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The red clump absolute magnitude based on revised Hipparcos parallaxes
M. A. T. Groenewegen
Over the past decade the use of the red clump (RC) as distance indicator has increased in importance as this evolutionary phase is well populated and a good local calibration exist…
The influence of chemical composition on the properties of Cepheid stars. II-The iron content
M. Romaniello, F. Primas, M. Mottini +6
The Cepheid period-luminosity (PL) relation is unquestionably one of the most powerful tools at our disposal for determining the extragalactic distance scale. While significant pro…
Baade-Wesselink distances and the effect of metallicity in classical cepheids
M. A. T. Groenewegen
The aim of this paper is to investigate the metallicity dependence of the -relation in and based on a sample of 68 Galactic Cepheids with individual Baade-Wesselink dis…
Revised bolometric corrections and interstellar extinction coefficients for the ACS and WFPC2 photometric systems
L. Girardi, J. Dalcanton, B. Williams +8
We present extensive tables of bolometric corrections and interstellar extinction coefficients for the WFPC2 and ACS (both WFC and HRC) photometric systems. They are derived from s…
The distance to the Galactic Centre based on Population-II Cepheids and RR Lyrae stars
M. A. T. Groenewegen, A. Udalski, G. Bono
Context: The distance to the Galactic Centre (GC) is of importance for the distance scale in the Universe. The value derived by Eisenhauer et al. (2005) of 7.62 +- 0.32 kpc based o…
Spectropolarimetry of the Massive Post-Red Supergiants IRC +10420 and HD 179821
M. Patel, R. D. Oudmaijer, J. S. Vink +5
We present medium resolution spectropolarimetry and long term photo-polarimetry of two massive post-red supergiants, IRC +10420 and HD 179821. The data provide new information on t…