The MACHO Project HST Follow-Up: The Large Magellanic Cloud Microlensing Source Stars (2009)
Nelson, C. A., Drake, A. J., Cook, K. H., Bennett, D. P., Popowski, P., Dalal, N., ...
We present Hubble Space Telescope (HST) WFPC2 photometry of 13 microlensed source stars from the 5.7 year Large Magellanic Cloud (LMC) survey conducted by the MACHO Project. The microlensing source...
Mass-Losing Semiregular Variable Stars in Baade's Windows (2005)
Alard, C., Blommaert, J., Cesarsky, C., Epchtein, N., Felli, M., Fouque, P., ...
By cross-correlating the results of two recent large-scale surveys, the general properties of a well defined sample of semi-regular variable stars have been determined. ISOGAL mid-infrared photometry...
Microlensing optical depth toward the galactic bulge using clump giants from the MACHO survey (2005)
Popowski, P., Griest, K., Thomas, C. L., Cook, K. H., Bennett, D. P., Becker, A. C., ...
Galactic bulge microlensing events from the MACHO Collaboration (2005)
Thomas, C. L., Griest, K., Popowski, P., Cook, K. H., Drake, A. J., Minniti, D., ...
Extinction toward the galactic bulge from RR Lyrae stars (2005)
Kunder, A. M., Popowski, P., Cook, K. H., Nikolaev, S., Chaboyer, B.
Popowski, P., Griest, K., Thomas, C. L., Cook, K. H., Bennett, D. P., Becker, A. C., ...
Using 7 years of MACHO survey data, we present a new determination of the optical depth to microlensing towards the Galactic bulge. We select the sample of 62 microlensing events (60 unique) on clump...
Galactic Bulge Microlensing Events from the MACHO Collaboration (2004)
Thomas, C. L., Griest, K., Popowski, P., Cook, K. H., Drake, A. J., Minniti, D., ...
We present a catalog of 450 high signal-to-noise microlensing events observed by the MACHO collaboration between 1993 and 1999. The events are distributed throughout our fields and, as expected, they...
Alcock, C., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Clement, C. M., ...
Fourier coefficents have been derived for the $V$ and $R$ light curves of 785 overtone RR Lyrae variables in 16 MACHO fields near the bar of the LMC. The $\phi_{31}$ and $R_{21}$ coefficients have...
Alcock, C., Alves, D. R., Becker, A., Bennett, D., Cook, K. H., Drake, A., ...
We have frequency analyzed 6391 variables classified earlier as fundamental mode RR Lyrae (RR0) stars in the MACHO database on the Large Magellanic Cloud (LMC). The overwhelming majority of these...
Recent Microlensing Results from the MACHO Project (2003)
Popowski, P., Nelson, C. A., Bennett, D. P., Drake, A. J., Vandehei, T., Griest, K., ...
We describe a few recent microlensing results from the MACHO Collaboration. The aim of the MACHO Project was the identification and quantitative description of dark and luminous matter in the Milky...
Variability-selected quasars in MACHO project Magellanic Cloud fields (2003)
Geha, M., Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., ...
We present 47 spectroscopically confirmed quasars discovered behind the Magellanic Clouds identified via photometric variability in the MACHO database. Thirty-eight quasars lie behind the Large...
Variability-Selected Quasars in MACHO Project Magellanic Cloud Fields (2002)
Geha, M., Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., ...
We present 47 spectroscopically-confirmed quasars discovered behind the Magellanic Clouds identified via photometric variability in the MACHO database. Thirty-eight quasars lie behind the Large...
MACHO Project Analysis of the Galactic Bulge Microlensing Events with Clump Giants as Sources (2002)
Popowski, P., Vandehei, T., Griest, K., Alcock, C., Allsman, R. A., Alves, D. R., ...
We present preliminary results of the analysis of 5 years of MACHO data on the Galactic bulge microlensing events with clump giants as sources. This class of events allows one to obtain robust...
Alcock, C., Allsman, R. A., Alves, D. R., Becker, A. C., Bennett, D. P., Cook, K. H., ...
We present a method for solving the lightcurve of an eclipsing binary system which contains a Cepheid variable as one of its components as well as the solutions for three eclipsing Cepheids in the...
Correcting parameters of events based on the entropy of microlensing ensemble (2002)
We entertain the idea that robust theoretical expectations can become a tool in removing hidden observational or data- reduction biases. We illustrate this approach for a specific problem associated...
Gravitational microlensing events due to stellar-mass black holes (2002)
Bennett, D. P., Becker, A. C., Quinn, J. L., Tomaney, A. B., Alcock, C., Allsman, R. A., ...
We present an analysis of the longest timescale microlensing events discovered by the MACHO Collaboration during a 7 year survey of the Galactic bulge. We find six events that exhibit very strong...
Alcock, C., Allsman, R. A., Alves, D. R., Becker, A. C., Bennett, D. P., Cook, K. H., ...
