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| Paper: |
Period Variations in Three Eclipsing Binaries in Vulpecula |
| Volume: |
496, Living Together: Planets, Host Stars and Binaries |
| Page: |
284 |
| Authors: |
Hanna, M. A. |
| Abstract: |
We investigate the period variations for three eclipsing binaries
showing strong evidence of period changes, by means of the O–C
residual diagram. Two of them, BK Vul and KN Vul, are W UMa-type
contact binaries, while the third, V467 Vul, is a β Lyr
semi-detached system. All three exhibit period
changes dP/dt (decreases) over the long term, which are usually
interpreted
as being due to mass transfer from the primary to the secondary
component, or mass loss from L2. The period variability of KN Vul
also shows a sine-like variation superimposed on the parabolic
behavior, which may be interpreted in terms of either magnetic activity or the
light time effect. |
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