Proposal Identification No.: A2195 Date Received: 2006-Feb-01 13:15:25 Technical Page Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 30 Hours A Search for OH/IR stars in M33 Multi-epoch Spitzer observations of the whole of M33 allow us to select for the brightest variable sources at 3.5 microns with a variabilty amplitude appropriate for a luminous OH/IR star. ...

... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...