We present a method for solving the light curve of an eclipsing binary system that contains a Cepheid variable as one of its components as well as the solutions for three eclipsing Cepheids in the...
Gravitational Microlensing Events Due to Stellar Mass Black Holes (2001)
Bennett, D. P., Becker, A. C., Quinn, J. L., Tomaney, A. B., Alcock, C., Allsman, R. A., ...
We present an analysis of the longest timescale microlensing events discovered by the MACHO Collaboration during a 7 year survey of the Galactic bulge. We find 6 events that exhibit very strong...
The MACHO Project LMC Variable Star Inventory: X. The R Coronae Borealis Stars (2001)
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A., Bennett, D. P., ...
We report the discovery of eight new R Coronae Borealis (RCB) stars in the Large Magellanic Cloud (LMC) using the MACHO project photometry database. The discovery of these new stars increases the...
Mass-Losing Semiregular Variable Stars in Baade's Windows (2001)
Alard, C., Blommaert, J., Cesarsky, C., Epchtein, N., Felli, M., Fouque, P., ...
By cross-correlating the results of two recent large-scale surveys, the general properties of a well defined sample of semi-regular variable stars have been determined. ISOGAL mid-infrared photometry...
Mass-Losing Semiregular Variable Stars in Baade's Windows (2001)
Alard, C., Blommaert, J., Cesarsky, C., Epchtein, N., Felli, M., Fouque, P., ...
By cross-correlating the results of two recent large-scale surveys, the general properties of a well defined sample of semi-regular variable stars have been determined. ISOGAL mid-infrared photometry...
Mass-Losing Semiregular Variable Stars in Baade's Windows (2001)
Alard, C., Blommaert, J., Cesarsky, C., Epchtein, N., Felli, M., Fouque, P., ...
By cross-correlating the results of two recent large-scale surveys, the general properties of a well defined sample of semi-regular variable stars have been determined. ISOGAL mid-infrared photometry...
MACHO 96-LMC-2: Lensing of a Binary Source in the LMC and Constraints on the Lensing Object (2000)
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
We present photometry and analysis of the microlensing alert MACHO 96-LMC-2. The ~3% photometry provided by the Global Microlensing Alert Network follow--up effort reveals a periodic modulation in...
MACHO Project Limits on Black Hole Dark Matter in the 1-30 Solar Mass Range (2000)
Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
We report on a search for long duration microlensing events towards the Large Magellanic Cloud. We find none, and therefore put limits on the contribution of high mass objects to the Galactic dark...
A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring (2000)
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
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 P = 420.8 +/- 0.8...
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
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-magnitude diagram...
Galactic Bulge Microlensing Events with Clump Giants as Sources (2000)
Popowski, P., Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., ...
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 selection of `giant'...
Alcock, C., Allsman, R., Alves, D. R., Axelrod, T., Becker, A., Bennett, D., ...
More than 1300 variables classified provisionally as first overtone RR Lyrae pulsators in the MACHO variable star database of the Large Magellanic Cloud (LMC) have been subjected to standard...
The MACHO Project: Microlensing Detection Efficiency (2000)
Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
The MACHO project is a search for dark matter in the form of massive compact halo objects (MACHOs). The project has photometrically monitored tens of millions of stars in the Large Magellanic Cloud...
Searching for periodicities in the MACHO light curve of LMC X-2 (2000)
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
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 investigate the...
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
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 encompasses three years of...
The MACHO Project 9 Million Star Color-Magnitude Diagram of the Large Magellanic Cloud (2000)
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Basu, A., Becker, A. C., ...
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 important stellar...
The MACHO Project: Microlensing Results from 5.7 Years of LMC Observations (2000)
Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
We report on our search for microlensing towards the Large Magellanic Cloud (LMC). Analysis of 5.7 years of photometry on 11.9 million stars in the LMC reveals 13 - 17 microlensing events. This is...
Searching for periodicities in the MACHO light curve of LMC X-2 (2000)
Alcock, C., Allsman, R.A., Alves, D.R., Axelrod, T.S., Becker, A.C., Bennet, D.P., ...
The Distance to the LMC via the Eclipsing Binary HV 2274 (1999)
Nelson, C. A., Cook, K. H., Popowski, P., Alves, D. A.
We present UBV photometry of the eclipsing binary Harvard Variable 2274 in the Large Magellanic Cloud (LMC). The stellar parameters of this binary system were calculated by Guinan et al. (1998a) who...
The Zero Point of Extinction Toward Baade's Window From RR Lyrae Stars (1997)
Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ...
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 (V-K)_0 colors as a...
Pure partial trisomy of the short arm of chromosome 5 (1989)
Blois, M C, Peeters, M, Popowski, P, Pangalos, C, Lejeune, J
We describe a male infant with multiple dysmorphic features who is trisomic for chromosome segment 5p13.32----5p14.2 as a result of recombination aneusomy. His father is a balanced carrier of an...