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III/166 A New Library of Optical Spectra (Silva + 1992)
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Beginning of ReadMe :III/166 A New Library of Optical Spectra (Silva + 1992)
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A New Library of Stellar Optical Spectra
Silva D.R., Cornell M.E.
<Astrophys. J. Suppl. 81, 865 (1992)>
=1992ApJS...81..865S
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ADC_Keywords: Spectrophotometry ; Spectral types
Abstract:
Silva and Cornell have compiled a new digital optical stellar spectra
library, consisting of intensities at 5A intervals between 3510A and
8930A for 72 different spectral types. These types range from O to M
and luminosities range from I to V. Some weak-line and strong-line
spectra are also included. The intensities are in ergs/A, normalized
to 100 at 5450A.
Description:
Newly acquired and previously published data have been combined to
form a new digital optical library intended primarily for use in
empirical population synthesis. Stellar data for a large number of
individual stars were acquired during seven observing runs between
December 1988 and May 1989. An effort was made to observe, primarily,
stars with TZG parameters derived from stellar atmosphere models of
high dispersion data. Observations of photometric calibration stars
were made during each run, but absolute calibrations were not
attempted.
Composite spectra from different observations of each star were formed
by multiplicatively scaling the individual sub-spectra and averaging.
The resultant composite spectra were normalized to 100 at 5450A. Next,
the effects of interstellar reddening were removed. Intensities in the
spectral regions most affected by telluric absorption were set to
zero. Finally, stars with similar TZG parameters and similar overall
spectral characteristics were averaged to form the individual spectra
in the library, also normalized to 100 at 5450A. Table 1 lists the
individual types averaged to form each of the 72 entries in the
catalog. The prefixes R and W refer to strong- and weak-line stars,
respectively.
The list of the observed stars (Table 2 of the paper), and the
synthesized UBV colors (Tables 3 and 4 of the paper) were added to the
electronic catalog in 1999.