The kinetic temperature of Barnard 68
نویسندگان
چکیده
منابع مشابه
The Inevitable Future of the Starless Core Barnard 68
Dense, small molecular cloud cores have been identified as the direct progenitors of stars. One of the best studied examples is Barnard 68 which is considered a prototype stable, spherical gas core, confined by a diffuse high-pressure environment. Observations of its radial density structure however indicate that Barnard 68 should be gravitationally unstable and collapsing which appears to be i...
متن کاملOscillations in the stable starless core Barnard 68
New molecular line observations of the Bok globule Barnard 68 in HCO + irrefutably confirm the complex pattern of red and blue asymmetric line profiles seen across the face of the cloud in previous observations of CS. The new observations thus strengthen the previous interpretation that Barnard 68 is undergoing peculiar oscillations. Furthermore, the physical chemistry of B68 indicates that the...
متن کاملDust emissivity in the Submm / Mm SCUBA and SIMBA observations of Barnard 68
We have observed the dark cloud Barnard 68 with SCUBA at 850 µm and with SIMBA at 1.2 mm. The submillimetre and millimetre dust emission correlate well with the extinction map of Alves, Lada, & Lada (2001). The A V /850 µm correlation is clearly not linear and suggests lower temperatures for the dust in the inner core of the cloud. Assuming a model for the temperature gradient, we derive the cl...
متن کاملThe Ionization Fraction of Barnard 68: Implications for Star and Planet Formation
We present a detailed study of the ionization fraction of the Barnard 68 pre-stellar core, using millimeter HCO and DCO lines observations. These observations are compared to the predictions of a radiative transfer model coupled to a chemical network that includes depletion on grains and gas phase deuterium fractionation. Together with previous observations and modelling of CO and isotopologues...
متن کاملUsing Chemistry to Unveil the Kinematics of Starless Cores : Complex Radial Motions in Barnard 68
We present observations of CO, CO, HCO, HCO, DCO and N2H + line emission towards the Barnard 68 starless core. The line profiles are interpreted using a chemical network coupled with a radiative transfer code in order to reconstruct the radial velocity profile of the core. Our observations and modeling indicate the presence of complex radial motions, with the inward motions in the outer layers ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021419