Astron. Astrophys. Suppl. Ser.
Volume 132, Number 3, November I 1998
|Page(s)||413 - 416|
|Published online||15 November 1998|
The gain–elevation correction of the IRAM 30–m telescope
IRAM, 300 rue de la Piscine, 38406 St. Martin d'Hères, France
2 IRAM, Nucleo Central, Avda. Divina Pastora 7, 18012 Granada, Spain
Send offprint request to: A. Greve
Accepted: 6 May 1998
The residual surface deformations of an optimized homologous radio reflector produce an elevation dependent gain variation for which astronomical observations must be corrected. For the IRAM 30–m telescope we provide information, and an example, how to correct observations of point–like and extended sources. We find agreement between the gain–elevation dependence predicted from the finite element structural calculations and radiometric measurements on the telescope.
Key words: telescopes
© European Southern Observatory (ESO), 1998