II/41 420nm CN and G bands in G8-K5 spectra (Griffin+ 1960)
Photoelectric Measurements of the 4200-A CN Band and the G Band in G8-K5 Spectra
Griffin R.E., Redman R.O.
<Mon. Not. R. Astron. Soc., 120, 287 (1960)>
=1960MNRAS.120..287G 1960MNRAS.120..287G
ADC_Keywords: Photometry, CN band; Photometry, G band; Stars, late-type
Description:
Measurements of the λ4200Å CN band are presented for 712
late-type stars. G band data are also included for 212 of these stars.
Mean errors of absolute magnitudes derived from CN intensities are at
least 1.5 mag. Spectral type determined by G band intensity has a mean
deviation of 0.15 class from the MK type for G to K1 stars. The file
photom.dat contains 712 data records in the form of CN ratios and
G-band ratios, with annotations.
The CN ratio is the ratio of the sum of the intensities in the
4097-4149Å and 4230-4283Å wavelength ranges to the intensity in
the 4164-4214Å range. The latter contains the CN absorption band,
and the first two ranges serve as nearby continuum references. The
ratio is a measure of the depth of the absorption in the CN band.
Values greater than 2 indicate absorption in the band.
The G-band ratio is similarly the ratio of the sum of the intensities
in the 4230-4270Å and 4342-4380Å wavelength ranges to the
intensity in the 4285-4315Å range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photom.dat 20 712 Catalog Data (table 1 of paper)
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Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD ? Number of star in the Henry Draper Catalog (1)
9- 11 I3 % CN CN-band ratio (x100)
14- 16 I3 % Gband ? G-band ratio (x100)
19- 20 A2 --- Notes Notes to the entries (2)
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Note (1):
In three instances, the star observed has no HD number and this
column is left blank. The star is identified in the fourth column.
Note (2):
Meaning of the characters in these columns:
A = Dynamical space velocity greater than 80km/s
B = "4150"
C = "Weak-CN"
D = "Strong-line"
E = "Weak-line"
F = BD+42 939
G = Composite spectrum, early-type companion
H = Double, companion star only partly excluded by slit
I = Star name: 49 Ser B
J = Star name: 70 Oph B
In the cases of all double stars not indicated with 'H', where the
angular separation is less than 2 arcsec, the two stars have been
measured together, and where the separation is more than 2 arcsec,
the brighter component alone has been observed.
(End) Julie Anne Watko [SSDOO/ADC], Seth W. Digel [SSDOO] 25-Aug-1997