This documentation is for the "Jacoby" spectral library which
was originally published by Jacoby, Hunter, and Christian in
1984. The reference is Astrophys. J. Suppl. 56, 257.
The original data contained digital spectra for 161 stars of
spectral classes O through M and for the luminosity classes V,
IV, III, II, and I. The original wavelength range was from 3510
A to 7427 A. The resolution was approximatel 4.5 A and the
typical photometric uncertinity for each resolution element was
approximately 1%. The original wavelength increment between
pixel elements was 1.40 A. The original flux values were given
in ergs/cm^2/sec/A and were placed on the flux scale of Hayes
and Latham (1975) Astrophys. J. 197,593. The spectra were
dereddened using the observed colors for the individual stars
and the reddening law of Schild (1977) Astron. J. 82,337.
This data has been extracted from the original database provided
by Astronomical Data Center (ADC) opperated by the National Space
Science Data Center. It is here in a form which can be read by
the CLEA spectrometer simulation package. In particular, the
original data was interpolated at 1 A intervals between 3900 A
and 4500 A and then normalized to 1.0 at the maximum flux value
in this wavelength interval for each spectrum.
The data exists as 161 files containing wavelength, relative
flux data pairs. Each file contains 601 data points. The files
have names like jXXX.sp, where XXX is a number which runs from
001 to 161.
The individual stars are identified in an index file jacoby2.inx.
The following information is contained in the index file:
index number
this is the ordinal number of the star in the library and the
integer part of the file name for the data
name or ID for the star
spectral type
B-V
(synthetic, based on dereddened spectrum)
U-B
(synthetic, based on dereddened spectrum)
record number for the beginning of the data for this star
in the original data file
Contact Dr.Gordon Spear at Sonoma State University, Department of
Physics and Astronomy, Rohnert Park, CA 94928 if you have
additional questions. E-mail: ggs@Charmian.sonoma.edu