HR 465

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HR 465

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GY Andromedae
Observation data
Epoch J2000
Constellation
(pronunciation)		 Andromeda
Right ascension 01h 38m 31.8s
Declination +45° 23′ 59″
Apparent magnitude (V) 6.36
Characteristics
Spectral type B9 pCrEu
Variable type α2 Canum Venaticorum
Astrometry
Radial velocity (Rv) +3 km/s
Proper motion (μ) RA: -16.21 mas/yr
Dec.: 0.59 mas/yr
Parallax (π) 7.17 ± 0.85 mas
Distance 455 ly (140 pc)
Absolute magnitude (MV) 0.64
Other designations
GY Andromedae, HR 465, BD +44°341, HD 9996, SAO 37393, HIP 7651.
Database references
SIMBAD data

HR 465 (GY Andromedae or GY And) is an Alpha2 Canum Venaticorum type variable star in the constellation Andromeda. Its brightness fluctuates between 6.27 mag and 6.41 mag. It belongs to the group of CP stars (chemically peculiar stars). Its most striking characteristic is the occurrence of the element promethium in its emission spectrum. It is also a spectroscopic binary star with a period of almost 273 days and an eccentricity of 0.47.

[edit] References

  • Aller, M. F. 1971. "Promethium in the star HR465", Sky & Telescope, vol.41, pp.220-222
  • Scholz, G., 1978, "Spectroscopic investigations of the magnetic AP star HD 9996", Astronomische Nachrichten, vol. 299, no. 2. pp. 81-85.

[edit] External links

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