Photometric variability on the lower part of the Cepheid instability strip. I - Evolved AM stars

Details Photometric variability on the lower part of the Cepheid instability strip. I - Evolved AM stars Photometric variability on the lower part of the Cepheid instability strip. I - Evolved AM stars

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83..114g&link_type=abstract

Astronomy and Astrophysics, vol. 83, no. 1-2, Mar. 1980, p. 114-117.

Astronomy and Astrophysics

Astrophysics

7

A Stars, Astronomical Photometry, Cepheid Variables, Metallic Stars, Stellar Atmospheres, Abundance, Electrophotometry, Periodic Variations, Stellar Evolution

Scientific paper

Some evolved metallic A type stars have been observed photometrically to check them for pulsational stability. No short period variations have been found within σ = 0.003 to σ = 0.006 mag. Further observations were performed in order to confirm long term variability in some of these stars. However, they also appeared to be constant within about σ = 0.002 to σ = 0.004 mag. along several days. These results allow a comparison between the constant evolved Am stars and the δ Del stars which show both abundance anomalies and pulsational instability. Two new pulsating stars have been discovered as a result of this observational program.

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