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Simultaneous Photometric and Spectroscopic Observations of the unusual Variable F-type stars HD 224638 and HD 224945.

Published online by Cambridge University Press:  12 April 2016

L. Mantegazza ,
E. Poretti ,
M. Bossi  and
F.M. Zerbi
L. Mantegazza
Affiliation:
Dipartimento di Fisica Nucleare e Teorica, Universitá di Pavia, Italy
E. Poretti
Affiliation:
Osservatorio Astronomico di Brera, Italy
M. Bossi
Affiliation:
Osservatorio Astronomico di Brera, Italy
F.M. Zerbi
Affiliation:
Dipartimento di Fisica Nucleare e Teorica, Universitá di Pavia, Italy

Extract

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The stars HD 224638 and HD 224945 belong to the new class of F0 V spectral type stars which show an unusual kind of variability for that region of the HR diagram (Mantegazza et al. 1993).

The variability of these two stars has been discovered and studied by Mantegazza, Poretti & Zerbi (1994). They show small amplitude light variations with characteristic time scales of the order of one day. The light curves are not periodic and it is difficult to satisfactorily fit them even with several periodic terms.

In order to explain our 1991 B colour observations we tentatively suggested that in both stars two close periodic terms were present with a characteristic frequency of about 0.8 c/d, and that these terms had a double wave shape for HD 224638 and a triple wave one for HD 224945.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 339 - 340
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Mantegazza, L., Poretti, E., Antonello, E., & Zerbi, F.M. 1993, in: Inside the Stars, Weiss, W.W. & Baglin, A., ASP Conf. Ser. 40, 733 Google Scholar
Mantegazza, L., Poretti, E., & Zerbi, F.M. 1994, MNRAS, 270, 439 Google Scholar
Balona, L. 1986, MNRAS, 219, 111 Google Scholar