae and U Vulpeculae". Astronomy and Astrophysics Supplement (in French). 116: 497–514. Bibcode:1996A&AS..116..497I.


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