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A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring
C. Alcock, R. A. Allsman, D. R. Alves +23
We present a ~ 5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at…
The MACHO Project Hubble Space Telescope Follow-Up: Preliminary Results on the Location of the Large Magellanic Cloud Microlensing Source Stars
C. Alcock, R. A. Allsman, D. R. Alves +21
We attempt to determine whether the MACHO microlensing source stars are drawn from the average population of the LMC or from a population behind the LMC by examining the HST color-…
Galactic Bulge Microlensing Events with Clump Giants as Sources
P. Popowski, C. Alcock, R. A. Allsman +21
We present preliminary results of the analysis of 5 years of MACHO data on the Galactic bulge microlensing events with clump giants as sources. In particular, we discuss: 1) the se…
Searching for periodicities in the MACHO light curve of LMC X-2
C. Alcock, R. A. Allsman, D. R. Alves +23
Using the exceptional long-term monitoring capabilities of the MACHO project, we present here the optical history of LMC X-2 for a continuous 6-yr period. These data were used to i…
The MACHO project: Microlensing Optical Depth towards the Galactic Bulge from Difference Image Analysis
C. Alcock, R. A. Allsman, D. R. Alves +21
We present the microlensing optical depth towards the Galactic bulge based on the detection of 99 events found in our Difference Image Analysis (DIA) survey. This analysis encompas…
The MACHO Project 9 Million Star Color-Magnitude Diagram of the Large Magellanic Cloud
C. Alcock, R. A. Allsman, D. R. Alves +23
We present a 9 million star color-magnitude diagram (9M CMD) of the LMC bar. The 9M CMD reveals a complex superposition of different age and metallicity stellar populations, with i…