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Detailed Description of III/77
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Individual files can be fetched (via http) from
here
or via ftp from: ftp://cdsarc.u-strasbg.fr/pub/cats/III/77
The catalogue can be queried from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=III/77
This standardized document follows the rules of the Standard Description for Astronomical Catalogues. For those having to work on this catalogue using FORTRAN programs, this ReadMe file can be transformed into a f77-compliant program which reads the files making up this catalogue, in two versions: either a f77 program loading whole files into arrays, or a f77-program reading each data file line by line.
III/77 Copernicus 0.2-A Resolution Far-UV Stellar Spectra (Snow+ 1977)
================================================================================
A Catalog of 0.2-A Resolution Far-Ultraviolet Stellar Spectra
Measured with Copernicus
Snow Jr. T.P., Jenkins E.B.
<Astrophys. J. Suppl. 33, 269 (1977)>
=1977ApJS...33..269S
================================================================================
ADC_Keywords: Spectrophotometry; Spectra, ultraviolet
Mission_Name: Copernicus
Description:
The catalog is a subset comprising data for 60 O- and B-type stars
observed by the Copernicus satellite. For each star a FITS file was
created of the observed spectrum. Each spectrum has 2250 photometric
data points. The wavelength range is from 1000 to 1450 Angstroems in
0.2-Angstrom steps. The data were acquired with photomultiplier U2,
which had a nominal bandpass of 0.2 Angstrom (A) and scanned the
spectrum with a 0.2 A step length, integrating for 13.6 sec at each
wavelength position.
File Summary:
FileName Lrecl Records Explanations
× ReadMe 80 . This file
× catalog.ori 120 9060 Condensed catalog data
× stars.dat 88 60 Basic data of observed stars
× zet_pup.dat 42 2250 Spectrum of Zeta Pup
× 9_sgr.dat 42 2250 Spectrum of 9 Sgr
× 29_cma.dat 42 2250 Spectrum of 29 CMa
× hd199579.dat 42 2250 Spectrum of HD 199579
× 15_mon.dat 42 2250 Spectrum of 15 Mon
× th1ori_c.dat 42 2250 Spectrum of Theta 1 Ori C
× xi_per.dat 42 2250 Spectrum of Xi Per
× la_ori_a.dat 42 2250 Spectrum of Lambda Ori A
× tau_cma.dat 42 2250 Spectrum of Tau CMa
× iot_ori.dat 42 2250 Spectrum of Iota Ori
× 10_lac.dat 42 2250 Spectrum of 10 Lac
× alp_cam.dat 42 2250 Spectrum of Alpha Cam
× de_ori_a.dat 42 2250 Spectrum of Delta Ori A
× zet_oph.dat 42 2250 Spectrum of Zeta Oph
× mu_col.dat 42 2250 Spectrum of Mu Col
× mu_nor.dat 42 2250 Spectrum of Mu Nor
× ze_ori_a.dat 42 2250 Spectrum of Zeta Ori A
× eps_ori.dat 42 2250 Spectrum of Epsilon Ori
× tau_sco.dat 42 2250 Spectrum of Tau Sco
× kap_ori.dat 42 2250 Spectrum of Kappa Ori
× eps_per.dat 42 2250 Spectrum of Epsilon Per
× del_sco.dat 42 2250 Spectrum of Delta Sco
× th_car.dat 42 2250 Spectrum of Theta Car
× rho_leo.dat 42 2250 Spectrum of Rho Leo
× gam_ara.dat 42 2250 Spectrum of Gamma Ara
× zet_per.dat 42 2250 Spectrum of Zeta Per
× 139_tau.dat 42 2250 Spectrum of 139 Tau
× bet_cma.dat 42 2250 Spectrum of Beta CMa
× be_cen_a.dat 42 2250 Spectrum of Beta Cen A
× sig_sco.dat 42 2250 Spectrum of Sigma Sco
× omi_per.dat 42 2250 Spectrum of Omicron Per
× 40_per.dat 42 2250 Spectrum of 40 Per
× alp_vir.dat 42 2250 Spectrum of Alpha Vir
× 42_ori.dat 42 2250 Spectrum of 42 Ori
× pi_sco.dat 42 2250 Spectrum of Pi Sco
× lam_sco.dat 42 2250 Spectrum of Lambda Sco
× eps_cma.dat 42 2250 Spectrum of Epsilon CMa
× gam_peg.dat 42 2250 Spectrum of Gamma Peg
× ups_sco.dat 42 2250 Spectrum of Upsilon Sco
× zet_cen.dat 42 2250 Spectrum of Zeta Cen
× sig_sgr.dat 42 2250 Spectrum of Sigma Sgr
× alp_pav.dat 42 2250 Spectrum of Alpha Pav
× om_2_cma.dat 42 2250 Spectrum of Omicron2 CMa
× iot_her.dat 42 2250 Spectrum of Iota Her
× eta_uma.dat 42 2250 Spectrum of Eta UMa
× hd21278.dat 42 2250 Spectrum of HD 21278
× eta_cma.dat 42 2250 Spectrum of Eta CMa
× 67_oph.dat 42 2250 Spectrum of 67 Oph
× del_per.dat 42 2250 Spectrum of Delta Per
× zet_dra.dat 42 2250 Spectrum of Zeta Dra
× alp_col.dat 42 2250 Spectrum of Alpha Col
× eta_tau.dat 42 2250 Spectrum of Eta Tau
× phi_eri.dat 42 2250 Spectrum of Phi Eri
× alp_gru.dat 42 2250 Spectrum of Alpha Gru
× alp_leo.dat 42 2250 Spectrum of Alpha Leo
× be_ori_a.dat 42 2250 Spectrum of Beta Ori A
× 20_tau.dat 42 2250 Spectrum of 20 Tau
× bet_lib.dat 42 2250 Spectrum of Beta Lib
× alp_lyr.dat 42 2250 Spectrum of Alpha Lyr
× alp_cma.dat 42 2250 Spectrum of Alpha CMa A
See also:
http://iuewww.gsfc.nasa.gov/copernicus/oao3.html : data in FITS
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 12 A12 --- FileName Name of file (in this directory) with spectrum
14- 17 I4 --- HR Harvard Revised (Bright Star) number (1)
