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NASA Astronomical Software Directory Information for ASpec

Title: ASpec-A New Line and Spectrum Analysis Package for IRAF

Authors: Jonathan D. Eisenhamer, Stephen J. Hulbert, Zoltan G. Levay,
and Richard A. Shaw (STScI)

Organization responsible for distribution: STScI

Organization responsible for maintenance: STScI

Software Release Date and Version Number: 1 December 1996/1.0 Beta

Abstract: ASpec is a new spectrum and line analysis package developed at STScI.
ASpec is designed as an add-on package for IRAF and incorporates a variety of
analysis techniques for astronomical spectra. ASpec operates on spectra from
a wide variety of ground-based and space-based instruments. ASpec allows
simultaneous handling of spectra from different wavelength regimes. ASpec
accommodates non-linear dispersion relations. ASpec provides a variety of
functions, individually or in combination, with which to fit spectral features
and the continuum. ASpec permits the masking of known bad data. ASpec provides
a powerful, intuitive graphical user interface implemented using the new IRAF
Object Manager and customized to handle: data input/output (I/O); on-line
"help"; selection of relevant features for analysis; plotting and graphical
interaction; data base management

System/Physical Description: ASpec runs as an add-on package to IRAF and uses
the X11IRAF task, xgterm. Support for X11IRAF is available with versions of
IRAF starting with 2.10.3. The source language for ASpec is the IRAF
programming language, spp. The completely installed ASpec package requires
approximately 6 Mbytes of disk space.

Software Dependency Information: ASpec runs under IRAF and requires XIRAF task,
xgterm, and the TABLES add-on package to IRAF.

Statement of Robustness and Use History: ASpec is currently available as a
Beta version only and as such has seen limited use. Additional testing is
required to verify the robustness of the package.

Keywords: IRAF, line fitting, spectrum analysis

Sources of funding for development of software: This software was prepared by
Space Telescope Science Institute under U.S. Government contract NAS5-31859.
This project was funded under the Astrophysical Data Program (ADP).