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Searching for Variable Stars in the Central Part of the Globular Cluster M22
Pietrukowicz, P.; Kaluzny, J.
Time-series data taken with the Hubble Space Telescope of three fields covering the central part of the globular cluster M22 have been analyzed in search of variable objects. We report identification of eleven periodic variables of which eight are new discoveries. The sample includes five certain contact binaries as well as one SX Phe star. Two ob…
Interstellar Silicon Abundance
Gnacinski, P.
We present 34 measurements of silicon gas phase column densities in the interstellar medium. We have used spectra containing the SiII 1808 Ang line which were obtained with the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope (HST). Extinction curve parameters are determined for analyzed lines of sight and relation bet…