Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999obs...119..344y&link_type=abstract
The Observatory, Vol. 119, p. 344-344 (1999)
Other
Scientific paper
The primary purpose of this thesis is to obtain more accurate orbital parameters for a number of Algol-type binaries. In this study, five systems were observed in two observing runs in 1994 (La Palma, 7 nights) and 1997 (Mexico, 4 nights). The 1994 run consisted of single slit observations of U CrB, TU Mon and TX UMa. In 1997, U CrB was repeated and RS Vul and GU Her were added to the target list; in this case, the observing was carried out with an Echelle spectrograph. Data reduction was done using FIGARO and IRAF for the 1994 and 1997 data sets, respectively. The radial velocity curves of these five systems were analysed to obtain accurate orbital parameters, in particular to try to obtain radial velocity semi-amplitudes, K1 and K2, for both components. For U CrB, a new pair of K1 and K2 was found which leads us to a much more sensible point in the evolutionary sequence of this system. For TX UMa and TU Mon only confirmation of their published K1 values could be achieved because of their low resolution spectra which did not enable the other component to be resolved. For RS Vul, K1 was confirmed. Because of the inadequate phase coverage at one quadrature, the K2 value could not be improved, but a comparison was made with the latest published value. GU Her was defined to be a `cool algol' (i.e. both components are late type sub giants), and the K1 and K2 value of the system was found for the first time. Besides radial velocity studies, magnetic activity in Algol-type binaries and its relation to their evolutionary sequences is also discussed. In this part of study some Algol--type binaries are categorised into four Groups depending on the evolutionary stage of the system. We claim to find that there is a remarkable correlation between evolutionary status and X--ray activity in the mass losing star of the system. In addition to already observed and categorised systems a list of systems is presented as candidates for this categorisation.
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