Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-30T07:32:07.653Z Has data issue: false hasContentIssue false

Synthesis of Classification Dispersion Spectra from Stellar Atmospheres Theory and from High Dispersion Spectra

Published online by Cambridge University Press:  14 August 2015

A. W. Irwin
Affiliation:
David Dunlap Observatory, University of Toronto
C. T. Bolton
Affiliation:
David Dunlap Observatory, University of Toronto
R. F. Garrison
Affiliation:
David Dunlap Observatory, University of Toronto

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The ATLAS programme has been corrected and modified for use at low effective temperatures. A grid of unblanketed model atmospheres has been generated for the region G5-K5, V-II. A spectrum synthesis programme has been written for the calculation of flux vs wavelength for selected regions of the spectrum. Temperature distributions from the grid of continuum models and from published blanketed models will be used along with published oscillator strengths as input data for the spectral synthesis programme.

Spectrograms of MK standards have been taken at 12 Å mm−1 and 120 Å mm−1. The University of Toronto PDS microdensitometer system has been programmed to allow comparison between the synthesized spectra and the observed spectra to determine the effects of effective temperature, surface gravity, microturbulence, and abundance on classification criteria.

Type
Part I/Influence of Abundances Upon Stellar Atmosphere Calculations
Copyright
Copyright © Reidel 1976