P. Zasche, P. Svoboda, R. Uhlar
A study of late-type low-mass eclipsing binaries provides us with important
information about the most common stars in the Universe. We obtain the first
light curves and perform period analyses of two neglected eclipsing binaries GK
Boo and AE For to reveal their basic physical properties. We performed both a
period analysis of the times of the minima and a BVR light curve analysis. Many
new times of minima for both the systems were derived and collected from the
data obtained by automatic and robotic telescopes. This allowed us to study the
long-term period changes in these systems for the first time. From the light
curve analysis, we derived the first rough estimates of the physical properties
of these systems. We find that the analyzed systems are somewhat similar to
each other. Both contain low-mass components of similar types, both are close
to the Sun, both have short orbital period, and both contain another low-mass
companions on longer orbits of a few years. In the case of GK Boo, both
components are probably of K3 spectral type, while the distant companion is
probably a late M star. The light curve of GK Boo is asymmetric, which probably
causes the shift in the secondary minima in the O-C diagram. System AE For
comprises two K7 stars, and the third body is a possible brown dwarf with a
minimal mass of only about 47 Jupiter Mass. We succeed in completing period and
light curve analyses of both systems, although a more detailed spectroscopic
analysis is needed to confirm the physical parameters of the components to a
higher accuracy.
View original:
http://arxiv.org/abs/1201.4973
No comments:
Post a Comment