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Astron. Astrophys. 346, 441-452 (1999)

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This paper is partly based on observations made with the INT, operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. Observations discussed in this paper were also performed at the Michigan - Dartmouth - MIT (MDM) Observatory and at the Joint Astronomy Center. We gratefully thank the observers at both UKIRT and JCMT for their assistance, particularly Goeran Sandell and Remo Tilanus. EAM acknowledges support by the Netherlands Foundation for Research in Astronomy (ASTRON) with financial aid from the Netherlands Organization for Scientific Research (NWO) under contract number 782-376-011. Support for EAM was also provided by NASA through grant number GO-06459.01-95A from the Space Telescope Science Institute, which is operated by the Association of Universities for research in Astronomy, Inc., under NASA contract NAS5-26555. YJK acknowledges support by the National Science Council of Taiwan under contract number 87-2112-M-003-007. LBFMW acknowledges financial support from the Royal Dutch Academy of Arts and Sciences. The IRAS data were obtained using the IRAS data base server of the Space Research Organisation of the Netherlands (SRON) and the Dutch Expertise Centre for Astronomical Data Processing funded by the Netherlands Organisation for Scientific Research (NWO). We gratefully thank Do Kester and Romke Bontekoe for use of the IRAS-GIPSY system. The IRAS data base server project was also partly funded through the Air Force Office of Scientific Research, grants AFOSR 86-0140 and AFOSR 89-0320. This article uses data from the Digitized Sky Survey, based on photographic data of the National Geographic Society - Palomar Observatory Sky Survey (NGS-POSS) obtained using the Oschin Telescope on Palomar Mountain. The NGS-POSS was funded by a grant from the National Geographic Society to the California Institute of Technology. The plates were processed into the present compressed digital form with their permission. The Digitized Sky Survey was produced at the Space Telescope Science Institute under US Government grant NAG W-2166.

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© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999