The chemical compositions of Galactic disc F and G dwarfs
نویسندگان
چکیده
منابع مشابه
The Chemical Compositions of Galactic Disk F and G Dwarfs
Photospheric abundances are presented for 27 elements from carbon to europium in 181 F-G dwarfs from a differential LTE analysis of high-resolution and high signalto-noise spectra. Stellar effective temperatures (Teff) were adopted from an infrared flux method calibration of Strömgren photometry. Stellar surface gravities (g) were calculated from Hipparcos parallaxes and stellar evolutionary tr...
متن کاملChemical composition of 90 F and G disk dwarfs ⋆
High resolution, high S/N spectra have been obtained for a sample of 90 F and G main-sequence disk stars covering the metallicity range −1.0 < [Fe/H] < +0.1, and have been analysed in a parallel way to the work of Edvardsson et al. (1993a) in order to re-inspect their results and to reveal new information on the chemical evolution of the Galactic disk. Compared to Edvardsson et al. the present ...
متن کاملA Survey for Cool White Dwarfs and the age of the Galactic Disc
We describe a new multi–colour proper motion survey for cool white dwarfs (CWDs). The observational database consists of ∼ 300 digitally scanned Schmidt plates in ESO/SERC field 287. The entire survey procedure, from the raw Schmidt plate data to final white dwarf luminosity function (WDLF) is described, with special emphasis on completeness concerns. We obtain a sample of 58 WDs, for which we ...
متن کاملEuropium abundances in F and G disk dwarfs ⋆ ⋆ ⋆
Europium abundances for 74 F and G dwarf stars of the galactic disk have been determined from the 4129.7 Å Eu ii line. The stars were selected from the sample of Edvardsson et al. (1993) and [Eu/Fe] shows a smaller scatter and a slightly weaker trend with [Fe/H] than found by Woolf et al. (1995). The data of the two analyses are homogenized and merged. We also discuss the adopted effective temp...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06305.x