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Microlensing constraints on the mass of single stars from HST astrometric measurements
Noé Kains, A. Calamida, K. C. Sahu +13
We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stel…
Relativistic deflection of background starlight measures the mass of a nearby white dwarf star
Kailash C. Sahu, Jay Anderson, Stefano Casertano +12
Gravitational deflection of starlight around the Sun during the 1919 total solar eclipse provided measurements that confirmed Einstein's general theory of relativity. We have used…
Just how hot are the Centauri extreme horizontal branch pulsators?
M. Latour, S. K. Randall, P. Chayer +5
Past studies based on optical spectroscopy suggest that the five Cen pulsators form a rather homogeneous group of hydrogen-rich subdwarf O stars with effective temperatures of…
The not so simple globular cluster Cen. I. Spatial distribution of the multiple stellar populations
A. Calamida, G. Strampelli, A. Rest +8
We present a multi-band photometric catalog of 1.7 million cluster members for a field of view of 2x2 degree across Cen. Photometry is based on images colle…