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The Optical Gravitational Lensing Experiment. The Distance Scale: Galactic Bulge -- LMC -- SMC.

Udalski, A.

We analyze the mean luminosity of three samples of field RRab Lyr stars observed in the course of the OGLE microlensing experiment: 73 stars from the Galactic bulge and 110 and 128 stars from selected fields in the LMC and SMC, respectively. The fields are the same as in the recent distance determination to the Magellanic Clouds with the red clump…

BVI CCD Photometry of the Globular Cluster 47Tuc

Stanek, K. Z.; Kaluzny, J.; Krzeminski, W. +1 more

We present BVI photometry for about 16000 stars from a 220 square arcmin field centered 8arcmin East of the center of 47 Tuc. We have identified eight likely blue stragglers located in the outer parts of the cluster. Four of these objects are easy targets for spectroscopic studies with ground-based telescopes. Six candidates for blue horizontal br…

Study of Neglected Variable Stars Classified as Type II Cepheids

Szabados, L.; Berdnikov, L. N.

Four variable stars classified as Type II Cepheids have been studied partly based on new photometry and the Hipparcos photometric data. The correct period is derived for V341 Ara and NW Pav and it is pointed out that RR Mic and V1711 Sgr do not belong to Type II Cepheids, instead they may be semi-regular variables. The cycle length of their variab…