Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pnaoj..10....1m&link_type=abstract
Publications of the National Astronomical Observatory of Japan, 10, p.1-14
Astronomy and Astrophysics
Astronomy
Fiber Multi-Object Spectrograph-Open Cluster-Metallicity
Scientific paper
A fiber multi-object spectrograph for the Okayama 188cm telescope (OFMS) has been developed. We found two problems at the observation in 1993. The first was that the spectra were low quality without sufficient photon counts due to smaller efficiency than expected. The second was the complicated procedure in operating the OFMS. We have solved these problems with the development started in 1993. Currently, the OFMS is capable of observing 30 celestial objects simultaneously in a field of view of 1 degree. The resolution of the spectrograph is λ/Δλ=100-150. It is possible to observe spectra of S/N=100 for a mv=10 star at a 1.25 minutes exposure. In April and May 1999, we observed four open clusters and determined the metallicity [Fe/H] for each. We recorded four metallicities as; +0.15 dex for NGC6709, +0.09 dex for IC4665, -0.36 dex for NGC6866, and +0.07dex for NGC6633.
Itoh Nobunari
Karoji Hiroshi
Mito Hiroyuki
Nakada Yoshikazu
Norimoto Yuji
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