Observational evidence for the pulsational stability of some AP stars

Details Observational evidence for the pulsational stability of some AP stars Observational evidence for the pulsational stability of some AP stars

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...35...83w&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 35, Jan. 1979, p. 83-106. Research supported by the Oesterreichischer Fonds

Astronomy and Astrophysics

Astrophysics

15

A Stars, Magnetic Stars, Stellar Spectrophotometry, Variable Stars, Diffusion, Stellar Atmospheres, Stellar Magnitude, Stellar Rotation, Tables (Data), Telephotometry, Ubv Spectra

Scientific paper

Sixteen peculiar A type stars (one of them questionable) and two Am stars have been observed photometrically during a continuous observing run of 2 to 4 hours each, to check them for pulsational stability. All Ap stars proved to be of constant brightness to within about the standard duration of 0.002 to 0.003 mag, except for an eventual long-term variability due to rotation. Therefore, no observational evidence from this side can be brought up against diffusion as a possible mechanism responsible for peculiar atmospheres. Both Am stars also proved to be of constant brightness. Four new pulsating variable stars have been discovered from observations in the program.

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