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The LMC eclipsing binary HV 2274 revisited
M. A. T. Groenewegen, M. Salaris
We reanalyse the UV/optical spectrum and optical broad-band data of the eclipsing binary HV 2274 in the LMC, and derive its distance following the method given by Guinan et al. (19…
LMC and SMC Cepheids: combining OGLE with DENIS 2MASS infrared data
Martin A. T. Groenewegen
(Abridged) I cross-correlate the OGLE database of Cepheids in the Large and Small Magellanic Clouds (MCs) with the second incremental release of the 2MASS JHK survey, and the DENIS…
Multi-colour PL-relations of Cepheids in the Hipparcos catalogue and the distance to the LMC
M. A. T. Groenewegen, R. D. Oudmaijer
We analyse a sample of 236 Cepheids from the Hipparcos catalog, using the method of ``reduced parallaxes'' in V, I, K and the reddening-free ``Wesenheit-index''. We compare our sam…
Atomic diffusion in metal poor stars. The influence on the Main Sequence fitting distance scale, subdwarfs ages and the value of Delta Y/DeltaZ
M. Salaris, M. A. T. Groenewegen, A. Weiss
The effect of atomic diffusion on the Main Sequence (MS) of metal-poor low mass stars is investigated. Since diffusion alters the stellar surface chemical abundances with respect t…