• Corpus ID: 119086241

Optical Gravitational Lensing Experiment. The Distance Scale: Galactic Bulge - LMC - SMC

  title={Optical Gravitational Lensing Experiment. The Distance Scale: Galactic Bulge - LMC - SMC},
  author={Andrzej Udalski},
  journal={arXiv: Astrophysics},
  • A. Udalski
  • Published 1 April 1998
  • Physics
  • arXiv: Astrophysics
We analyze the mean luminosity of three samples of field RRab Lyr stars observed in the course of the OGLE microlensing experiment: 73 stars from the Galactic bulge and 110 and 128 stars from selected fields in the LMC and SMC, respectively. The fields are the same as in the recent distance determination to the Magellanic Clouds with the red clump stars method by Udalski et al (1998). We determine the relative distance scale d_{GB}:d_{LMC}:d_{SMC} equal to: (0.194+/-0.010):1.00:(1.30+/-0.08… 
The Optical Gravitational Lensing Experiment: Short Distance Scaleto the Large Magellanic Cloud*
We present UBVI photometry of the eclipsing binary HV 2274—the system that has been recently used for distance determination to the LMC by Guinan et al. We determine the interstellar reddening to the
The Optical Gravitational Lensing Experiment: Red Clump Stars as a Distance Indicator.
  • Udalski
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    The Astrophysical journal
  • 2000
The range of metallicity of the Hipparcos sample partially overlaps with met allicity of field giants in the LMC, thus making it possible to determine the distance to the L MC by almost direct comparison of brightness of the local Hipparco red clump giants with that of LMC stars.
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New photometry and spectroscopy for more than a hundred RR Lyrae stars in two fields located close to the bar of the Large Magellanic Cloud (LMC) are used to derive new accurate estimates of the
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The extragalactic distance scale relies heavily on Cepheids. However, it has become clear from observations and pulsation models that the slope and zero point of their P-L relations differ from
Clump Giant Distance to the Magellanic Clouds and Anomalous Colors in the Galactic Bulge.
  • Popowski
  • Physics, Medicine
    The Astrophysical journal
  • 2000
I demonstrate that the two unexpected results in the local universe-(1) anomalous intrinsic (V-I&parr0;0 colors of the clump giants and RR Lyrae stars in the Galactic center, and (2) very short
Old Stellar Populations of the Small Magellanic Cloud
We present WFPC2 and ground-based VI photometry of NGC 121 and a nearby field in the outer SMC. For NGC 121, we measure a true distance modulus of μ0 = 18.96 ± 0.04 (distance of 61.9 ± 1.1 kpc), age
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Recent years have seen a substantial improvement both in photometry of low-luminosity stars in globular clusters and in modeling the stellar atmospheres of late-type dwarfs. We build on these
The Tip of the Red Giant Branch Distance to the Large Magellanic Cloud
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K-band calibration of the red clump luminosity
The average near-infrared (K-band) luminosity of 238 Hipparcos red clump giants is derived and then used to measure the distance to the Galactic center. These Hipparcos red clump giants have been
Harmonizing the RR Lyrae and Clump Distance Scales-Stretching the Short Distance Scale to Intermediate Ranges?
I explore the consequences of making the RR Lyrae and clump giant distance scales consistent in the solar neighborhood, Galactic bulge and Large Magellanic Cloud (LMC). I employ two major