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A Photometric Monitoring of Barium Stars*

Published online by Cambridge University Press:  12 April 2016

A. Jorissen
Affiliation:
Institut d'Astronomie, d'Astrophysique et de Geophysique, Universite Libre de Bruxelles
J. Manrfroid
Affiliation:
Institut d'Astrophysique Universite de Liege
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Extract

An uvby photometric monitoring of a sample of 19 Ba II stars has been performed since July 1984 at ESO on the Danish and ESO 50 cm telescopes, as part of the “Long Term Program for Variable Stars” (Sterken, 1983). The sample contains southern Ba II stars with variable radial velocities (from McClure, 1983 and Jorissen and Mayor, 1988) as well as Ba II stars already monitored by Landolt (1983). The observations are done differentially, using two comparison giants of the same spectral type located within a few degrees of the Ba II star. The reduction to the standard uvby system is performed using the algorithm described in Manfroid and Heck (1983), taking into account all the measurements performed on the considered telescope since the beginning of the monitoring. With such a reduction procedure, the scatter in the magnitude difference between two comparison stars (of magnitude 5 to 7) can be as low as 0.003-0.004 mag rms.

Type
1. Properties and Kinematics of the Peculiar Red Giant Stars
Copyright
Copyright © Cambridge University Press 1989

Footnotes

+

Senior Research Associate, Belgian National Fund for Scientific Research.

*

Based on observations carried on at the European Southern Observatory (ESO, La Silla, Chile).

References

Jorissen, A., Mayor, M. 1988, Astron. Astrophvs. 198, 187.Google Scholar
Landolt, A.U. 1983, Pubi. Astron. Soc. Pacific 95, 644.Google Scholar
Manfroid, J., Heck, A. 1983, Astron. Astrophvs. 120, 302.Google Scholar
McClure, R.D. 1983, Astrophvs. J. 268, 264.Google Scholar
Sterken, C. 1983, Messenger 33, 10.Google Scholar
Warner, B. 1972, Monthly Notices Roy. Astron. Soc. 159, 95.Google Scholar
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