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HD 49344


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The frequency of Ap-stars with long rotation periods
Light variability was observed over time intervals of months to years inthe stars HD 55540, HD 71066, HD 94660, and HD 187474. The significanceof these results is discussed in terms of the frequency of chemicallypeculiar CP2 stars showing (light) variability with periods longer thanone month. This frequency, relative to the whole CP2 population, mustlie somewhere between 4 and 16 percent. Observations, properlydistributed in time, of a small subgroup of CP2 stars will be sufficientto obtain an accurate ratio of the number of LP-CP2 stars to the totalnumber of CP2 stars. These observations, when continued until theperiodicity is detected, could contribute also to the discussion whetherthese long periods should be identified with the rotation period.

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Observation and Astrometry data

Constellation:Auriga
Right ascension:06h49m49.99s
Declination:+39°28'44.8"
Apparent magnitude:7.746
Distance:636.943 parsecs
Proper motion RA:-3.7
Proper motion Dec:-2.3
B-T magnitude:7.669
V-T magnitude:7.74

Catalogs and designations:
Proper Names
HD 1989HD 49344
TYCHO-2 2000TYC 2945-460-1
USNO-A2.0USNO-A2 1275-06589494
HIPHIP 32757

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