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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Aims: We aim to compute the binary fraction of "classical" dwarf spheroidalgalaxies (dSphs) that are satellites of the Milky Way (MW). This value canoffer insights into the binary fraction in environments that are less dense andmore metal-poor than our own galaxy. Additionally, knowledge of the binaryfraction in dwarf galaxies is important with respect to avoidingoverestimations of their dark matter content, inferred from stellar kinematics.  Methods: We refined an existing method from the literature, placing anemphasis on providing robust uncertainties on the value of the binary fraction.We applied this modified method to a VLT/FLAMES dataset for Sculptor,specifically acquired for the purpose of velocity monitoring of individualstars, as well as to literature datasets for other six MW "classical" dSphs. Inall cases, the targeted stars were mainly red giant branch stars (RGBs), withexpected masses of around 0.8 M$_{\odot}$. The VLT/FLAMES dataset offers themost precise binary fractions compared to literature datasets, due to its timebaseline of 12 years, along with at least nine repeated observations for eachstar.  Results: We found that the binary fraction of Sculptor is0.55$^{+0.17}_{-0.19}$. We find that it is important to take into account theRoche lobe overflow for constraining the period distribution of binary stars.In contrast to what has recently been proposed in the literature, our analysisindicates that there is no evidence to support varying the properties of thebinary stellar population or their deviations from those established for thesolar neighborhood, based on the sample of MW dSphs analyzed here.

Binary star population of the Sculptor dwarf galaxy