منابع مشابه
The X-ray Spectra of Symbiotic Stars
Symbiotic stars are thought to show distinct X-ray emission from the accreting object and from the colliding winds of the two stars. I show that the colliding wind component is unnecessary. Instead, the spectra can be interpreted as emission only from the compact object that is strongly absorbed by the partially-ionised wind of the red giant. There remains no evidence of any X-ray emission from...
متن کاملInfrared spectra of young stars in Chamaeleon
We present infrared spectra covering the wavelength ranges 3.1–5.0 μm and 5.8–11.6 μm for 9 young stars located in the Chamaeleon I dark cloud. The spectra were taken with the spectrophotometer of ISO (ISOPHOT-S). The spectra of three stars which illuminate reflection nebulae are dominated by the series of strong emission features generally ascribed to polycyclic aromatic hydrocarbons. Three or...
متن کاملCircumstellar Molecular Spectra towards Evolved Stars
In this paper we discuss the relevance of, and possible scientific gains which can be acquired from studying circumstellar molecular spectra toward evolved stars. Where can we expect circumstellar molecular spectra, why would we want to study these spectra, which molecules might be present, and what can we learn from these studies? We present an overview of reported detections, and discuss some...
متن کاملEnergy production in stars.
where M= 1.99.1033 g is the sun’s mass, R= 6.g6.10’0 cm its radius, and G= 6.6710 the gravitational constant. A similar energy was set free when the sun was assembled from interstellar gas or dust in the dim past; actually somewhat more, because most of the sun’s material is located closer to its center, and therefore has a numerically larger potential energy. One-half of the energy set free is...
متن کاملAnisotropic dark energy stars
A model of compact object coupled to inhomogeneous anisotropic dark energy is studied. It is assumed a variable dark energy that suffers a phase transition at a critical density. The anisotropic Λ−Tolman-Oppenheimer-Volkoff equations are integrated to know the structure of these objects. The anisotropy is concentrated on a thin shell where the phase transition takes place, while the rest of the...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1946
ISSN: 0004-6256
DOI: 10.1086/105941