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HAT Discovery of 76 Bright Periodic Variable Stars Toward the Galactic Bulge

Nataf D. M., Stanek K. Z., Bakos G. Á.

Acta Astronomica

2010

Vol. 60, No. 3

261--282

We report on photometric I-band observations of 147 bright periodic variable stars toward the Galactic bulge including 76 new discoveries. We used one of the HATnet telescopes to obtain 151 exposures spanning 88 nights in 2005 of an 8.4°×8.4° field of view (FOV) approximately centered on (l,b)=(1.73,-4.68). We observed the Galactic bulge in 2005 as part of a microlensing feasibility study, and here we discuss the periodic variable stars we found in our data. Among our discoveries we count 52 new eclipsing binaries and 24 other periodic variable stars.

Identification and Astrometry of Variable Stars in M3

Bakos G. Á., Benkö J. M., Jurcsik J.

Acta Astronomica

2000

Vol. 50, No. 2

221--248

The space distribution of orbital poles for 252 visual binaries is analyzed to check a possible tendency towards parallelism. It is confirmed that orbital planes do not show any trend to be parallel to the Galactic plane. No strong evidence is found for a preferential orientation of the orbital planes for subgroups of binaries with similar periods and eccentricities. Asymmetry in the distribution of orbital poles is seen only for a subgroup of 19 binaries lying closer than 10 pc. Small differences in the distribution of orbital poles are also detected for subgroups with different location on HR diagram.