Hot HB stars in ω Cen (Moehler+, 2011)

Details Hot HB stars in ω Cen (Moehler+, 2011) Hot HB stars in ω Cen (Moehler+, 2011)

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ycat..35269136m&link_type=abstract

VizieR On-line Data Catalog: J/A+A/526/A136. Originally published in: 2011A&A...526A.136M

Physics

Clusters: Globular, Stars: Horizontal Branch, Blue Objects, Radial Velocities, Effective Temperatures

Scientific paper

Moderately high resolution spectra of hot HB stars in the globular cluster omega Cen were analysed for radial velocity variations, atmospheric parameters, and abundances using LTE and non-LTE model atmospheres.
The spectroscopic data were obtained in 2005 (4 observations) and in 2006 (5 observations) in Service Mode using the MEDUSA mode of the multi-object fiber spectrograph FLAMES + GIRAFFE on the UT2 Telescope of the VLT. We used the low spectroscopic resolution mode with the spectral range 3964Å-4567Å (LR2, R=6400) and observed spectra for a total of 109 blue hook and canonical blue HB/EHB star candidates (see Table 1) and for 17 sky background positions. Each observation had an exposure time of 2550s to keep the total execution time of the observing block shorter than one hour.
(3 data files).

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