Grain Formation in Nova Envelopes
نویسندگان
چکیده
منابع مشابه
Grain Formation in the Expanding Envelopes of T Tauri Stars
The possibility of the nucleation in the expanding envelopes of T Tauri stars is investigated by using the nucleation theory by Becker and Doring. The nucleation time scale r,. in .the gas is investigated assuming that only graphite is condensable. The expansion time scale roxo of the gas ejected from a T Tauri star is calculated assuming that the gas flow is steady and spherically symmetric. T...
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Based on a linear and non-linear study of radial pulsations in the envelopes of classical novae (Schenker 1999), I discuss the results both from the point of view of pulsation theory as well as their consequences for current nova models. Starting from initially static envelope structures at various stages during the decline of a nova outburst, strong ‘running wave’ instabilities have been found...
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Introduction: Presolar grains from novae are exceedingly rare. A few SiC and graphite grains have been identified by large 13 C, 15 N, and 30 Si excesses [1, 2]. While some purported nova grains may have actually condensed in a supernova [3], some are undoubtedly nova condensates [4, 5]. Except in rare cases, the material ejected in nova explosions is O-rich, and it remains a puzzle why to date...
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Aromaticmolecules (PAHs or others) are considered to be an abundant component of the Interstellar Matter. However, their formation process remains a problem since a high production rate is required in order to balance the destruction mainly caused by shocks in the Interstellar Medium. We propose that catalytic reactions, based on organometallic chemistry could contribute efficiently to the form...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1977
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.57.1939