منابع مشابه
Contact Binary Stars in Microlensing Surveys
A brief summary of properties of the contact binaries is presented, with the goal to stress the unsolved problems of their formation and evolution as well as their potential contribution to studies of Galactic stellar populations. The first results from the OGLE survey, where the contact binaries contribute a full two thirds among 933 eclipsing binary stars, are presented. 1 Properties of conta...
متن کاملFraction of Contact Binary Trojan Asteroids
We present the results of an optical lightcurve survey of 114 Jovian Trojan asteroids conducted to determine the fraction of contact binaries. Sparse-sampling was used to assess the photometric range of the asteroids and those showing the largest ranges were targeted for detailed follow-up observations. This survey led to the discovery of two Trojan asteroids, (17365) and (29314) displaying lar...
متن کاملA ROSAT Survey of Contact Binary Stars
Contact binary stars are common variable stars which are all believed to emit relatively large fluxes of x-rays. In this work we combine a large new sample of contact binary stars derived from the ROTSE-I telescope with x-ray data from the ROSAT All-Sky Survey (RASS) to estimate the x-ray volume emissivity of contact binary stars in the galaxy. We obtained x-ray fluxes for 140 contact binaries ...
متن کاملThe shortest period field contact binary ⋆
Photometric and spectroscopic results for the contact binary GSC 01387–00475 (ASAS 083128+1953.1) are presented. The existence of this binary with the orbital period of P = 0.2178 d strengthens the argument that the cut-off of the period distribution for contact binaries until now defined by CC Comae – is very sharp. The only case of a still shorter period is known in a globular cluster where m...
متن کاملAssessments of applicability of Q and RMi systems in binary tunnels of Bakhtiari dam_ Iran
The main rock mass classification systems make use of similar rock mass parameters. Due to lack of comprehensive estimation systems, determining the real specifications of jointed rocks faces some difficulties. A vast number of parameters with various degrees of impact are involved in such definitions. Combination impact of all the effective parameters is to be figured out in order to come up w...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1992
ISSN: 0074-1809
DOI: 10.1017/s0074180900122557