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J/MNRAS/420/1590    Abundances of classical Cepheids         (Acharova+, 2012)

Galactic restrictions on iron production by various types of supernovae. Acharova I.A., Mishurov YU.N., Kovtyukh V.V. <Mon. Not. R. Astron. Soc., 420, 1590-1605 (2012)> =2012MNRAS.420.1590A
ADC_Keywords: Stars, variable ; Abundances Keywords: stars: abundances - supernovae: general - stars: variables: Cepheids - Galaxy: abundances - Galaxy: fundamental parameters - galaxies: star formation Abstract: We propose a statistical method for decomposition of contributions to iron production from various sources: Type II supernovae and the subpopulations of Type Ia supernovae, prompt (their progenitors are short-lived stars with ages lower than >100Myr) and tardy (their progenitors are long-lived stars with ages >100Myr). To do that, we develop a theory of oxygen and iron synthesis that takes into account the influence of the spiral arms on the amount of the above elements synthesized by both Type II supernovae and prompt Type Ia supernovae. In the framework of the theory, we processed statistically the new, more precise, observational data on Cepheid abundances, which, as is well known, demonstrate non-trivial radial distributions of oxygen and iron in the Galactic disc with bends in the gradients. Description: In the present paper, we use the most extensive spectroscopic (only) data on oxygen and iron abundances derived for 282 classical Cepheids (872 spectra in total). Some of the data were previously published (Luck et al. 2011, Cat. J/AJ/142/51, and references therein). The spectra of additional Cepheids were obtained using the facilities of the 1.93-m telescope at the Haute-Provence Observatoire (France) equipped with echelle spectrograph ELODIE. Some spectra of Cepheids were obtained with the fibre echelle spectrograph HERMES mounted on the 1.2-m Belgian telescope on La Palma. We also made use of spectra obtained with the Ultraviolet-Visual Echelle Spectrograph (UVES) instrument at the Very Large Telescope (VLT) Unit 2 Kueyen. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 78 282 Abundances, distances, ages and masses for classical Cepheids
See also: J/AJ/142/51 : Galactic Cepheids abundance variations (Luck+, 2011) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Cepheid name 13- 14 I2 --- Nsp Number of spectra 16- 25 F10.7 d Per Period observed 27- 32 F6.3 mag Vmag V magnitude 34- 38 F5.3 mag B-V ?=- B-V colour index 40- 44 F5.3 mag E(B-V) Interstellar redenning 46- 51 F6.3 kpc r Heliocentric distance 53- 57 F5.2 mag VMAG Absolute V magnitude 59- 63 F5.2 [Sun] [O/H] ?=- Oxygen abundance 65- 69 F5.2 [Sun] [Fe/H] Metallicity 71- 73 I3 Myr Age Age 75- 78 F4.1 Msun Mass Mass
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Sep-2012
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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