Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-03
Astronomy and Astrophysics
Astrophysics
2 pages, contributed paper, IAU Symp. 234, Planetary Nebulae in Our Galaxy and Beyond
Scientific paper
10.1017/S1743921306003632
We present ELSA, a new modular software package, written in C, to analyze and manage spectroscopic data from emission-line objects. In addition to calculating plasma diagnostics and abundances from nebular emission lines, the software provides a number of convenient features including the ability to ingest logs produced by IRAF's splot task, to semi-automatically merge spectra in different wavelength ranges, and to automatically generate various data tables in machine-readable or LaTeX format. ELSA features a highly sophisticated interstellar reddening correction scheme that takes into account temperature and density effects as well as He II contamination of the hydrogen Balmer lines. Abundance calculations are performed using a 5-level atom approximation with recent atomic data, based on R. Henry's ABUN program. Improvements planned in the near future include use of a three-region ionization model, similar to IRAF's nebular package, error propagation, and the addition of ultraviolet and infrared line analysis capability. Detailed documentation for all aspects of ELSA are available at http://www.williams.edu/Astronomy/research/PN .
Henry Richard B. C.
Johnson Michael D.
Kwitter Karen B.
Levitt J. S.
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