Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..135..547b&link_type=abstract
Astronomy and Astrophysics Supplement, v.135, p.547-553
Astronomy and Astrophysics
Astrophysics
20
Scientific paper
204 hours of high-quality measurements of 4 CVn during 32 nights were obtained with the 0.75 m Automatic Photolectric Telescope (APT). The two comparison stars measured agreed to +/-2.7 mmag per single measurement in Stromgren y and +/-3.0 mmag in v. It is shown that APT's can be used successfully for the study of stellar nonradial pulsation at the millimag level. An analysis of the multiperiodicity of 4 CVn revealed the presence of 19 simultaneously excited pulsation frequencies. This presents a considerable increase from the 7 frequencies found during a previous campaign of the Delta Scuti Network. The previously known frequencies were confirmed with amplitude variability on a time scale of years.
Breger Michel
Hiesberger F.
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