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

We measured the radial velocity of 139 stars in the region of NGC 6253,discussing cluster's membership and binarity in this sample, complementing ouranalysis with photometric, proper motion, and radial velocity data availablefrom previous studies of this cluster, and analyzing three planetary transitingcandidates we found in the field of NGC 6253. Spectra were obtained with theUVES and GIRAFFE spectrographs at the VLT, during three epochs in August 2008.The mean radial velocity of the cluster is -29.11+/-0.85 km/s. Using bothradial velocities and proper motions we found 35 cluster's members, among which12 are likely cluster's close binary systems. One star may have a sub-stellarcompanion, requiring a more intensive follow-up. Our results are in goodagreement with past radial velocity and photometric measurements. Furthermore,using our photometry, astrometry and spectroscopy we identified a new sub-giantbranch eclipsing binary system, member of the cluster. The cluster's closebinary frequency at 29% +/- 9% (34% +/-10% once including long periodbinaries), appears higher than the field binary frequency equal to (22% +/- 5%,though these estimates are still consistent within the uncertainties. Among thethree transiting planetary candidates the brightest one (V=15.26) is worth tobe more intensively investigated with higher percision spectroscopy. Wediscussed the possibility to detect sub-stellar companions (brown dwarfs andplanets) with the radial velocity technique (both with UVES/GIRAFFE and HARPS)around turn-off stars of old open clusters [abridged].

VLT multi-epoch radial velocity survey toward NGC 6253. Analysis of three transiting planetary candidates