The 11-year activity cycle of the Sun is a consequence of a dynamo process occurring beneath its surface. We analyzed photometric data obtained by the CoRoT space mission, showing solarlike oscillations in the star HD49933, for signatures of stellar magnetic activity. Asteroseismic measurements of global changes in the oscillation frequencies and

CBET 2411 available at Central Bureau for Astronomical Telegrams.

Not Available

We observed the black hole candidate XTE J1752-223 (ATel #2258) with the William Herschel Telescope (WHT) and the ACAM imager/spectrograph at the Observatorio del Roque de los Muchachos, La Palma, Spain. Two R-band exposures of 60 and 200 s and one I-band exposure of 200 s were taken under photometric conditions and 1.0-1.2-arcsec seeing on Aug 8

The globular cluster ω Centauri (NGC 5139) is a puzzling stellar system harboring several distinct stellar populations whose origin still represents a unique astrophysical challenge. Current scenarios range from primordial chemical inhomogeneities in the mother cloud to merging of different sub-units and/or subsequent generations of enriched stars

The Very Small Array (VSA) has been used to survey the l ~ 27° to region of the Galactic plane at a resolution of 13arcmin. This l-range covers a section through the Local, Sagittarius and the Cetus spiral arms. The survey consists of 44 pointings of the VSA, each with an rms sensitivity of ~90mJybeam-1. These data are combined in a mosaic to