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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 78 282 Abundances, distances, ages and masses for
classical Cepheids
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See also:
J/AJ/142/51 : Galactic Cepheids abundance variations (Luck+, 2011)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Sep-2012