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20 papers · 1 filter
Observational discovery of the AGB-bump in densely populated color-magnitude diagrams of galaxies and star clusters
Carme Gallart
The huge photometric databases that are being created for stars in the Magellanic Clouds and in Local Group galaxies not only allow detailed study of the star formation history of…
The HST Key Project on the Extragalactic Distance Scale XIII. The Metallicity Dependence of the Cepheid Distance Scale
R. Kennicutt, P. Stetson, A. Saha +22
Uncertainty in the metal abundance dependence of the Cepheid variable period- luminosity (PL) relation remains one of the outstanding sources of systematic error in the extragalact…
The Lower Main Sequence and the Orbital Period Distribution of Cataclysmic Variable Stars
J. Christopher Clemens, I. Neill Reid, John E. Gizis +1
The color-magnitude diagram of the lower main sequence, as measured from a volume-limited sample of nearby stars, shows an abrupt downward jump between Mv = 12 and 13. This jump in…
Systematic Biases in Galaxy Luminosity Functions
Julianne J. Dalcanton
Both the detection of galaxies and the derivation of the luminosity function depend upon isophotal magnitudes, implicitly in the first case, and explicitly in the latter. However,…
The Virgo cluster distance from 21 cm-line widths
M. Federspiel, G. A. Tammann, A. Sandage
The distance of the Virgo cluster is derived in the B band from the 21 cm-line width-absolute magnitude relation. The latter is calibrated using 18 spirals with Cepheid distances m…
The Dynamics of the cD Clusters Abell 119 and Abell 133
M. J. Way, H. Quintana, L. Infante
A dynamical analysis of the structure of the clusters of galaxies Abell 119 and Abell 133 is presented, using new redshift data combined with existing data from the literature. We…