III/83 IUE Low-Dispersion Reference Atlas I, Normal Stars (Heck+ 1984)
IUE Low-Dispersion Spectra Reference Atlas. I. Normal Stars
Heck A., Egret D., Jaschek M., Jaschek C.
<Astron. Astrophys. Suppl. Ser. 57, 213 (1984)>
=1984A&AS...57..213H 1984A&AS...57..213H
ADC_Keywords: Spectrophotometry; Spectra, ultraviolet
Mission_Name: IUE
Description:
The atlas contains the fluxes (2 angstroms/step) of 229 low-dispersion
stellar spectra collected by the International Ultraviolet Explorer (IUE)
satellite, compiled for the purpose of establishing reference spectral
sequences in the ultraviolet range. The sequences have been constructed
and the standard stars selected directly from the ultraviolet material,
staying as far as possible within the general MK frame. The catalog is
essentially composed of stars exhibiting normal behaviour in the
ultraviolet. A few peculiar objects have, however, been included as an
illustration of typical abnormalities. This work clearly pointed out the
dangers of extrapolating a spectral classification based on a given
wavelength range to another one, and, in particular, of using the MK
spectral type alone outside its definition range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 80 46945 Calibrated fluxes for each source
sources.dat 44 229 List of sources
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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2- 13 A12 --- ID *Identification of the star (preferably HD)
14- 20 I7 10-16W/m2/nm Fmax *Maximum flux on plot
22- 24 I3 --- Num Record number for the star
26- 29 I4 0.1nm Lambda Wavelength for first flux value in record
31- 40 E10.4 10mW/m2/nm Flux1 *Calibrated absolute fluxes
(erg s-1 cm-2 A-1)
41- 50 E10.4 10mW/m2/nm Flux2 Flux for (Λ + 2A)
51- 60 E10.4 10mW/m2/nm Flux3 Flux for (Λ + 4A)
61- 70 E10.4 10mW/m2/nm Flux4 Flux for (Λ + 6A)
71- 80 E10.4 10mW/m2/nm Flux5 Flux for (Λ + 8A)
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Note on ID:
Each star occupies 205 records of the catalog. ID is repeated. For a list
of the sources in order of appearance in this file, please see
sources.dat.
Note on Fmax:
Value used as maximum on the y-axis when plotting the spectrum for the
atlas. Repeated on each line for same star.
(unit : 10-14 erg cm-2 A-1 s-1)
Note on Flux1:
Each star has fluxes given for wavelengths 1153A to 3201A stepped by 2A.
Five fluxes are given per record. The 205 records for each star are
labeled in the Num field.
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Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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2- 3 I2 h RAh Right Ascension J2000 (hours)
5- 6 I2 min RAm Right Ascension J2000 (minutes)
8- 11 F4.1 s RAs Right Ascension J2000 (seconds)
13 A1 --- DE- Declination J2000 (sign)
14- 15 I2 deg DEd Declination J2000 (degrees)
17- 18 I2 arcmin DEm Declination J2000 (minutes)
20- 21 I2 arcsec DEs Declination J2000 (seconds)
25- 36 A12 --- ID Identification of the star (preferably HD)
38- 44 I7 10-16W/m2/nm Fmax Maximum flux on atlas plot of spectrum
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Remarks and Modifications:
Francois Ochsenbein [CDS] 03-Dec-1993
The original file has been transformed to allow easier computer reading:
the redundant 1025 wavelength values (1153 to 3201 stepped by 2) were removed,
floating-point numbers were normalized with the addition of the "E" between
the mantissa and the exponent.
Julie Anne Watko [ADC] 02-JAN-1997
The data file had been formatted with one line per star. The old 10270 byte
records were difficult to read on some computers. Fluxes were reformatted
to accommodate an 80 byte logical record length. Running numbers and
wavelengths were added. sources.dat was created, and the Intro document
from CDS was updated.
The J2000-position of stars was added at CDS (F.O., 08-Oct-1997)
(End) Julie Anne Watko [SSDOO/ADC] 02-Jan-1997