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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…
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),…
MACHO Project Photometry of RR Lyrae Stars in the Sgr Dwarf Galaxy
C. Alcock, R. A. Allsman, D. R. Alves +17
We report the discovery of 30 type a,b RR Lyrae (RRab) which are likely members of the Sagittarius (Sgr) dwarf galaxy. Accurate positions, periods, amplitudes and magnitudes are pr…
The MACHO Project LMC Variable Star Inventory: III. New R Coronae Borealis Stars
C. Alcock, R. A. Allsman, D. R. Alves +18
We report the discovery of two new R Coronae Borealis (RCB) stars in the Large Magellanic Cloud (LMC) using the MACHO project photometry database. The identification of both stars…