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A&A Supplement series, Vol. 122, April I 1997, 1-10

Received 6 February; accepted 26 June, 1996

The ATCA/VLA OH 1612 MHz survey. I. Observations of the galactic bulge Region

M.N. Sevenstertex2html_wrap1401, J.M. Chapmantex2html_wrap1403, H.J. Habingtex2html_wrap1405, N.E.B. Killeentex2html_wrap1407 - M. Lindqvisttex2html_wrap1409

Send offprint request: M.N. Sevenster

tex2html_wrap1411  Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands
tex2html_wrap1413  Anglo Australian Observatory, P.O.Box 296, Epping 2121 NSW, Australia
tex2html_wrap1415  Australia Telescope National Facility, P.O.Box 76, Epping 2121 NSW, Australia


We present observations of the region between tex2html_wrap_inline1383 and tex2html_wrap_inline1385 in the OH 1612.231 MHz line, taken in 1993 October and November with the Australia Telescope Compact Array. gif The region was systematically searched for OH/IR stars and was covered completely with 539 pointing centres separated by 30tex2html_wrap1417. The size of the dataset calls for a special reduction technique that is fast, reliable and minimizes the output (positions and velocities of possible stars only). Having developed such a reduction method we found 307 OH masing objects, 145 of which are new detections. Out of these, 245 have a standard double-peaked spectral profile, 58 a single-peaked profile and 4 have nonstandard or irregular profiles. In this article we analyse the data statistically and give classifications and identifications with known sources where possible. The astrophysical, kinematical, morphological and dynamical properties of subsets of the data will be addressed in future articles. These observations are part of a larger survey, covering tex2html_wrap_inline1389 and tex2html_wrap_inline1391, with the Australia Telescope Compact Array and the Very Large Array.

keywords: techniques: image processing -- surveys -- stars: AGB and post-AGB -- galaxy: center -- radio lines: stars -- galaxy i stellar content

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