Estimation of the galactic spiral pattern speed from Cepheids
نویسندگان
چکیده
منابع مشابه
On the Galactic Spiral Pattern and its Rotation Speed
We report calculations of the stellar and gaseous response to a Milky Way mass distribution model including a spiral pattern with a locus as traced by K-band observations, over imposed on the axisymmetric components in the plane of the disk. The stellar study extends calculations from previous work concerning the self-consistency of the pattern. The stellar response to the imposed spiral mass i...
متن کاملA Plausible Galactic Spiral Pattern and its Rotation Speed
We report calculations of the stellar and gaseous response to a Milky Way mass distribution model including a spiral pattern with a locus as traced by K-band observations, over imposed on the axisymmetric components in the plane of the disk. The stellar study extends calculations from previous work concerning the self-consistency of the pattern. The stellar response to the imposed spiral mass i...
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Most late-type stars in the solar neighborhood have velocities similar to the local standard of rest (LSR), but there is a clearly separated secondary component corresponding to a slower rotation and a mean outward motion. Detailed simulations of the response of a stellar disk to a central bar show that such a bi-modality is expected from outer-Lindblad resonant scattering. When constraining th...
متن کاملThe galactic double – mode Cepheids
By considering the least–squares fits of the double–mode Cepheid light curves discussed in Paper I we defined their properties by their Fourier parameters and generalized phase differences G i,j. When plotting the latter quantities as a function of the respective order, the second order terms are confined in the region just below 3/2π; the third order terms have π/2 < G i,j < π, the fourth orde...
متن کاملMultiplicity of Galactic Cepheids from long-baseline interferometry
Context. More than 60% of Cepheids are in binary or multiple systems. Studying such systems could lead to a better understanding of the age and evolution of Cepheids. These are also useful tools to estimate the mass of Cepheids, and constrain theoretical models of their pulsation and evolution. Aims. We aim at determining the masses of Cepheids in binary systems, as well as their geometric dist...
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ژورنال
عنوان ژورنال: Astronomy Letters
سال: 2012
ISSN: 1063-7737,1562-6873
DOI: 10.1134/s1063773712100015