The photometric evolution of star clusters and the preferential loss of low-mass bodies-with an application to globular clusters ⋆ ABSTRACT Context. To obtain an accurate description of broad-band photometric star cluster evolution, certain effects should be accounted for. Energy equipartition leads to mass segregation and the preferential loss of low-mass stars, while stellar remnants severely...

We present B and I photometry of OGLE-TR-10 during transits of its giant planet. From our observations, we estimate the radius of the planet to be 1.16± 0.05 times the radius of Jupiter, assuming a stellar mass of M⋆ = 1.02 M⊙. This is smaller than previous estimates that were based on lower-precision data, and hence the planet is not as anomalous as was once believed. We provide updated determ...

This is the first of a series of papers devoted to a global study of the photometric properties of the red stellar sequences in a complete sample of the Large Magellanic Cloud clusters, by means of near infrared array photometry. Deep J,H,Ks photometry and accurate Color Magnitude Diagrams down to K ≈ 18.5, Based on observations collected at the European Southern Observatory, La Silla, Chile, u...

BV RI CCD-based and near-IR (J) imaging, together with unfiltered photometry of the hot subdwarf B star PG 0856+121 are reported. Two close, faint, red, point-like sources are resolved. They account for the previously reported IR excess observed in this hot subdwarf. In addition, the new unfiltered differential photometry of PG 0856+121 confirms its previously reported pulsational nature. A com...

We present resolved stellar photometry of 4 fields along the major axis of the M33 disk from images taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope. The photometry provides a detailed census of the red clump in all fields and reaches the ancient main sequence in the outermost field. Through detailed modeling of the color-magnitude diagrams, we find that the percenta...