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HD 221605


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UVBY photometry of the magnetic chemically peculiar stars HD 11187, HD 15144, 20 Eridani and HR 8933 and the early F star HD 14940.
Four College Automated Photoelectric Telescope differential Stroemgrenuvby photometric observations of four magnetic chemically peculiar starsare presented. One of our comparison stars was also found to bevariable. Observations of the sharp-lined Si star HD 11187 are bestdescribed as representing a constant star. HD 15144 was also constantphotometrically. However, its comparison star HD 14940 is definitelyvariable. But we were not able to find a period. It may be a δ Scustar. Our observations of 20 Eri and the uvby values of Renson &Manfroid show definite differences in the shapes of the light curvewhich suggest that this star may be undergoing a precession of itsrotational axis. When we refined the period by using the minima we finda value of 1.92893 days. We refined Winzer's period of the relativelylarge amplitude variable HR 8933 to 2.86031 days. In v and b there aredefinite indications of a weak sub-maximum within the broad minimum.

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Observation and Astrometry data

Constellation:ペガスス座
Right ascension:23h33m28.12s
Declination:+24°20'32.8"
Apparent magnitude:6.911
Distance:151.976 parsecs
Proper motion RA:63.1
Proper motion Dec:9.8
B-T magnitude:7.147
V-T magnitude:6.931

Catalogs and designations:
Proper Names
HD 1989HD 221605
TYCHO-2 2000TYC 2250-1368-1
USNO-A2.0USNO-A2 1125-19854470
HIPHIP 116265

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