http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/ 2009-03-03T15:31:30-07:00 http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/ http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/lib/images/favicon.ico text/html 2009-03-01T18:13:29-07:00 http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/doku.php?id=talk:chat:aro&rev=1235956409&do=diff text/html 2008-04-22T10:30:31-07:00 tfolkers http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/doku.php?id=remote_observing_at_the_aro&rev=1208885431&do=diff The ARO now offers world-class remote observing at both the 12m and the SMT. Observers can connect to the 12m or SMT computers and * establish a remote data reduction session, * see the on‑line Status screen, * have a computer Talk session with the telescope operator, * have a real‑time automatic display of incoming data, * browse previously recorded data, * see weather information, and * view receiver switched power and total power chart recorder output. text/html 2008-04-22T10:27:56-07:00 tfolkers http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/doku.php?id=planetary_nebulae&rev=1208885276&do=diff One of the areas of major focus at the ARO facilities has been the study of physical and chemical properties of evolved stars. Hrivnak and Bieging (2005), for example, have used the SMT to measure the J=2->1(230 Ghz) and J=4->3(460GHz) transitions of CO towards a sample of 22 protoplanetary nebulae. Modeling of these data has shown that the stellar envelope density is much steeper than r-2, implying a sharp increase in mass loss as the stars evolve on the AGB. The data yield the quantitative tim… text/html 2007-06-28T11:09:16-07:00 erin http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/doku.php?id=a.1_primary_pointing_equations&rev=1183054156&do=diff A.1 Primary Pointing Equations The basic pointing model in use at the 12m is much the same as that described by Stumpff (1972, Kleinheubacher Berichte, 15, 431) and Ulich (1981, International Journal of Infrared & Millimeter Waves, 2, 293). The azimuth and elevation terms used to correct the nominal encoder positions are given by the equations, text/html 2007-06-27T12:38:54-07:00 erin http://hamms.as.arizona.edu/dokuwiki/doku.php/dokuwiki/doku.php?id=6.6.2_hot_cold-load_calibration&rev=1182973134&do=diff 6.6.2 Hot/Cold-Load Calibration A hot/cold load calibration can be used to set the continuum temperature scale, to measure the receiver noise temperature, the noise tube temperature, the sky temperature, and the atmospheric optical depth. At present, we perform hot/cold loads by manually inserting hot and cold loads into the beam and measuring the deflections through the computer, on digital voltmeters, and sometimes on the analog chart recorders.