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II/179     Southern Spectrophotometric Standards. I + II    (Hamuy+ 1992,94)

Southern Spectrophotometric Standards. I + II Hamuy M., Walker A.R., Suntzeff N.B., Gigoux P., Heathcote S.R., Phillips M.M. <Publ. Astron. Soc. Pacific 104, 533 (1992)> <Publ. Astron. Soc. Pacific 106, 566 (1994)> =1992PASP..104..533H =1994PASP..106..566H
ADC_Keywords: Spectrophotometry; Stars, standard Description: M. Hamuy, et al. have compiled their observations of secondary and tertiary spectrophotometric standard stars for the southern hemisphere in the wavelength range 3300-7550 Angstroms. The observations were made using the RC spectrographs and CCD cameras on the 1.5m and 4m telescopes at CTIO. The machine-readable files contain monochromatic magnitudes vs. wavelength for 29 stars in ASCII and 31 stars in FITS format. Introduction: The author's observations of secondary and tertiary southern spectrophotometric standard stars have been used to generate computer-readable files containing monochromatic magnitudes vs. wavelength for the range 3300-7550 Angstroms. The authors modified the monochromatic fluxes of the secondary standards according to the calibration of Vega published in 1985 by D. S. Hayes, and adjusted the zero point of their energy distributions by matching their V(synthetic) magnitudes to the observed magnitudes. They have used these adjusted secondary standards to calculate new fluxes for the tertiary standards of Stone and Baldwin (1983MNRAS.204..347S). The spectrophotometric data are reported in the "sp" subdirectory, which consist of 29 files of blue magnitudes vs. wavelength and 30 files of red magnitudes vs. wavelength for different standard stars; 30 additional files contain magnitude vs. wavelength for the entire wavelength range. There are an additional two stars, HR 1903 and HR 2421, for which the data is only in FITS format. Information on the contents of the FITS files is contained in the FITS headers of those files. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 96 32 List of stars contained in this catalog (from table1 and table7 of paper I) sp/* 15 89 Individual spectra
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Star name 15- 16 I2 h RAh Right Ascension J2000 (hours) 18- 19 I2 min RAm Right Ascension J2000 (minutes) 21- 24 F4.1 s RAs Right Ascension J2000 (seconds) 26 A1 --- DE- Declination J2000 (sign) 27- 28 I2 deg DEd Declination J2000 (degrees) 30- 31 I2 arcmin DEm Declination J2000 (minutes) 33- 34 I2 arcsec DEs Declination J2000 (seconds) 35 A1 --- n_Name [*] Additional star, not listed in paper (position from the SIMBAD data-base) 37- 41 F5.2 mag B-V ? B-V color index 43- 47 F5.2 mag Vmag ? V magnitude 49- 56 A8 --- SpType Spectral class 59- 70 A12 --- File1 Filename in "sp" subdirectory of spectrum 72- 83 A12 --- File2 Filename in "sp" subdirectory of blue part 85- 96 A12 --- File3 Filename in "sp" subdirectory of red part
Byte-by-byte Description of file: sp/*
Bytes Format Units Label Explanations
1- 5 I5 0.1nm lambda Central wavelength 7- 12 F6.3 mag mag Monochromatic magnitude (see source reference) 14- 15 I2 0.1nm dlam Bandpass bandwidth (in Å)
FITS files: The format of the two FITS files which are included, for HR 1903 and HR 2421, is apparent from the headers --- note that the flux is not expressed in monochromatic magnitudes in these files. Remarks: The computer-readable version of Southern Spectrophotometric Standards. I corresponds to the contents of tables 13 and 14 in the source reference (Hamuy et al. 1992). The HR stars are secondary standards. The data provided are monochromatic magnitudes for the ten secondary standards at steps of 16 Angstroms, which corresponds to the resolution of the authors' 1.5m spectra. The magnitudes are averages of all the observations gathered for these stars. The published version of this data contains error estimates and bandpasses flagged for the presence of telluric features. This information is not part of the computer-readable version. The remaining files contain monochromatic magnitudes for the tertiary standard stars calculated through 50 A bandpasses. As with the secondary standard files, errors and telluric feature flags which appear in the source reference are not part of the computer-readable files. For this reason, researchers are cautioned to review the source reference carefully before using these data. The only changes made to the files as received were right justify the first column and align decimals in the second one. The FITS files, which were also received, have been omitted if the ASCII file is present. Acknowledgments: The staff of the ADC gratefully acknowledges the support of Dr. Mario Hamuy in making the data files available for distribution. The fits files have been included only for the records for which no ASCII data are available. The first work on this catalog at the ADC was by James. E. Gass who also wrote the first version of this document. History: * May 1995: Original version with spectrophotometry * July 1998: the list of stars (file stars.dat) was added at CDS, using the SIMBAD data-base. * 12-Apr-2010: Reformatted the table (to enable plotting of spectra) References: Hayes, D. S. 1985, in Calibration of Fundamental Stellar Quantities, ed. D. S. Hayes, L. E. Pasinetti, and A. G. Davis Philip (Dordrecht, Reidel), p. 225 Stone, R. P. S. 1977, =1977ApJ...218..767S Stone, R. P. S., and Baldwin, J. A. 1983, =1983MNRAS.204..347S
(End) Nancy G. Roman [NASA/ADC/SSDOO] 31-May-1995
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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