English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Long-slit medium-resolution spectra of the Galactic globular clusters (GCs)NGC6229 and NGC6779, obtained with the CARELEC spectrograph at the 1.93-mtelescope of the Haute-Provence observatory, have been used to determine theage, helium abundance (Y), and metallicity [Fe/H] as well as the first estimateof the abundances of C, N, O, Mg, Ca, Ti, and Cr for these objects. We solvedthis task by comparing the observed spectra and the integrated syntheticspectra, calculated with the use of the stellar atmosphere models with theparameters preset for the stars from these clusters. The model mass estimates,$T_{\rm eff}$, and log~g were derived by comparing the observed"color-magnitude" diagrams and the theoretical isochrones. The summing-up ofthe synthetic blanketed stellar spectra was conducted according to the Chabriermass function. To test the accuracy of the results, we estimated the chemicalabundances, [Fe/H], $\log~t$, and $Y$ for the NGC5904 and NGC6254 clusters,which, according to the literature, are considered to be the closest analoguesof the two GCs of our study. Using the medium-resolution spectra from thelibrary of Schiavon et al., we obtained for these two clusters a satisfactoryagreement with the reported estimates for all the parameters within the errors.We derived the following cluster parameters. NGC6229: [Fe/H]=-1.65 dex, t=12.6Gyr, Y=0.26, [\alpha/Fe]=0.28 dex; NGC6779: [Fe/H]=-1.9 dex, t=12.6 Gyr,Y=0.23, [\alpha/Fe]=0.08 dex; NGC5904: [Fe/H]=-1.6 dex, t=12.6 Gyr, Y=0.30,[\alpha/Fe]=0.35 dex; NGC6254: [Fe/H]=-1.52 dex, t=11.2 Gyr, Y=0.30[\alpha/Fe]=0.025 dex. The value [\alpha/Fe] denotes the average of the Ca andMg abundances.

Chemical Abundances in the Globular Clusters NGC 6229 and NGC 6779