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

The atmospheric parameters and iron abundance of the Sloan Digital Sky Survey(SDSS) spectrophotometric standard star BD +17 4708 are critically examinedusing up-to-date Kurucz model atmospheres, LTE line formation calculations, andreliable atomic data. We find Teff = 6141+-50 K, log g = 3.87+-0.08, and[Fe/H]=-1.74+-0.09. The line-of-sight interstellar reddening, bolometric flux,limb-darkened angular diameter, stellar mass, and the abundances of Mg, Si, andCa are also obtained. This star is a unique example of a moderately metal-poorstar for which the effective temperature can be accurately constrained from theobserved spectral energy distribution (corrected for reddening). Such analysisleads to a value that is higher than most spectroscopic results previouslyreported in the literature (~5950 K). We find that the ionization balance of Felines is satisfied only if a low Teff (~5950 K) is adopted. With our preferredTeff (6141 K), the mean iron abundance we obtain from the FeII lines is lowerby about 0.15 dex than that from the FeI lines, and therefore, the discrepancybetween the mean iron abundance from FeI and FeII lines cannot be explained byoverionization by UV photons as the main non-LTE effect. We also comment onnon-LTE effects and the importance of inelastic collisions with neutral H atomsin the determination of oxygen abundances in metal-poor stars from the 777 nmOI triplet. (Abridged)Comment: A&A in pres

Fundamental parameters and abundances of metal-poor stars: the SDSS standard BD +17 4708