We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4-321857 and 1RXS J171824.2-402934, for which previously single X-ray bursts were detected with the Wide Field Cameras (WFCs) on board BeppoSAX. Both were detected in our Chandra observations in an actively accreting state three to eight years after the

We have obtained metallicity estimates for a sample of A/F-type stars that appear to be members of the recently discovered Monoceros Stream. This sample of candidate main-sequence turn-off stars was chosen from the Sloan Digitized Sky Survey southern program spectra. The average metallicity, = -1.37 ± 0.04, is consistent with the abundance of six

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Radial velocities of epsilon Persei primary component are presented. They are from 15 various sources (observatories, instruments). The journal of data sources in details is in our paper, see Table 2. Each source is designated by number in column 3. (2 data files).

We have identified a new intermediate polar, HS 0943+1404, as part of our ongoing search for cataclysmic variables in the Hamburg Quasar Survey. The orbital and white dwarf spin periods determined from time-resolved photometry and spectroscopy are Porb ≃ 250 min and Pspin= 69.171 ± 0.001 min, respectively. The combination of a large ratio Pspin

Observations of quiescent filaments show very fine structures which suggests that they can be composed of small-scale threads or fibrils. Two-dimensional, high-resolution observations point out that individual fibrils or groups of fibrils may oscillate independently with their own periods. In this paper, we study the fast magnetohydrodynamic modes