Results 211 to 220 of about 25,277 (239)
Chemical study of intermediate-mass (IM) Class 0 protostars. CO depletion and N2H+ deuteration
, 2010 T. Alonso‐Albi +12 more
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Science, 1998
In recent years, astronomers have begun to discover an increasing number of planets orbiting stars outside our solar system. The characteristics and origins of these planetary bodies are the subject of intense interest and debate. In their Perspective, Russell and Boss discuss the latest results on extrasolar planetary systems presented at a recent ...
Sara S. Russell, Alan P. Boss
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In recent years, astronomers have begun to discover an increasing number of planets orbiting stars outside our solar system. The characteristics and origins of these planetary bodies are the subject of intense interest and debate. In their Perspective, Russell and Boss discuss the latest results on extrasolar planetary systems presented at a recent ...
Sara S. Russell, Alan P. Boss
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Il Nuovo Cimento C, 1993
We present molecular-line observations of young stellar objects (YSOs) suspected to be protostars in the main accretion phase. The aim of this work is to define a list of the best protostellar candidates to be observed in the near future with the ISO spectrometers with the precise scope of searching for the final proof of the infall, theHoly Grail of ...
S. Molinari +4 more
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We present molecular-line observations of young stellar objects (YSOs) suspected to be protostars in the main accretion phase. The aim of this work is to define a list of the best protostellar candidates to be observed in the near future with the ISO spectrometers with the precise scope of searching for the final proof of the infall, theHoly Grail of ...
S. Molinari +4 more
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Physics Today, 1966
Recent observations have placed a very narrow bound on the extent of the celestial x-ray source in the constellation Scorpio (hereinafter designated “Sco X-1”) and provoked a suggestion that it may represent a hitherto unseen class of objects, protostars.
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Recent observations have placed a very narrow bound on the extent of the celestial x-ray source in the constellation Scorpio (hereinafter designated “Sco X-1”) and provoked a suggestion that it may represent a hitherto unseen class of objects, protostars.
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Nuclear Physics B - Proceedings Supplements, 1999
Abstract Very recently, ROSAT and ASCA have been able to detect X-rays from protostars typically 10 times younger than T Tauri stars (i.e., having ages ∼ 10 5 yrs), in spite of their heavy extinction (A V ∼ 30 – 60). The intrinsic luminosities, either quiescent or in the form of flares, are ∼ 10 times higher than T Tauri stars or more. In one
T. Montmerle, N. Grosso
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Abstract Very recently, ROSAT and ASCA have been able to detect X-rays from protostars typically 10 times younger than T Tauri stars (i.e., having ages ∼ 10 5 yrs), in spite of their heavy extinction (A V ∼ 30 – 60). The intrinsic luminosities, either quiescent or in the form of flares, are ∼ 10 times higher than T Tauri stars or more. In one
T. Montmerle, N. Grosso
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Computer Physics Communications, 1976
Abstract A review is given of the physical and numerical problems which arise in the theory of star formation. The evolution of protostars based on numerical calculations is qualitatively described. From the discussion of the basic physics conclusions are drawn regarding the demands on the numerical methods. Some new ideas are outlined concerning the
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Abstract A review is given of the physical and numerical problems which arise in the theory of star formation. The evolution of protostars based on numerical calculations is qualitatively described. From the discussion of the basic physics conclusions are drawn regarding the demands on the numerical methods. Some new ideas are outlined concerning the
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Publications of the Astronomical Society of Australia, 1970
There is a large body of evidence to suggest that the anomalous OH emission sources—particularly those which are classified as class I sources—are associated with protostars. It is also known, from the theories brought forward over the past four years, that maser action can be caused by quite a variety of non-equilibrium situations.
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There is a large body of evidence to suggest that the anomalous OH emission sources—particularly those which are classified as class I sources—are associated with protostars. It is also known, from the theories brought forward over the past four years, that maser action can be caused by quite a variety of non-equilibrium situations.
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Protostars, Disks, and Planets
1979For some centuries, attempts to understand the origin of the solar system were preoccupied with explaining its remarkable dynamical characteristics. It is only during the last few decades that the comparable importance of physicochemical properties as clues to origin has become generally appreciated.
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2012
The Jeans criterion derived in the foregoing section follows from a first-order perturbation theory and gives conditions under which perturbations of an equilibrium stage will grow exponentially. But the linear theory does not give information, for instance, about the fully developed collapse, to say nothing about the final product.
Rudolf Kippenhahn +2 more
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The Jeans criterion derived in the foregoing section follows from a first-order perturbation theory and gives conditions under which perturbations of an equilibrium stage will grow exponentially. But the linear theory does not give information, for instance, about the fully developed collapse, to say nothing about the final product.
Rudolf Kippenhahn +2 more
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