The Baade-Wesselink p-factor applicable to LMC Cepheids
N. Nardetto; A. Fokin; P. Fouqué; J. Storm; W. Gieren; G. Pietrzynski; D. Mourard; P. Kervella · 2011 · arXiv
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Abstract (excerpt)
Context. Recent observations of LMC Cepheids bring new constraints on the slope of the period-projection factor relation (hereafter Pp relation) that is currently used in the Baade-Wesselink (hereafter BW) method of distance determination. The discrepancy between observations and theoretical analysis is particularly significant for short period Cepheids Aims. We investigate three physical effects that might possibly explain this discrepancy: (1) the spectroscopic S/N that is systematically lower for LMC Cepheids (around 10) compared to Galactic ones (up to 300), (2) the impact of the metallici
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Metadata source: arXiv