20- 29 A10 --- Name Current designation of the star (1)
32- 37 I6 --- HD Henry Draper (cat. <III/135>) designation (1)
40- 41 I2 h RAh Right Ascension J2000 (hours) (1)
43- 44 I2 min RAm Right Ascension J2000 (minutes) (1)
46- 49 F4.1 s RAs Right Ascension J2000 (seconds) (1)
51 A1 --- DE- Declination J2000 (sign) (1)
52- 53 I2 deg DEd Declination J2000 (degrees) (1)
55- 56 I2 arcmin DEm Declination J2000 (minutes) (1)
58- 59 I2 arcsec DEs Declination J2000 (seconds) (1)
61- 65 F5.2 mag Vmag Visual magnitude (1)
67- 71 F5.2 mag B-V Colour index (1)
74- 88 A15 --- SpType Spectral type (1)
Note (1): These values were extracted from the Bright Star Catalog,
5th Revised Edition by D. Hoffleit and W. Warren H. Jr, 1991,
catalog V/50
Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
2- 7 F6.2 nm wave [100/145] Wavelength in nm
9- 14 I6 0.0714/s S ? average corrected signal counts
per 14 seconds
16- 17 I2 --- o_S [ 0/10]? number of observations per
wavelength point
19- 20 I2 --- ERR Error Flag: 1 = good; 0 = blank data;
-1 = S negative; -2 = OBS = zero;
-3 = OBS overflow OBS > 9, data lost
22- 31 E10.3 --- COUNTS *?=-9.990E+01 uncorrected count rate
33- 42 E10.3 --- e_COUNTS *?=-9.990E+01 noise in observed counts
Note on COUNTS, e_COUNTS:
From these two numbers we can estimate the noise in the spectrum,
i.e., (COUNTS/N_S)**(1/2), where COUNTS ~= 1.5*S + 40 (Bohlin 1975), is
the total observed (namely, uncorrected) count rate. This was done for
the good data points.
Brief description of catalog.ori:
If space is at a premium, the original data file prepared by the ADC
is still available. All the spectra, including the number of
observations, are in this file. The format of the file is a block of
151 records for each object:
Record 1 contains the object identification in the first 16 bytes.
Records 2-151 contain the spectral data, 15 data points per record.
Each data point consists of two numbers and is of the form:
S/Obs == Average Corrected Signal/Number of Observations,
in format (I6,1H/,I1) or blank.
Note that S is the corrected signal in counts per 14s and that Obs is
the number of observations that were averaged together to determine S.
From these two numbers we can estimate the noise in the spectrum,
i.e., (S'/Obs)**(1/2), where S' ~= 1.5*S + 40 (Bohlin 1975), is the
total observed (namely, uncorrected) count rate.
If a data point is blank, it was deleted from the originally published
results because of an obvious flaw attributable to guidance errors or
to overcorrection or undercorrection for particle background. Since
data fields can contain blanks and zeroes (see the data tables and
associated graphical spectra in Snow and Jenkins 1977) which indicate
that they should not be used, the 'number of observations' field must
be checked for zero before using a data point.
Historical Notes:
* A magnetic tape containing the far-ultraviolet spectral data was
received from Dr. Edward B. Jenkins in June 1979. This tape was
formatted as a print tape having the record structure and spacing of
the printed pages in the Snow and Jenkins (1977) paper. Due to
programming complications arising from the original format, which
contains blank lines and data fields for many stars within each
logical record, it was decided to rewrite the tape to a more suitable
format for data analysis and plotting purposes. Thus, the tape was
converted at the Astronomical Data Center to the format contained in
the previous catalog data, catalog.ori, where the data fields and
slash characters remain identical to those used in the published
tables. One more reformatting round was done to bring the data format
in line with other standardized catalogs. This work was started by J.
Lyu and completed by P. Kuin. An error in the number of observations
field, that was allowed only one character during the previous
reformatting, was found. There appears to have been a number of data
points with more than 9 observations. These numbers were lost. For the
reformatted files the number has been set to 10 and an error flag has
been added to identify the record. The data were converted by P. Kuin
into separate files that can be easily converted to the FITS format
using the tofits program.
* 20-May-1998: the file "stars.dat" containing basic data of the
observed stars was added at CDS (F. Ochsenbein)
Acknowledgments:
The original ADC documentation by William T. Sheridan and Wayne H.
Warren Jr. (1981) and the ApJS publication (Snow and Jenkins, 1977)
were used to generate this ReadMe file.
References:
Bohlin, R.C. 1975, ApJ, 200, 402. (1975ApJ...200..402B)
================================================================================
(End) Paul Kuin [Hughes STX/NASA] 07-Aug-1997
