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J/AJ/132/902        Abundances of 54 Cepheids                   (Luck+, 2006)

The distribution of the elements in the galactic disk. Luck R.E., Kovtyukh V.V., Andrievsky S.M. <Astron. J., 132, 902-918 (2006)> =2006AJ....132..902L
ADC_Keywords: Stars, variable ; Abundances Keywords: Cepheids - Galaxy: abundances - Galaxy: evolution - stars: abundances Abstract: This paper reports on the spectroscopic investigation of 54 Cepheids, deriving parameters and abundances. These Cepheids extend previous samples by about 35% in number and increase the amount of the Galactic disk coverage, especially in the direction of l∼120°. We find that there exists in the Galactic disk at that longitude and at a solar distance of about 3-4kpc a region that has enhanced abundances, <[Fe/H]≳+0.2, with respect to the local region. A simple linear fit to all Cepheid data now extant yields a gradient d[Fe/H]/dR=-0.068±0.003dex/kpc. After consideration of the spatial abundance inhomogeneities in the sample, we conclude that the best current estimate of the overall gradient is d[Fe/H]/dR=-0.06dex/kpc. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 57 56 Summary of stars studied (from Simbad) table6.dat 31 1396 Detailed [x/H] Data for Program Cepheids
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Simbad name 12- 13 I2 h RAh Simbad Hour of Right Ascension (J2000.0) 15- 16 I2 min RAm Simbad Minute of Right Ascension (J2000.0) 18- 21 F4.1 s RAs Simbad Second of Right Ascension (J2000.0) 23 A1 --- DE- Simbad Sign of the Declination (J2000.0) 24- 25 I2 deg DEd Simbad Degree of Declination (J2000.0) 27- 28 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0) 30- 31 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0) 35- 39 F5.2 mag Bmag Simbad B band magnitude 41- 45 F5.2 mag Vmag Simbad V band magnitude 47- 57 A11 --- SpType Simbad MK spectral type
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Source identification 12- 16 A5 --- Ion Ion name 18- 22 F5.2 [-] X/H ? Log of the mean Ion/H number abundance 24- 27 F4.2 [-] e_X/H ? Standard deviation in X/H 29- 31 I3 --- o_X/H ? Number of lines used to derived X/H
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2008
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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