Research

Stars Group

Chemical Abundances

Compact Objects

Cool Stars

Galactic Structure

Space Astrometry

Stellar Clusters

Stellar Pulsation

Whole Earth Telescope

Stars Group : Galactic Structure

Thomas G Barnes III, G. Fritz Benedict, Barbara McArthur


ADS | astro-ph

Thomas G Barnes III  

Superintendent McDonald Observatory

website

Research Interests

Observational aspects of variable stars, particularly distance scale issues for Cepheid and RR Lyrae variables.

Group Areas

Stars, Galactic Structure, Stellar Pulsation


ADS | astro-ph

G. Fritz Benedict  

Senior Research Scientist

website

Research Interests

Space astrometry; search for extrasolar planetary systems; surface photometry of galaxies; barred galaxies.

Group Areas

Planetary Systems, Extrasolar Planetary Systems, Stars, Cool Stars, Galactic Structure, Space Astrometry


ADS | astro-ph

Barbara McArthur  

Research Affiliate-Research Fellow

Research Interests

HST Astrometry; search for extrasolar planets.

Group Areas

Planetary Systems, Extrasolar Planetary Systems, Stars, Cool Stars, Galactic Structure, Space Astrometry



The absolute magnitudes in the K band from the ISB distances of Milky Way, LMC and SMC Cepheids, all calculated with the revised p-factor law of this paper. The solid line is the best fit to the Milky Way Cepheid data. The dashed line is the Persson et al. (2004) K-band PL relation for the LMC, for an assumed LMC distance modulus of 18.50. The slopes of the PL relations for both the LMC and Milky Way derived from the ISB technique agree now very well with the slope of the observed K-band relation in the LMC. The slight mean offset of the 5 SMC Cepheids from the Galactic relation has been used by Storm et al. (2004) to constrain the metallicity effect on the zero point of the PL relation.

from

Direct Distances to Cepheids in the Large Magellanic Cloud: Evidence for a Universal Slope of the Period-Luminosity Relation up to Solar Abundance astro-ph

Large Magellanic Cloud.