Other
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dln..........4s&link_type=abstract
Daresbury Laboratory: Newsletter on Analysis of Astronomical Spectra, p. 4
Other
Radiative Transfer, Pre-Main Sequence Stars, Asymptotic Giant Branch Stars, Molecular Spectra, Vibration, Photons, Collisions, Dust, Excitation, Newton-Raphson Method, Symmetry, Hydrogen, Continuums, Approximation
Scientific paper
This code solves the radiative transfer equation for pure rotational line emission from an AGB star wind. The basis of the code is the model described by Schonberg (A&A, 195, 198), which uses an approximate Newton-Raphson technique suggested by Schonberg & Hempe (A&A, 163, 151) to solve the radiative transfer in rotational and ro-vibrational transitions for a molecule in a spherical wind. The code can currently handle up to 31 rotational levels in the lowest two vibrational levels of a molecule. The excitation of the molecule is calculated from pure radiative excitation by the central star and by IR photons from dust grains in the wind (for which an approximate radiative transfer solution for the dust continuum is obtained), and from collisions with H2 molecules in the wind. The level populations are then determined, treating fully the radiative transfer through all the rotational and ro-vibrational levels. A separate program is then used to generate the line profiles for individual rotational lines of interest using the above radiative transfer solution, as described by Schonberg. The code as originally obtained from these authors has been considerably modified, and can now be used to model molecules in AGB star winds specifically (although application to other molecular sources, like PMS stars. could be envisaged, provided spherical symmetry is a reasonable approximation). Descriptions of some of the enhancements to the code, and illustrations of the types of source that can be modeled and the type of output that can be generated are given by Justtanont et al. (ApJ, 435, 852; 1996, ApJ 456, 337) ) and by Skinner et al. (In Preparation; reference and preprints will be available soon). Potential users of this code are strongly advised to read the various papers referred to above in order to appreciate some of the complexities of the problem being solved, and to understand the essential physics of the problem.
No associations
LandOfFree
The Hitch-Hiker's Guide to MMLINE: Molecular Rotational Lines in AGB Star Winds does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Hitch-Hiker's Guide to MMLINE: Molecular Rotational Lines in AGB Star Winds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Hitch-Hiker's Guide to MMLINE: Molecular Rotational Lines in AGB Star Winds will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1147278