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HD 190336 a new beta Cep star

Hajdu, G.; Jurcsik, J.; Sodor, A.

HD 190336 (B0.7 II-III) is shown to be a multiperiodic beta Cep variable based on the publicly available HAT-5, Integral/OMC, and Hipparcos data.

236 Minima Timings of Eclipsing Binaries Observed by Integral OMC

Sobotka, P.

236 times of minima of 97 eclipsing binaries observed by ESA INTEGRAL OMC are presented.

Rapid Variations in RS Oph Observed by OMC/INTEGRAL

Hudec, R.; Hroch, F.; Simon, V.

XX Ophiuchi in Deep Minimum after 37 Years

Sobotka, P.

XX Ophiuchi is a unique object, which is very difficult to classify. This star only slowly varied around the maximum magnitude (V approx 9 mag) during the past 37 years. In March 2004, the brightness started to fade by 0.2 mag per month. I stress the urgent need of the spectroscopic observations during this minimum.

X-Ray Rotational Modulation in VXR45

Micela, G.; Peres, G.; Sciortino, S. +1 more

We present evidence of X-ray rotational modulation on VXR45, a young very fast rotator star member of IC2391 open cluster, observed with XMM-Newton observatory.

PZ Mon - An Active Evolved Star

Saar, Steven H.

An Hipparcos parallax and new high-resolution spectra show that PZ Mon, long considered a spotted UV Ceti flare star, is actually a distant active giant (K1III+?), probably an RS CVn, with km s