The projection factor, period–radius relation, and surface–brightness colour relation in classical cepheids
نویسندگان
چکیده
منابع مشابه
On the Theoretical Period-Radius Relation of Classical Cepheids
We present the results of a comprehensive theoretical investigation on the Period-Radius (PR) relation of classical Cepheids based on new sequences of full amplitude, nonlinear convective models constructed by adopting a wide range of both stellar masses and chemical compositions. In the period range 0.9 ≤ logP ≤ 1.8 a very good agreement is found between theoretical predictions and current ava...
متن کاملOn the Period-Luminosity-Color Relation of Classical Cepheids
We present the comparison between theoretical and empirical PL relations in V and I bands for the Large Magellanic Cloud. We found that, within the current intrinsic dispersions, theoretical predictions are in remarkable agreement with observational data. We also discuss the PLC relations in (V,B-V) and (V,V-I) as well as the dependence of distance determinations on uncertainties in colors, in ...
متن کاملHigh - resolution spectroscopy for Cepheids distance determination II . A period - projection factor relation
Context. The projection factor is a key quantity for the interferometric Baade-Wesselink (hereafter IBW) and surfacebrightness (hereafter SB) methods of determining the distance of Cepheids. Indeed, it allows a consistent combination of angular and linear diameters of the star. Aims. We aim to determine consistent projection factors that include the dynamical structure of the Cepheids’ atmosphe...
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15 صفحه اولPeriod-Luminosity Relation for Type II Cepheids
We have estimated JHKs magnitudes corrected to mean intensity for LMC type II Cepheids found in the OGLE-III survey. Period-luminosity relations (PLRs) are derived in JHKs as well as in a reddening-free V I parameter. The BL Her stars (P < 4 d) and the W Vir stars (P = 4 to 20 d) are co-linear in these PLRs. The slopes of the infrared relations agree with those found previously for type II Ceph...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20078225