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III/166  A New Library of Optical Spectra (Silva + 1992)

A New Library of Stellar Optical Spectra Silva D.R., Cornell M.E. <Astrophys. J. Suppl. 81, 865 (1992)> =1992ApJS...81..865S
ADC_Keywords: Spectrophotometry ; Spectral types Abstract: Silva and Cornell have compiled a new digital optical stellar spectra library, consisting of intensities at 5A intervals between 3510A and 8930A for 72 different spectral types. These types range from O to M and luminosities range from I to V. Some weak-line and strong-line spectra are also included. The intensities are in ergs/A, normalized to 100 at 5450A. Description: Newly acquired and previously published data have been combined to form a new digital optical library intended primarily for use in empirical population synthesis. Stellar data for a large number of individual stars were acquired during seven observing runs between December 1988 and May 1989. An effort was made to observe, primarily, stars with TZG parameters derived from stellar atmosphere models of high dispersion data. Observations of photometric calibration stars were made during each run, but absolute calibrations were not attempted. Composite spectra from different observations of each star were formed by multiplicatively scaling the individual sub-spectra and averaging. The resultant composite spectra were normalized to 100 at 5450A. Next, the effects of interstellar reddening were removed. Intensities in the spectral regions most affected by telluric absorption were set to zero. Finally, stars with similar TZG parameters and similar overall spectral characteristics were averaged to form the individual spectra in the library, also normalized to 100 at 5450A. Table 1 lists the individual types averaged to form each of the 72 entries in the catalog. The prefixes R and W refer to strong- and weak-line stars, respectively. The list of the observed stars (Table 2 of the paper), and the synthesized UBV colors (Tables 3 and 4 of the paper) were added to the electronic catalog in 1999. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 91 151 *List of stars observed (Table 2) spectra.dat 54 72 *Composite library spectra: Synthesized versus Catalog UBV colours (Tables 3 and 4) sp/* 0 72 The synthetic spectra (1 file per spectrum)
Note on stars.dat, spectra.dat: Two stars quoted in Table 3 of the paper are not in file stars.dat: 242935 (in spectral class O7B0V) g137-69 (in wG8-K0) Three stars in file stars.dat are not used in spectra.dat: 236894 (O8V) 115043 (G1Va) s84091 (K0V)
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 2 I2 --- SpNo [1,72]? Spectrum number 4- 5 I2 h RAh *Right Ascension J2000 (hours) 7- 8 I2 min RAm *Right Ascension J2000 (minutes) 10- 13 F4.1 s RAs *Right Ascension J2000 (seconds) 15 A1 --- DE- *Declination J2000 (sign) 16- 17 I2 deg DEd *Declination J2000 (degrees) 19- 20 I2 arcmin DEm *Declination J2000 (minutes) 22- 23 I2 arcsec DEs *Declination J2000 (seconds) 25- 30 I6 --- HD ? HD designation of the star 33- 39 A7 --- Other *Other designation 42- 50 A9 --- Sp *MK Spectral class 52- 61 A10 --- Obs *[AC-K.] Observations flags 64- 68 I5 K Teff Effective temperature 71 I1 --- L Assigned luminosity class 73- 74 I2 --- M *[-1,1] Assigned metallicity class 76- 80 F5.2 [Sun] [Fe/H] Metallicity index 83- 86 F4.2 mag E(B-V) Colour excess 88- 91 A4 --- Ref *Reference
Note on RAh, RAm, RAs, DE-, DEd, DEm, DEs: position from SIMBAD data-base Note on Other: the designation starts by "s" for SAO (Cat. I/131) designations, or by "g" for Giclas et al. Lowell Proper Motion stars. Note on Sp: Spectral class from original reference. Stars from reference L (1988AJ.....95.1843L) and marked V* are most likely dwarfs, but could be some other luminosity class. Note on Obs: Observation codes are: A = MDM 2.4m 1988Jan, MkIII spectrograph, G4 grism C = MDM 2.4m 1988Feb, MkIII spectrograph, G4 grism D = SOKP 2.3m 1988Mar, B&C spectrograph E = SOKP 2.3m 1988May, B&C spectrograph F = MDM 2.4m 1988Nov, MkIII spectrograph, G2 grism G = MDM 2.4m 1988Nov, MkIII spectrograph, G4 grism H = MDM 2.4m 1989Feb, MkIII spectrograph, G4 grism I = MDM 2.4m 1989Feb, MkIII spectrograph, G2 grism J = MDM 2.4m 1989May, MkIII spectrograph, G4 grism K = MDM 2.4m 1989May, MkIII spectrograph, G2 grism where MDM designates Michigan-Dartmouth-MIT, spectral regime: G2 = 675-925nm, G4 = 436-710nm and SOKP designates Stewart Obs. Kitt Peak, spectral regime 337-470nm Note on M: classes are: 1 = metal-rich, 0.15 < [Fe/H] 0 = metal normal, -0.20 ≤ [Fe/H] ≤ 0.15 -1 = metal poor, [Fe/H] < -0.20 Note on Ref: codes are: FEH = Cayrel de Strobel, 1985A&AS...59..145C FFBG = Faber et al., 1985ApJS...57..711F JHC = Jacoby et al., 1984ApJS...56..257J L = Laird et al., 1988AJ.....95.1843L LB = Luck & Bond, 1985ApJ...292..559L M83 = Keenan, 1983BICDS..24...19K TTCB = Turnshek et al., 1985, "An atlas of Digital Spectra of Cool stars", Tucson: Western Research Company
Byte-by-byte Description of file: spectra.dat
Bytes Format Units Label Explanations
1- 2 I2 --- SpNo [1,72] Spectrum number 5- 13 A9 --- Sp *Spectral class designation 14- 18 F5.2 mag (U-V)s ? Synthesized U-V colour 20- 24 F5.2 mag (B-V)s ? Synthesized B-V colour 26- 30 F5.2 mag (U-V)c ? Catalog U-V colour 32- 36 F5.2 mag (B-V)c ? Catalog B-V colour 38- 42 F5.2 mag (U-V)r ? Residuals U-V colour 44- 48 F5.2 mag (B-V)r ? Residuals B-V colour 50- 54 A5 --- Ref Reference
Note on Sp: this composite spectral class is used to designate the file with spectrophotometric data (in "sp" subdirectory)
Structure of files: sp/*.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 F5.1 nm wavel central wavelength for each pixel 6- 13 F8.3 --- I normalized intensity to 100 at 545.0 nm Verification and Modifications: * May 1992: files received and documented by Nancy G. Roman at NASA/SSDOO/ADC. * 25-Apr-1995, N.P.M. Kuin (NASA/SSDOO/ADC): The data were received by the ADC as one large file. The individual spectra were extracted and put in individual files. A wavelength scale was appended explicitly to each file. * 15-Sep-1999, Francois Ochsenbein, James Marcout (CDS): files spectra.dat and stars.dat were added from tables of paper.
(End) Francois Ochsenbein, James Marcout [CDS] 15-Sep-1999
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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