5 papers
New Calibrations of Pulsational Absolute Magnitudes of Field RR Lyrae Stars Using Revised Dependencies of Temperatures, Masses, and Periods on Metallicity
Allan Sandage
The pulsational method to estimate the absolute magnitudes of RR Lyrae stars is updated with new data on field-star metallicities by Layden, a new calibration of the (B-V)_0-temper…
Cepheids, Supernovae, Ho, and the Age of the Universe
G. A. Tammann, B. Reindl, F. Thim +2
The local expansion field is mapped using Cepheids, a complete sample of TF distances, and nearby cluster distances. The large-scale field is mapped using Cepheid-calibrated blue S…
The Distance of the Virgo Cluster
G. A. Tammann, A. Sandage, B. Reindl
Six different distance determination methods of Virgo cluster members yield a mean distance modulus of (m-M)^0(Virgo) = 31.60 +/- 0.09 (20.9 +/- 0.9 Mpc). This value can be carried…
The Luminosity Function of Globular Clusters as an Extragalactic Distance Indicator
G. A. Tammann, A. Sandage
The absolute magnitude M* of the peak of the globular cluster luminosity function (GCLF), approximated by a Gaussian, can be calibrated independently in the Galaxy and M 31 through…
The evidence for the long distance scale with H_0<65
Allan Sandage, G. A. Tammann
The status of the determination of the Hubble constant is reviewed, setting out the evidence for the long distance scale with H_0=55+/-5. In parallel, various precepts said to favo…