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

CBET 2398 available at Central Bureau for Astronomical Telegrams.

In this paper, we consider the reported measurements of black hole spin for black hole X-ray binaries and compare them against the measurements of jet power and speed across all accretion states in these systems. We find no evidence for any correlation between the properties of the jets and the reported spin measurements. These constraints are

The image mosaics obtained with the instrument LIRIS (Long-Slit Intermediate Resolution Infrared Spectrograph) at the Williams Herschel Telescope are in the images directory in the Flexible Image Transport System (FITS) standard. (2 data files).

We used archival multi-band Hubble Space Telescope observations obtained with the Wide Field Camera 3 in the UV-optical channel to present important new observational findings on the color-magnitude diagram (CMD) of the Galactic globular cluster ω Centauri. The UV WFC3 data have been coupled with available Wide Field Channel/Advanced Camera for

Waves observed in the photosphere and chromosphere of sunspots show complex dynamics and spatial patterns. The interpretation of high-resolution sunspot wave observations requires modeling of three-dimensional (3D) nonlinear wave propagation and mode transformation in the sunspot upper layers in realistic spot model atmospheres. Here, we present