Dynamo in protostars
نویسندگان
چکیده
منابع مشابه
Non-steady Accretion in Protostars
Observations indicate that mass accretion rates onto low-mass protostars are generally lower than the rates of infall to their disks; this suggests that much of the protostellar mass must be accreted during rare, short outbursts of rapid accretion. We explore when protostellar disk accretion is likely to be highly variable. While constant α disks can in principle adjust their accretion rates to...
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The evolution of collapsing metal free protostellar clouds is investigated for various masses and initial conditions. We perform hydrodynamical calculations for spherically symmetric clouds taking account of radiative transfer of the molecular hydrogen lines and the continuum, as well as of chemistry of the molecular hydrogen. The collapse is found to proceed almost self-similarly like Larson-P...
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In an effort to shed more light on the formation process of binary stars, we have started a program to study multiplicity among nearby low-and intermediate-mass protostars using the OVRO Millimeter Array. Here, we describe the project and present the first results on the protostellar core in the Bok globule CB 230 (L 1177). At 10 ′′ resolution , the molecular core is resolved into two component...
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Methanol lines observations of a sample of low mass Class 0 protostars are presented. Using a 1D radiative transfer model, I show that several protostars have large abundance jumps in the inner hot and dense region of envelopes, probably because of thermal grain mantle evaporation. These abundances are compared with a grain surface chemistry model.
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ژورنال
عنوان ژورنال: Pramana
سال: 2013
ISSN: 0304-4289,0973-7111
DOI: 10.1007/s12043-013-0628-y