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J/A+A/392/491       Galactic abundance gradient. III.        (Andrievsky+, 2002)

Using Cepheids to determine the galactic abundance gradient. III. First results for the outer disc Andrievsky S.M., Kovtyukh V.V., Luck R.E., Lepine J.R.D., Maciel W.J., Beletsky Yu.V. <Astron. Astrophys. 392, 491 (2002)> =2002A&A...392..491A
ADC_Keywords: Stars, variable ; Stars, supergiant ; Abundances Keywords: stars: abundances - stars: Cepheids - Galaxy: abundances - Galaxy: evolution Abstract: As a continuation of our previous work, which concerned the radial abundance distribution in the galactic disc over the distances 4-10kpc this paper presents the first results on the metallicity in the outer disc (RG>10kpc). Based on high-resolution spectra obtained for 19 distant Cepheids we sampled galactocentric distances from 10 to 12 kpc. Combined with the results of our previous work on the inner and middle parts of the galactic disc, the present data enable one to study the structure of the radial abundance distribution over a large baseline. In particular, we find indications of a discontinuity in the radial abundance distribution for iron as well as a number of the other elements. The discontinuity is seen at a galactocentric distance RG=10kpc. This finding supports the results reported earlier by Twarog et al. (1997AJ....114.2556T). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file objects.dat 68 19 Program stars: details of the observations and atmosphere parameters objects.tex 74 36 LaTeX version of objects.dat tablea1.dat 43 639 Abundances tablea1.tex 154 269 LaTeX version of tablea1.dat
See also: J/A+A/381/32 : Galactic Cepheid abundances (Andrievsky+, 2002) Byte-by-byte Description of file: objects.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Star Star name 9 A1 --- n_Star [*] Individual note (1) 13- 21 F9.6 d Per Pulsational period 23- 28 F6.3 mag Vmag Visual magnitude 31- 34 I4 s ExpTime Exposure time 37- 49 F13.5 d JD Julian date of observation 51- 55 F5.3 --- phi Phase 57- 60 I4 K Teff Effective temperature 62- 64 F3.1 [cm/s2] logg Logarithm of the gravity (g in cm/s^2) 66- 68 F3.1 km/s Vturb Microturbulent velocity
Note (1): For V504 Mon (classified as s-Cepheid) the fundamentalized period is given (P0=P1/0.71), P(observ)=P1=2.77405.
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Star Star name 12- 17 A6 --- Ion Ion 18 A1 --- l_[M/H] Limit flag on [M/H] 19- 23 F5.2 [Sun] [M/H] ? Relative-to-solar abundance 24 A1 --- u_[M/H] Uncertainty flag on [M/H] 27- 30 F4.2 [Sun] e_[M/H] ? Standard deviation 33- 35 I3 --- Nlines ? Number of lines used in analysis 37 A1 --- l_(El/H) Limit flag on (El/H) 38- 41 F4.2 [---] (El/H) ? Absolute elemental abundance (H=12)
Acknowledgements: Sergei M. Andrievsky References: Andrievsky et al., Paper I 2002A&A...381...32A, J/A+A/381/32 Andrievsky et al., Paper II 2002A&A...384..140A
(End) Patricia Bauer [CDS] 03-Sep-2002
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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