ADC/CDS Standard Document for Catalog:/catalogs/3/3088/
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III/88 Stellar Spectrophotometric Atlas (Gunn+ 1983)
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Stellar Spectrophotometric Atlas
Gunn J.E., Stryker L.L.
<Astrophys. J. Suppl. Ser. 52, 121 (1983)>
=1983ApJS...52..121G
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ADC_Keywords: Spectrophotometry
Description:
The data were obtained with the Oke multichannel scanner on the
5-meter Hale reflector for purposes of synthetizing galaxy spectra,
and the digitized atlas contains normalized spectral energy
distributions, computed colors, scan line and continuum indices for
175 selected stars covering the complete ranges of spectral type and
luminosity class.
History:
As noted below, the ADC archived and documented this catalog in 1984.
The CDS built the "catalog" file by incorporating the error mentioned
as a "Note added in proof" concerning the HD number of star number
115, and by concatenating the 142 consecutive records making up one
spectrum. The undersigned broke these again into four arrays, each
with a number of records for each star.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
head.dat 139 175 Details about each star
misc.dat 214 175 Miscellaneous data for each star
flux.dat 110 8925 Fluxes
error.dat 110 8925 Mean error for each flux
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Byte-by-byte Description of file: head.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- No [1/175]+ Running number
5- 15 A11 --- ID Star name
16- 21 A6 --- Sp Spectral type
23- 26 F4.2 mag AVref Absorption from reference
28- 31 F4.1 arcsec AP Aperture size
34 I1 --- G Code for green filter
36 I1 --- R Code for red filter
38 I1 --- B Code for blue filter
40- 41 I2 --- obj Object code
43- 44 I2 --- day_co Code for day of observation
46- 51 F6.3 mag V Magnitude from scan (1)
54- 59 F6.3 mag AV Visual absorption (1)
61- 66 F6.3 mag U-B U-B color from scan (2)
68- 73 F6.3 mag B-V B-V color from scan (2)
75- 80 F6.3 mag V-R V-R color from scan (2)
82- 87 F6.3 mag R-I R-I color from scan (2)
89- 94 F6.3 --- amass Airmass (3)
95-115 3F7.3 --- plot Internal data used for plotting
117-122 F6.3 rad RArad Right ascension (1950)
124-129 F6.3 rad DErad Declination (1950)
132-139 F8.3 --- cosb Cosecant of galactic latitude
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Note (1):
The magnitudes and colors are derived from the scans. Although they
are given to 0.001 mag. they are accurate to only 0.1 mag.
Note (2):
The colors were derived from the scans convolved with the standard
filter functions
Note (3): Secant of the zenith distance at mid-observation
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Byte-by-byte Description of file: misc.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- No [1/175]+ Running number
5- 14 E10.3 --- tape Internal tape number
15- 24 E10.3 --- atm *777 if atmospheric cycles have
been removed; otherwise, 0 (1)
25- 34 E10.3 --- red *888 if problems with red. (1)
35- 44 E10.3 mag c33-37 Continuum color: 33-37
45- 54 E10.3 mag c37-40 Continuum color: 37-40
55- 64 E10.3 mag c40-46 Continuum color: 40-46
65- 74 E10.3 mag c46-V Continuum color: 46-V
75- 84 E10.3 mag cV-70 Continuum color: V-70
85- 94 E10.3 mag c70-87 Continuum color: 70-80
95-104 E10.3 mag c87-99 Continuum color: 87-99
105-114 E10.3 mag Bal_brk Balmer break index
115-124 E10.3 mag inCN38+ CN38 index
125-134 E10.3 mag in41-42 41-42 index
135-144 E10.3 mag inCaH CaH index
145-154 E10.3 mag inCaK CaK index
155-164 E10.3 mag inTi61+ Ti61+ index
165-174 E10.3 mag inTi71+ Ti71+ index
175-184 E10.3 mag inCa42 Ca42 index
185-194 E10.3 mag inCH43 CH43 index
195-204 E10.3 mag inMg51 Mg51 index
205-214 E10.3 mag inNaD NaD index
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Note (1):
See Gunn and Stryker 1983
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Byte-by-byte Description of file: flux.dat, error.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- No [1/175]+= Running number
6- 10 I5 0.1nm lambda Wavelength for first flux value (1)
12- 20 E9.3 10-20mW/m2/Hz flux1 Flux for the 1st wavelength (2)
22- 30 E9.3 10-20mW/m2/Hz flux2 Flux for the 2nd wavelength (2)
32- 40 E9.3 10-20mW/m2/Hz flux3 Flux for the 3rd wavelength (2)
42- 50 E9.3 10-20mW/m2/Hz flux4 ?Flux for the 4th wavelength (2)
52- 60 E9.3 10-20mW/m2/Hz flux5 ?Flux for the 5th wavelength (2)
62- 70 E9.3 10-20mW/m2/Hz flux6 ?Flux for the 6th wavelength (2)
72- 80 E9.3 10-20mW/m2/Hz flux7 ?Flux for the 7th wavelength (2)
82- 90 E9.3 10-20mW/m2/Hz flux8 ?Flux for the 8th wavelength (2)
92-100 E9.3 10-20mW/m2/Hz flux9 ?Flux for the 9th wavelength (2)
102-110 E9.3 10-20mW/m2/Hz flux10 ?Flux for the 10th wavelength (2)
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Note (1):
In each record, the wavelength of the ith record
= lambda+10(i-1) for lambda less than 5745
= lambda+20(i-1) for lambda greater than 5745
Note for the 25th record for each star (starting with the flux for
5660), the interval changes within the record. Specifically, the
10th flux is for 5760.
Note (2):
The fluxes are apparently divided by 3.67 to normalize them to
a mag=0 star.
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Excerpt from the original ADC document, prepared by Wayne H. Warren Jr:
The tape version of the Stellar Spectrophotometric Atlas was received
from Dr. L. L. Stryker of the Dominion Astrophysical Observatory on
21 October 1982. A brief description of the format was supplied with
the tape, the latter being written with 84-byte logical records having
the digits "0084" in bytes 1-4 of each record. The atlas was
transferred to disk storage and changed to 80-byte logical records by
elimination of the "0084".
A computer program to print and plot spectra from the atlas is
available and can be obtained from Dr. Stryker.
An error in the name identification for star number 115 has been
found and transmitted by Dr. Stryker: HD 113439 should be HD 113493.
The error was not corrected in the first adc version; it was corrected
by the CDS..
The following message was recieved from Dawn Lenz on Mar-22-1995:
This is in response to your request (9 feb) for any addtional
information I could find about the Gunn-Stryker catalog (A3088). Jim
Gunn tells me that "the fluxes are fluxes per unit frequency F_nu,
corrected for the atmosphere AND for galactic extinction. They are
normalized so that the V magnitude of a star with those fluxes is zero."
Acknowledgment by W.H. Warren:
Appreciation is expressed to Dr. Linda L. Stryker for supplying the
original magnetic tape of the atlas, for sending a preprint of the
published paper, and for replying quickly in response to questions
about the format description. Dr. Stryker kindly reviewed the
completed document.
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(End) N. G. Roman [SSDOO/ADC] Mar-10-1999