Absolute dimensions of the close binary systems V453 Monocerotis and V523 Cassiopeiae |
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| Authors: | O Köse V Keskin K Yakut |
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| Institution: | (1) Faculty of Science, Department of Astronomy & Space Sciences, University of Ege, 35100 İzmir, Turkey;(2) Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK |
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| Abstract: | We present multi-colour CCD observations of the low-temperature contact binaries, V453 Mon and V523 Cas. Their light curves
are modelled to determine a new set of stellar and orbital parameters. Analysis of mid-eclipse times yields a new linear ephemeris
for both systems. A period decrease (dP/dt=2.3×10−7 days/yr) in V453 Mon is discovered. V523 Cas, however, is detected to show a period increase (dP/dt=9.8×10−8 days/yr) because of the mass transfer of a rate of 1.1×10−7 M⊙ yr−1, from a less massive donor. Using these findings we can determine the physical parameters of the components of V523 Cas to
be M
1=0.76 (3)M
⊙, M
2=0.39 (2)M
⊙, R
1=0.74 (2)R
⊙, R
2=0.55 (2)R
⊙, L
1=0.19 (3)L
⊙, L
2=0.14 (3)L
⊙, and the distance of system as 46(9) pc. |
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| Keywords: | Stars: binaries: eclipsing Stars: individual: V453 Mon Stars: individual: V523 Cas Stars: fundamental parameters |
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