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Variable Stars in the Globular Cluster NGC 6752
Thompson, I. B.; Kaluzny, J.
We report time-series photometry for 16 variable stars located in the central part of the globular cluster NGC 6752. The sample includes 13 newly identified objects. The precision of our differential photometry ranges from 1 mmag at V=14.0 mag to 10 mmag at V=18.0 mag. We detected four low amplitude variables located on the extended horizontal bra…
Photometric Survey of Stellar Clusters in the Outer Part of M33. II. Analysis of HST/ACS Images
Kaluzny, J.; Zloczewski, K.
We have used deep ACS/WFC images of M33 to check the nature of extended objects detected by the ground based survey of Zloczewski etal (2008). A total of 24 candidates turned out to be genuine compact stellar clusters. In addition we detected 91 new clusters. Equatorial coordinates, integrated magnitudes and angular sizes are listed for all 115 ob…
An Unusual Eclipsing Blue Straggler V8-NGC 6752
Thompson, I. B.; Kaluzny, J.; Rozyczka, M. +1 more
We report the analysis of a binary blue straggler in NGC 6752 with a short orbital period of 0.315 d and a W UMA-type light curve. We use photometric data spanning 13 years to place limits on the mass ratio (0.15≤q≤0.35), luminosity ratio (L1/L2≈4.0) and the ratio of the radii of the components (r1/r2≈2.…
Interstellar Medium in the M43 Nebula
Gnaciñski, P.
We present a list of interstellar absorption lines in the direction of HD 37061 in the M43 nebula. Some of the absorption lines arise from atomic excited levels that are uncommon in interstellar clouds. The excited levels of FeII are populated by fluorescence. We found a large number of H2 molecular absorption lines arising from vibrati…
The Period and the Cause of Variability of the Magnetic Ap Star V473 Tauri
Jerzykiewicz, M.
The ground based UBV observations and Hipparcos Hp magnitudes of this well known magnetic variable are analyzed. The period of the star's light variation is improved. The improved value, accounting for the available photometric data from the 1963--1964 Lowell observations of Rakosch to the 1990--1993 Hp magnitudes, is equal to 1.4068541±0.0000029 …