Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-21
Astronomy and Astrophysics
Astrophysics
29 pages, 8 figures, to appear in the PASP (July 2001)
Scientific paper
10.1086/322135
The region surrounding the Llano de Chajnantor, a high altitude plateau in the Atacama Desert in northern Chile, has caught the attention of the astronomical community for its potential as an observatory site. Combining high elevation and extremely low atmospheric water content, the Llano has been chosen as the future site of the Atacama Large Millimeter Array. We have initiated a campaign to investigate the astronomical potential of the region in the optical/infrared. Here, we report on an aspect of our campaign aimed at establishing a seeing benchmark to be used as a reference for future activities in the region. After a brief description of the region and its climate, we describe the results of an astronomical seeing campaign, carried out with a Differential Image Motion Monitor that operates at 0.5 micron wavelength. The seeing at the Llano level of 5000 m, measured over 7 nights in May 1998, yielded a median FWHM of 1.1". However, the seeing decreased to 0.7" at a modest 100 m gain above the plateau (Cerro Chico), as measured over 38 nights spread between July 1998 and October 2000. Neither of these represents the best seeing expected in the region; the set of measurements provides a reference base for simultaneous dual runs at Cerro Chico and at other sites of interest in the region, currently underway. A comparison between simultaneous measurements at Cerro Chico and Cerro Paranal indicates that seeing at Cerro Chico is about 12% better than at Paranal. The percentage of optically photometric nights in the Chajnantor region is about 60%, while that of nights useful for astronomical work is near 80%.
Barry Don
Cordes James
Darling Jeremy
Eikenberry Stephen Scott
Giovanelli Riccardo
No associations
LandOfFree
The Optical/Infrared Astronomical Quality of High Atacama Sites. I. Preliminary Results of Optical Seeing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Optical/Infrared Astronomical Quality of High Atacama Sites. I. Preliminary Results of Optical Seeing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Optical/Infrared Astronomical Quality of High Atacama Sites. I. Preliminary Results of Optical Seeing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-239660