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III/92 A Library of Stellar Spectra (Jacoby+ 1984)
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A Library of Stellar Spectra
Jacoby G.H., Hunter D.A., Christian C.A.
<Astrophys. J. Suppl. Ser., 56, 257 (1984)>
=1984ApJS...56..257J
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ADC_Keywords: Spectrophotometry
Description:
The machine-readable version of the library contains digital spectra
of 161 stars of spectral types O through M and luminosity classes I,
III, and V. Most stars are of solar metallicity, although two were
chosen specifically for low metallicity. The data were obtained with
the Intensified Reticon Scanner on the #1 91-cm telescope at Kitt Peak
National Observatory. The scans cover the wavelength range 3510-7427
angstroms, with a resolution of approximately 4.5 angstroms, while the
typical photometric uncertainty of each resolution element is about 1
percent and broadband variations are < 3 percent.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 94 161 Information on each star
fluxes.dat 80 64400 The Library of Stellar Spectra, flux data
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See also:
III/83 : IUE Low-Dispersion Reference Atlas I, Normal Stars (Heck+ 1984)
III/88 : Stellar Spectrophotometric Atlas (Gunn+ 1983)
III/124 : Spectrophotometry of 60 stars (Kiehling, 1987)
III/166 : A New Library of Optical Spectra (Silva+ 1992)
III/196 : Near-IR stellar spectra from 1.428 to 2.5 um (Lancon+ 1996)
VI/50 : Intensity Distribution of Normal Stars (Sviderskiene, 1988)
J/PASP/110/863 : A Stellar Spectral Flux Library 1150-25000{AA} (Pickles 1998)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name *Star identification (HD, BD, SAO, misc.)
11- 14 A4 --- Sp Adopted spectral type.
15- 17 A3 --- Lum Adopted luminosity class
19- 20 A2 --- Sp1 Spectral type from lit. if different
22- 24 A3 --- Lum1 Luminosity class from lit. if different
26- 29 F4.2 mag E(B-V) *Derived color excess E(B-V)
31- 34 F4.2 mag (U-B)s U-B color synthesized from the spectrum.
36- 39 F4.2 mag (B-V)s B-V color synthesized from the spectrum.
41- 45 F5.2 mag (U-B)0 Dereddened color derived from (U-B)s
47- 50 F4.2 --- (B-V)0 Dereddened color derived from (B-V)s
52- 55 F4.2 mag U-B ? U-B color taken from the literature.
57- 60 F4.2 mag B-V ? B-V color taken from the literature.
62- 68 F7.2 0.1nm lambda1 [3510] Wavelength of first pixel
70- 73 F4.2 0.1nm Dlambda [1.40] Wavelength increment per pixel
75- 76 I2 h RAh *?Right Ascension J2000 (hours)
78- 79 I2 min RAm *?Right Ascension J2000 (minutes)
81- 84 F4.1 s RAs *?Right Ascension J2000 (seconds)
86 A1 --- DE- *?Declination J2000 (sign)
87- 88 I2 deg DEd *?Declination J2000 (degrees)
90- 91 I2 arcmin DEm *?Declination J2000 (minutes)
93- 94 I2 arcsec DEs *?Declination J2000 (seconds)
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Note on E(B-V):
Derived color excess, E(B-V), used to to deredden the spectrum.
Note on Name, RAh, RAm, RAs, DE-, DEd, DEm, DEs:
Positions with variable precision derived from SIMBAD.
The following four stars could not be identified,
and have the RA and Dec columns blank:
TR A 14 (G4 V star)
HD 249240 (G7 III star), the HD classifies this star as A2.
The star could be HD 24924 (K0 star, Vmag=9.39, at
03 57 35.5 -01 58 30 (2000)).
LSIV P 24 (B9 I)
42 LSI (A2 I)
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Byte-by-byte Description of file: fluxes.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID Star identification from headers.dat
11- 80 7E10.3 10mW/m2/nm F(i) *? Flux values F(i) in erg/cm2/s/Angstrom
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Note on F(i):
Flux values F(i) in erg/cm2/s/Angstrom at wavelengths:
lambda(i) = lambda1 + (i-1+[7*(L-1)])*Dlambda
where L is the number of the line for the star of interest. There are
400 lines of fluxes for each star. Hence, L is the line number in the
file, modulo 400.
In the final record for each star, the seventh flux on the record
appears blank.
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History:
* 24-May-1993 [CDS]
The original data pertaining to each star were contained in a group
of 352 data records. The first two (header) records contained general
information about the star, such as identification, spectral type, UBV
colors and reddening, intrinsic UBV colors, and wavelength
information. Records 3-352 contained 2799 flux values in groups of
eight fluxes per record. The original file can easily be rebuilt by
splitting each record in 352 80-bytes records; this split is
straightforward on Unix workstations with the "fold" command.
* 23-Aug-1996 Julie Anne Watko [SSDOO/ADC]
The previous version of this catalog contained all data for each star
on a single record. To provide a more useful lrecl, the long records
were folded into 70-byte records using the Unix fold command. J.A.
Watko [ADC] used IDL to insert star identification into the first 10
bytes of each record and to create a separate file of header data.
* 06-Oct-1998 [CDS]
Positions of the stars were added when possible --- four stars could
not be recognized.
Acknowledgement:
Documentation for the original version was written by Wayne H. Warren,
Jr. [NSSDC/WDC-A-R&S] November 1984. This ReadMe file is a revision of
Dr. Warren's original document and an Intro document [CDS] 24-May-1993
to the current CDS standard.
References:
Jacoby G.H., Hunter D.A. and Christian C.A. 1984, A Library of Stellar
Spectra, Astrophys. J. Suppl. Ser. 56, 278. (1984ApJS...56..257J)
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(End) Julie Anne Watko [SSDOO/ADC], Francois Ochsenbein [CDS] 06-Oct-1998