HD 224638 and HD 224945: two new unusual variables among early F-type stars

Details HD 224638 and HD 224945: two new unusual variables among early F-type stars HD 224638 and HD 224945: two new unusual variables among early F-type stars

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994dssn....7r...4m&link_type=abstract

Delta Scuti Star Newsletter, Issue 7, p. 4-4.

Physics

Scientific paper

The two main sequence early F-type stars HD 224638 and HD 224945 show unusual types of light variations. We obtained about 1000 data points for each star on 20 nighLs over a period of 35 d (corresponding to 118 hours of monitoring). The frequency analysis by several different techniques shows that both light curves contain two close periodic terms of about 0.8 c/d. The two terms of HD 224638 have a double wave shape, while those of HD 224945 have a triple wave shape. However, these terms are unable to fully account for the light variations. A similar behaviour could also be explained by single pseudoperiodic variations with a time scale of about 0.8 c/d. High resolution spectrograms give evidence of line profilc variations in HD 224638.

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