Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..136s&link_type=abstract
Astronomy and Astrophysics, v.320, p.136-146
Astronomy and Astrophysics
Astrophysics
25
Novae, Cataclysmic Variables, Stars: Evolution, Stars: Population Ii, Binaries: Close
Scientific paper
We study the long-term evolution of cataclysmic variables (CVs) as a function of the companion star metallicity. It is shown that CVs with secondaries of low metallicity (Z=10^-4^) which belong to population II (PopII CVs) pass through a detached phase with a smaller period width, a shorter minimum period, and display a slightly higher mass transfer rate, resulting in shorter evolutionary timescales compared to CVs with a solar chemical composition of the secondary. A population synthesis model for PopII CVs with a star formation period lasting for 10^9^yr after the onset of Galaxy formation shows that most PopII CVs have already evolved beyond the minimum period. As these systems are faint, they are difficult to observe. Extracting a magnitude-limited sample from the computed intrinsic models and taking into account the sample's incompleteness towards fainter apparent magnitudes we derive a period distribution both for PopII CVs and the more common population I CVs. From a differential comparison of the models we calculate the probability that a CV at a given vector distance r from the Sun is member of the population II. Based on our results, we find that a reasonable observable sample of PopII CVs can only be found for z>2000pc.
Kolb Ulrich
Ritter Hans
Stehle Rudolf
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