J/MNRAS/489/1697 Galactic disc enrichment with Mo and Ru (Mishenina+, 2019)
Enrichment of the Galactic disc with neutron-capture elements: Mo and Ru.
Mishenina T., Pignatari M., Gorbaneva T., Travaglio C., Cote B.,
Thielemann F.-K., Soubiran C.
<Mon. Not. R. Astron. Soc., 489, 1697-1708 (2019)>
=2019MNRAS.489.1697M 2019MNRAS.489.1697M (SIMBAD/NED BibCode)
ADC_Keywords: Abundances, [Fe/H] ; Abundances ; Effective temperatures ;
Stars, late-type ; Milky Way ; Spectra, optical
Keywords: stars: abundances - stars: late-type - Galaxy: disc -
Galaxy: evolution
Abstract:
We present new observational data for the heavy elements molybdenum
(Mo, Z=42) and ruthenium (Ru, Z=44) in F-, G-, and K-stars belonging
to different substructures of the Milky Way. The range of metallicity
covered is -1.0<[Fe/H]<+0.3. The spectra of Galactic disc stars have a
high resolution of 42000 and 75000 and signal-to-noise ratio better
than 100. Mo and Ru abundances were derived by comparing the observed
and synthetic spectra in the region of Mo I lines at 5506, 5533Å
for 209 stars and Ru I lines at 4080, 4584, 4757Å for 162 stars
using the LTE approach. For all the stars, the Mo and Ru abundance
determinations are obtained for the first time with an average error
of 0.14dex. This is the first extended sample of stellar observations
for Mo and Ru in the Milky Way disc, and together with earlier
observations in halo stars it is pivotal in providing a complete
picture of the evolution of Mo and Ru across cosmic time-scales.
Description:
In this investigation, we used the same spectra, atmospheric
parameters, and analytical techniques as earlier in Mishenina et al.
(2013A&A...552A.128M 2013A&A...552A.128M, Cat. J/A+A/552/A128). The spectra of the target
stars were obtained using the 1.93m telescope at Observatoire de
Haute-Provence (OHP, France) equipped with the Echelle-type
spectrograph ELODIE (Baranne et al. 1996A&AS..119..373B 1996A&AS..119..373B) with the
resolving power of R=42000, the wavelength range from 4400 to 6800Å
and signal-to-noise (S/N) ratio of about 100-300. We also used
additional spectra taken from the OHP spectroscopic archive (Moultaka
et al. 2004PASP..116..693M 2004PASP..116..693M), presenting the SOPHIE spectrograph
(Perruchot et al. 2008SPIE.7014E..0JP) data covering a similar
wavelength range at the resolution of R=75000.
The procedures employed to derive the effective temperatures Teff
surface gravities logg, and microturbulent velocity Vt for our stars
were described in detail in Mishenina & Kovtyukh (2001A&A...370..951M 2001A&A...370..951M)
and Mishenina et al. (2004A&A...418..551M 2004A&A...418..551M, Cat. J/A+A/418/551,
2008A&A...489..923M 2008A&A...489..923M, Cat. J/A+A/489/923).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 68 276 Stellar parameters and abundances of Mo and Ru
tablea2.dat 132 54 Parameters of our target stars and their
comparison with with those reported in
literature
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Region Region (thin/thick disc, Hercules stream,
non classified)
17- 24 A8 --- Name Star name (HD or BD)
26- 29 I4 K Teff Effective temperature
31- 34 F4.2 [cm/s2] logg Surface gravity
36- 40 F5.2 [-] [Fe/H] Iron to hydrogen abundance ratio
42- 44 F3.1 km/s Vt Microturbulent velocity
46 A1 --- l_[Mo/Fe] Limit flag on [Mo/Fe]
48- 52 F5.2 [-] [Mo/Fe] ? Molybdenum to Fe abundance ratio
54- 57 F4.2 [-] e_[Mo/Fe] ? Error on [Mo/Fe]
59- 63 F5.2 [-] [Ru/Fe] ? Ruthenium to Fe abundance ratio
65- 68 F4.2 [-] e_[Ru/Fe] ? Error on [Ru/Fe]
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name HD star name (NNNNNN)
8- 11 I4 K Teffo Effective temperature determined in this paper
13- 16 F4.2 [cm/s2] loggo Surface gravity determined in this paper
18- 22 F5.2 [-] [Fe/H]o Fe to H abundance ratio determined in this
paper
24- 29 F6.1 K Teffl Effective temperature from litterature
31- 35 F5.3 [cm/s2] loggl Surface gravity from litterature
37- 42 F6.3 [-] [Fe/H]l Fe to H abundance ratio from litterature
44- 49 F6.1 K DTeff Difference between Teffo and Teffl
(Teffo-Teffl)
51- 56 F6.3 [cm/s2] Dlogg Difference between loggo and loggl
(loggo-loggl)
58- 63 F6.3 [-] D[Fe/H] Difference between [Fe/H]o and [Fe/H]l
([Fe/H]o-[Fe/H]l)
65-132 A68 --- ref References for Teffl, loggl and [Fe/H]l
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 06-Jan-2023