Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152...15w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 1, Nov. 1985, p. 15-24. Research supported by the Ministerie van Onde
Astronomy and Astrophysics
Astrophysics
9
Cepheid Variables, Early Stars, Stellar Oscillations, Brightness, Light Curve, Star Distribution, Stellar Color
Scientific paper
The discovery of two hitherto unknown Beta Cephei candidates is reported. The photometric variations of both stars indicate the presence of at least three frequencies. The periods of HD 147985 are 0.13231 d, 0.14493 d, and 0.15666 d; the periods of HD 15662 are 0.16890 d, 0.18861 d, and 0.16978 d. Both variables belong to the Scorpius complex. Unlike the Beta Cephei candidates discovered in NGC 6231 (Balona and Shobbrook, 1983), they fit into the classical instability strip. It thus seems unlikely that the peculiar position in the HR diagram of the variables in NGC 6231 is related to the galactic location of the cluster. The possibility of a more extended instability strip is discussed in view of the results of recent surveys in the solar neighborhood. It is found that the actual instability strip closely parallels the main sequence.
Cuypers Jan
Waelkens Christoffel
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