[en] A study of the light variability of a number of peculiar A stars, mainly in Stromgren colors u and v and in peculiarity index Delta-a, leads to the proposal of the following light variability periods: (1) HD 5601, 1.11 days; (2) HD 19712, 2.19 days; (3) HD 30849, 15.86 days; (4) HD 38823, 8.64 days; (5) HD 53116, 11.98 or 18.10 days; (6) HD 56022, 0.92 days; and (7) HD 81009, 33.97 days. In addition, evidence is given for variability of HD 94660 on a time scale on the order of months or years, and it is shown that the rotation period proposed by Borra and Landstreet (1980) for HD 25267 is not supported by the light variations observed. The character of Delta-a variability is discussed.
Maitzen, H. M.; CNRS, Institut d'Astrophysique, Paris ; Paris XI, Universite, Orsay, Essonne, France
Weiss, W. W.; CNRS, Institut d'Astrophysique, Paris ; Paris XI, Universite, Orsay, Essonne, France
Gerbaldi, M.; CNRS, Institut d'Astrophysique, Paris ; Paris XI, Universite, Orsay, Essonne, France
Delmas, F.; CNRS, Institut d'Astrophysique, Paris, France
Morguleff, N.; CNRS, Institut d'Astrophysique, Paris, France
Renson, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA)
Language :
English
Title :
A photoelectric investigation of light variability in Ap stars
