Browsing by Subject "Stars: individual: HD 217522"
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Short time-scale frequency and amplitude variations in the pulsations of an roAp star: HD 217522
(Oxford Univ Press, 2015)Photometric observations of HD 217522 in 1981 revealed only one pulsation frequency ν1 = 1.215 29 mHz. Subsequent observations in 1989 showed the presence of an additional frequency ν2 = 2.0174 mHz. New observations in ...