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The X-ray off-state of the supersoft source CAL 83 and its interpretation
C. Alcock et al
We consider simultaneous optical data obtained during the recent X-ray turn-off of CAL83. Combining the optical behaviour with the observed X-ray decay time, we show that a model o…
Cepheids in the LMC: Results from the MACHO Project
The MACHO Collaboration, D. L. Welch, C. Alcock +19
The approximately 1500 Cepheid variables in 22 LMC fields of the MACHO Project survey have been calibrated and analysed. In this paper, we report improved period ratios for a total…
RR Lyrae Stars in the MACHO Database
The MACHO Collaboration, D. Minniti, C. Alcock +18
The MACHO Project has catalogued RR Lyrae stars in the Large Magellanic Cloud, in the Galactic bulge, and 50 in the Sgr dwarf galaxy. These variables…
The MACHO Project LMC Variable Star Inventory IV: Multimode RR Lyrae Stars, Distance to the LMC and Age of the Oldest Stars
C. Alcock, R. A. Allsman, D. Alves +16
We report the discovery of 73 double-mode RR Lyrae (RRd) stars in fields near the bar of the LMC. The stars are detected among the MACHO database of short-period variables that cur…
The MACHO Project LMC Microlensing Results from the First Two Years and the Nature of the Galactic Dark Halo
C. Alcock, R. A. Allsman, D. Alves +16
The MACHO Project is a search for dark matter in the form of massive compact halo objects (Machos). Photometric monitoring of millions of stars in the Large Magellanic Cloud (LMC),…
The MACHO Project 2nd Year LMC Microlensing Results and Dark Matter Implications
M. R. Pratt, C. Alcock, R. A. Allsman +16
The MACHO Project is searching for galactic dark matter in the form of massive compact halo objects (Machos). Millions of stars in the Large Magellanic Cloud (LMC), Small Magellani…