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Properties of RR Lyrae stars in the inner regions of the Large Magellanic Cloud. II. The extended sample
J. Borissova, D. Minniti, M. Rejkuba +1
All galaxies that have been adequately examined so far have shown an extended stellar halo. To search for such a halo in the LMC we have obtained low-resolution spectra for 100 LMC…
Galactic Bulge Microlensing Events from the MACHO Collaboration
C. L. Thomas, K. Griest, P. Popowski +21
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…
Microlensing Optical Depth towards the Galactic Bulge Using Clump Giants from the MACHO Survey
P. Popowski, K. Griest, C. L. Thomas +20
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 (…
Structure of the Periphery of the Large Magellanic Cloud Revealed by 2MASS
David R. Alves
This paper has been withdrawn.
Properties of RR Lyrae stars in the Inner Regions of the Large Magellanic Cloud
J. Borissova, D. Minniti, M. Rejkuba +3
We present the radial velocities, metallicities and the K-band magnitudes of 74 RR Lyrae stars in the inner regions of the LMC. The intermediate resolution spectra and infrared ima…
The Mass of the MACHO-LMC-5 Lens Star
Andrew Gould, David P. Bennett, David R. Alves
We combine the available astrometric and photometric data for the 1993 microlensing event MACHO-LMC-5 to measure the mass of the lens, M=0.097 +/- 0.016 Msun. This is the most prec…
The Stellar Halo in the Large Magellanic Cloud: Mass, Luminosity, and Microlensing Predictions
David R. Alves
Recently obtained kinematic data has shown that the Large Magellanic Cloud (LMC) possesses an old stellar halo. In order to further characterize the properties of this halo, parame…
MEGA: Microlensing Exploration of the Galaxy and Andromeda
David R. Alves, Edward A. Baltz, Arlin Crotts +3
This paper has been withdrawn.
A Review of the Distance and Structure of the Large Magellanic Cloud
David R. Alves
The average of 14 recent measurements of the distance to the Large Magellanic Cloud (LMC) implies a true modulus of 18.50 +- 0.02 mag, and demonstrates a trend in the past 2 years…
The MACHO Project Large Magellanic Cloud Variable Star Inventory. XIII. Fourier Parameters for the First Overtone RR Lyrae Variables and the LMC Distance
C. Alcock, D. R. Alves, T. S. Axelrod +21
Fourier coefficents have been derived for the and light curves of 785 overtone RR Lyrae variables in 16 MACHO fields near the bar of the LMC. The and coef…
Kinematic Evidence for an Old Stellar Halo in the Large Magellanic Cloud
Dante Minniti, Jura Borissova, Marina Rejkuba +3
The oldest and most metal-poor Milky Way stars form a kinematically hot halo, which motivates the two major formation scenarios for our galaxy: extended hierarchical accretion and…
The MACHO Project Large Magellanic Cloud variable star inventory. XI. Frequency analysis of the fundamental mode RR Lyrae stars
C. Alcock, D. R. Alves, A. Becker +20
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 ma…
Recent Microlensing Results from the MACHO Project
P. Popowski, C. A. Nelson, D. P. Bennett +19
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 ma…
Building the MEGA Image-Subtraction Pipeline in the Era of Virtual Observatories
David R. Alves, A. P. S. Crotts, A. Bergier +2
This paper has been withdrawn.
Population II standard candle calibration of the Fundamental Plane of groups and clusters of galaxies and the Hubble Constant
David R. Alves
This paper has been withdrawn by the author.
Variable Stars in M31's Globular Clusters
David R. Alves, Alex Bergier, Arlin Crotts +1
This paper has been withdrawn.
Variability-Selected Quasars in MACHO Project Magellanic Cloud Fields
M. Geha, C. Alcock, R. A. Allsman +22
We present 47 spectroscopically-confirmed quasars discovered behind the Magellanic Clouds identified via photometric variability in the MACHO database. Thirty-eight quasars lie beh…
K-Band Red Clump Distance to the Large Magellanic Cloud
David R. Alves, Marina Rejkuba, Dante Minniti +1
The Hipparcos I-band calibration of horizontal-branch red clump giants as standard candles has lead to controversial results for the distance to the Large Magellanic Cloud (LMC). I…
New Understanding of Large Magellanic Cloud Structure, Dynamics and Orbit from Carbon Star Kinematics
Roeland P. van der Marel, David R. Alves, Eduardo Hardy +1
We derive general expressions for the LMC velocity field which we fit to kinematical data for 1041 carbon stars. We demonstrate that all previous studies of LMC kinematics have mad…
MACHO Project Analysis of the Galactic Bulge Microlensing Events with Clump Giants as Sources
P. Popowski, T. Vandehei, K. Griest +19
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 o…
The MACHO Project LMC Variable Star Inventory: XII. Three Cepheid Variables in Eclipsing Binaries
C. Alcock, R. A. Allsman, D. R. Alves +22
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…
Gravitational Microlensing Events Due to Stellar Mass Black Holes
D. P. Bennett, A. C. Becker, J. L. Quinn +28
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 exhibi…
Post-AGB Stars in Globular Clusters and Galactic Halos
Howard E. Bond, David R. Alves
We discuss three aspects of post-AGB (PAGB) stars in old populations. (1) HST photometry of the nucleus of the planetary nebula (PN) K 648 in the globular cluster (GC) M15 implies…
The MACHO Project LMC Variable Star Inventory: X. The R Coronae Borealis Stars
C. Alcock, R. A. Allsman, D. R. Alves +26
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 star…