Raman scattering in symbiotic stars. II. Numerical models
نویسندگان
چکیده
منابع مشابه
Raman Scattering Wings of Hα in Symbiotic Stars
Nussbaumer et al. (1989) proposed that broad Hα wings can be formed through Raman scattering of Lyβ photons, and in this Letter we argue that the Hα wings prevalently seen in symbiotic stars may be indeed formed in this way. Assuming a flat incident UV radiation around Lyβ, we generate template wing profiles around Hα that are formed through Raman scattering in a plane-parallel H I region. We p...
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A Monte Carlo method is used to calculate the profiles and the polarization of the Raman scattered O VI lines (λλ6827, 7088) in symbiotic stars, which are believed to be a binary system of a cool giant and a hot star with an emission nebula around it. A point-like isotropic UV radiation source is assumed and a simple spherical wind model is adopted for the kinematics of the scattering material ...
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We present accurate UBV(RI)C photometric sequences for an additional 20 symbiotic stars. As for the 20 targets of Paper I, the sequences extend over wide brightness and color ranges, and are suited to cover both quiescence and outburst phases. The sequences are intended to assist both present time photometry as well as measurement of photographic plates from historical archives.
متن کاملSymbiotic stars in X-rays
Until recently, symbiotic binary systems in which a white dwarf accretes from a red giant were thought to be mainly a soft X-ray population. Here we describe the detection with the X-ray Telescope (XRT) on the Swift satellite of 9 white dwarf symbiotics that were not previously known to be X-ray sources and one that was previously detected as a supersoft X-ray source. The 9 new X-ray detections...
متن کاملContemporaneous UV and Optical Observations of Direct and Raman Scattered O VI Lines in Symbiotic Stars
Symbiotic stars are binary systems consisting of a hot star, typically a white dwarf, and a cool giant companion. The wind from the cool star is ionized by the radiation from the hot star, resulting in the characteristic combination of sharp nebular emission lines and stellar molecular absorption bands in the optical spectrum. Most of the emission lines are readily identifiable with common ions...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 1997
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1997110