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First detection of a gravitational microlensing candidate towards the Small Magellanic Cloud
The MACHO Collaboration, C. Alcock, R. A. Allsman +20
We report the first discovery of a gravitational microlensing candidate towards a new population of source stars, the Small Magellanic Cloud (SMC). The candidate event's light curv…
Bulge delta Scuti Stars in the MACHO Database
The MACHO Collaboration, C. Alcock, R. A. Allsman +20
We describe the search for delta Scuti stars in the MACHO database of bulge fields. Concentrating on a sample of high amplitude delta Scutis, we examine the light curves and pulsat…
The RR Lyrae Population of the Galactic Bulge from the MACHO Database
The MACHO Collaboration, C. Alcock, R. A. Allsman +21
Mean colors and magnitudes of RR Lyrae stars in 24 fields towards the Galactic bulge from the MACHO database are presented. Accurate mean reddenings are computed for these fields o…
The Zero Point of Extinction Toward Baade's Window From RR Lyrae Stars
C. Alcock, R. A. Allsman, D. R. Alves +20
We measure the zero point of the Stanek (1996) extinction map by comparing the observed (V-K) colors of 20 RR Lyrae stars (type ab) found in the MACHO survey with their intrinsic (…
MACHO Alert 95-30 : First Real-Time Observation of Extended Source Effects in Gravitational Microlensing
C. Alcock, W. H. Allen, R. A. Allsman +54
We present analysis of MACHO Alert 95-30, a dramatic gravitational microlensing event towards the Galactic bulge whose peak magnification departs significantly from the standard po…
Optical photometry of the eclipsing Large Magellanic Cloud supersoft source CAL 87
C. Alcock
We present optical photometry of the eclipsing supersoft source, CAL87. These observations comprise long term data accumulated as a by-product of the MACHO Project, and high speed…