III/92 A Library of Stellar Spectra (Jacoby+ 1984)
A Library of Stellar Spectra
Jacoby G.H., Hunter D.A., Christian C.A.
<Astrophys. J. Suppl. Ser., 56, 257 (1984)>
=1984ApJS...56..257J 1984ApJS...56..257J
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 100 161 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 1150-25000Å (Pickles 1998)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_Name [*] Name corrected from original version
2- 11 A10 --- Name *Star identification (HD, BD, SAO, misc.)
13- 16 A4 --- SpT Adopted spectral type.
17- 19 A3 --- Lum Adopted luminosity class
21- 22 A2 --- Sp1 Spectral type from lit. if different
24- 26 A3 --- Lum1 Luminosity class from literature if different
28- 31 F4.2 mag E(B-V) *Derived color excess E(B-V)
33- 36 F4.2 mag (U-B)s U-B color synthesized from the spectrum.
38- 41 F4.2 mag (B-V)s B-V color synthesized from the spectrum.
43- 47 F5.2 mag (U-B)0 Dereddened color derived from (U-B)s
49- 52 F4.2 --- (B-V)0 Dereddened color derived from (B-V)s
54- 57 F4.2 mag U-B ? U-B color taken from the literature.
59- 62 F4.2 mag B-V ? B-V color taken from the literature.
64- 70 F7.2 0.1nm lambda1 [3510] Wavelength of first pixel
72- 75 F4.2 0.1nm Dlambda [1.40] Wavelength increment per pixel
77- 78 I2 h RAh *Right Ascension J2000 (hours)
80- 81 I2 min RAm *Right Ascension J2000 (minutes)
83- 87 F5.2 s RAs *Right Ascension J2000 (seconds)
90 A1 --- DE- *Declination J2000 (sign)
91- 92 I2 deg DEd *Declination J2000 (degrees)
94- 95 I2 arcmin DEm *Declination J2000 (minutes)
97-100 F4.1 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, n_Name, RAh, RAm, RAs, DE-, DEd, DEm, DEs:
Four stars (# 47, 94, 124, 128) have an asterisk (*) in the first
byte, corresponding to the difficulties to identify them; for more
details, see the "History" section below.
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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 --- Name Star identification from headers.dat
11- 80 7E10.3 cW/m2/nm F(i) *? Flux values F(i) in erg/cm2/s/Å
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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: #47 [TR A 14 (G4 V)], #94 [HD 249240 (G7 III)],
#124 [SIV P 24 (B9 Ib)], #128 [42 LSI (A2 I)]
* 17-Aug-2012 [CDS]
Following private communications with G. Jacoby, 3 of the stars could
be recovered (the old names are in the file "new=old.txt"):
* #94 originally HD 249240, is HD 249420;
* #124 originally LSIV P 24, is LS I +60 87 (not certain)
* #128 originally 42 LSI, is LS I +57 42;
* 12-May-2014 [CDS]
The last unidentified star (TR A 14) was retrieved by B. Skiff [Lowell Obs.]
as star A14 in Trumpler's list of stars in the Coma Berenices cluster
(1938LicOB..18..167T 1938LicOB..18..167T), also BD+25 2502.
Acknowledgement:
Documentation for the original version was written by Wayne H. Warren,
Jr. [NSSDC/WDC-A-R&S] November 1984 (file "doc_ori.txt"). 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 1984ApJS...56..257J)
(End) Julie Anne Watko [SSDOO/ADC], Francois Ochsenbein [CDS] 06-Oct-1998