The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)

Details The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS) The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)

2007-08-22

arxiv.org/abs/0708.3020v1

Astronomy and Astrophysics

Astrophysics

accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12377.x

The search-volume corrected period distribution of contact binaries of the W UMa type appears to reflect primarily the constant number ratio of ~1/500 to the number of stars along the Main Sequence; there exist no evidence for angular momentum evolution. The maximum in contact binary numbers is located at shorter periods than estimated before, P ~ 0.27 d. The drop in numbers towards the cut-off at P ~ 0.215 - 0.22 d still suffers from the small number statistics while the cut-off itself remains unexplained. Only one out of seven short-period ASAS variables with P<0.22 d have been retained in the sample considered here within 8 < V < 13; this short-period field-sky record holder at P=0.2178 d should be studied.

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