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J/AcA/58/293 VI lc of LMC type II & anomalous Cepheids (Soszynski+, 2008)
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Beginning of ReadMe :J/AcA/58/293 Type-II and anomalous Cepheids in LMC (Soszynski+, 2008)
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The Optical Gravitational Lensing Experiment. The OGLE-III catalog of variable
stars.
II. Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud.
Soszynski I., Udalski A., Szymanski M.K., Kubiak M., Pietrzynski G.,
Wyrzykowski L., Szewczyk O., Ulaczyk K., Poleski R.
<Acta Astron. 58, 293 (2008)>
=2008AcA....58..293S
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ADC_Keywords: Magellanic Clouds ; Stars, variable ; Magnitudes
Keywords: Cepheids - stars: oscillations - stars: population II -
Magellanic Clouds
Abstract:
In the second part of the OGLE-III Catalog of Variable Stars
(OIII-CVS) we present 197 type II Cepheids and 83 anomalous Cepheids
in the Large Magellanic Cloud (LMC). The sample of type II Cepheids
consists of 64 BL Her stars, 96 W Vir stars and 37 RV Tau stars.
Anomalous Cepheids are divided into 62 fundamental-mode and 21
first-overtone pulsators. These are the largest samples of such types
of variable stars detected anywhere outside the Galaxy.
Description:
We present the period-luminosity and color-magnitude diagrams of stars
in the sample. If the boundary period between BL Her and W Vir stars
is adopted at 4 days, both groups differ significantly in (V-I)
colors. We identify a group of 16 peculiar W Vir stars with different
appearance of the light curves, brighter and bluer than ordinary stars
of that type. Four of these peculiar W Vir stars show additional
eclipsing modulation superimposed on the pulsation light curves. Four
other stars of that type show long-period secondary variations which
may be ellipsoidal modulations. It suggests that peculiar W Vir
subgroup may be related to binarity. In total, we identified seven
type II Cepheids simultaneously exhibiting eclipsing variations which
is a very large fraction compared to classical Cepheids in the LMC.