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in creator/contributor: "CAU"

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An emulator for the W. M. Keck 10m telescope

The W. M. Keck Observatory Ten Meter Telescope has a Segment Alignment Control System (ACS) to achieve the necessary optical quality over the primary mirror. The primary mirror is a hyperboloid made with a mosaic of 36 segments. The attachment of primary mirror to the mirror cell is made through 108 actuators of adjustable length. The measurement of the relative position of the segments is carried out by 168 capacitive displacement sensors which provide input to the control system. The piston d… more

Date: July 1, 1989

Creator: Fuertes, J. M. (Universidad Politecnica de Cataluna, Barcelona (Spain). Dept. of Automatic Control and Computer Engineering); Jared, R. C. & Llacer, J. (Lawrence Berkeley Lab., CA (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Search for UHE emission from 4U0115+63

We report here the preliminary results of our observations of the sporadic x-ray binary system 4U0115 + 63. The CYGNUS air shower array has been collecting data since April 1986. No significant excess is seen from the direction of this source, nor any correlation with its 24-day orbital period. A 90% confidence-level upper limit on the flux from 4U0115 + 63 is 2.8 {times} 10{sup {minus}13} cm{sup {minus}2} s{sup {minus}1} above 50 TeV. This flux limit is considerably lower than those reported b… more

Date: January 1, 1990

Creator: Alexandreas, D. E.; Allen, R. C.; Biller, S. D.; Dion, G. M.; Lu, X.-Q.; Vishwanath, P. R. et al.