منابع مشابه
Comments on “ The long - period Galactic Cepheid RS Puppis . I . A geometric distance from its light echoes ”
Context. The luminous Galactic Cepheid RS Puppis is unique in being surrounded by a dust nebula illuminated by the variable light of the Cepheid. In a recent paper in this journal, Kervella et al. (2008) report a very precise geometric distance to RS Pup, based on measured phase lags of the light variations of individual knots in the reflection nebula. Aims. In this commentary, we examine the v...
متن کاملThe Nebulosity and Distance of the Cepheid RS Puppis
Adopting a distance for RS Pup derived from a period-luminosity relation based on Cepheid parallaxes, it is shown that the phase-lag observations of the surrounding nebulosity by Kervella et al. are well fitted by a model of an equatorial disc at an angle of 8◦.1± 0◦.6 to the plane of the sky. The astrophysical implications of this are briefly mentioned.
متن کاملThe extra-galactic Cepheid distance scale from LMC and Galactic period-luminosity relations
In this paper, we recalibrate the Cepheid distance to some nearby galaxies observed by the HST Key Project and the Sandage-Tammann-Saha group. We use much of the Key Project methodology in our analysis but apply new techniques, based on Fourier methods to estimate the mean of a sparsely sampled Cepheid light curve, to published extra-galactic Cepheid data. We also apply different calibrating PL...
متن کاملThe Intermediate-period Cepheid Strip Stars
To explore the population of variable stars that fall between RR Lyrae stars and classical Cepheids, we have obtained extensive photometric observations for 56 stars with periods between 0.6 and 1.0 days. For these stars and an additional 10, we have examined the form and stability of the light curves to explore the variety of types of stars in this period regime. We conclude that the majority ...
متن کاملOn the Normalizationof Cepheid Period-luminosity Relationships
Results of stellar evolution calculations and results of non-adiabatic stellar pulsation calculations can be used to construct theoretical , composition-dependent, short period boundaries (or \blue edges") of the instability strip in the period-luminosity plane for Cepheids pulsating in the fundamental and rst overtone radial modes. The slopes of these blue edges are very similar to the slopes ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201117674