Physics – Optics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..35010563e&link_type=abstract
VizieR On-line Data Catalog: J/A+A/501/563. Originally published in: 2009A&A...501..563E
Physics
Optics
Clusters: Open, Photometry: Infrared, Stars: Masses
Scientific paper
The NAOS-CONICA data (ESO Program ID 073.D-0815) were obtained under clear weather conditions with subarcsecond seeing. The detector was an Aladdin 1024x1024 pixel InSb array and the camera had a plate scale of 27.15[mas/pix], giving us a 27x27arcsec2^ field of view of the Arches cluster. Total integration times were 1000, 400 and 720[s] in J, H, and Ks respectively, with the telescope moving alternatively to sky positions for a proper background subtraction.
To optimize the Adaptive Optics (AO) performance we used the N90C10 dichroic, i.e. 90% of the light was directed to the infrared wavefront sensor. The Strehl ratio of our observations exceeded 27% in Ks, and reached more modest values of 5% in J, and 11% in the H band.
Tables 2 and 3 present the DAOPHOT photometry of 427 HKS and 126 JHKS stars in the innermost 10 arcseconds of the Arches cluster. Table 3 is considerably shorter due to the increasing extinction towards bluer wavelengths. Table 5 presents the catalog with all the observed data and physical parameters derived from the Bayesian method and using the Color-magnitude stereogram.
(3 data files).
Espinoza Pablo
Melnick Jorge
Selman Fernando J.
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