19 research outputs found
Light Curve Solutions of Eclipsing Binaries in SMC
We propose a procedure for light-curve solution of eclipsing binary stars in
the Small Magellanic Cloud for which photometric data have been obtained in the
framework of the OGLE project as well as way of determination of the global
stellar parameters on the basis of the obtained solutions, some empirical
relations as well as the distance to the SMC. Several examples illustrate this
procedure.Comment: 10 pages, 2 figures, accepte
2MASS J01074282+4845188: a new nova-like cataclysmic star with a deep eclipse
We present VRI photometry and low-resolution spectroscopy of the object 2MASS
J01074282+4845188. The V-shape of the eclipse, the phase variability of the
colour indices as well as the presence of a pre-eclipse hump, standstill and
flickering allow us to conclude that it is a nova-like cataclysmic star. This
is supported by the observed broad emission Halpha line. Its single profile
with a relatively narrow FWHM but large FWZI is typical for a nova-like
variable of SW Sex subtype. The observed deep eclipses make the newly
discovered cataclysmic star 2MASS J01074282+4845188 an interesting object for
future investigation.Comment: 11 pages ; 5 figures; 3 tables (Accepted for publication in New
Astronomy
GSC 2314-0530: the shortest-period eclipsing system with dMe components
CCD photometric observations in VRI colors and spectroscopic observations of
the newly discovered eclipsing binary GSC 2314-0530 (NSVS 6550671) with dMe
components and very short period of P=0.192636 days are presented. The
simultaneous light-curve solution and radial velocity solution allows to
determine the global parameters of GSC 2314-0530: T_{1}=3735 K; T_{2}=3106 K;
M_{1}=0.51 M_sun; M_{2}=0.26 M_sun; R_{1}=0.55 R_sun; R_{2}=0.29 R_sun;
L_{1}=0.053 L_sun; L_{2}=0.007 L_sun; i=72.5 degr; a=1.28 R_sun; d=59 pc. The
chromospheric activity of its components is revealed by strong emission in the
H_alpha line (with mean EW=5 A) and observed several flares. Empirical
relations mass-M_{bol}, mass-radius and mass-temperature are derived on the
basis of the parameters of known binaries with low-mass dM components.Comment: 10 pages, 11 figures, MNRAS (accepted