Computer Science
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2543b&link_type=abstract
ATNF proposal C1450, Semester: October, 2009
Computer Science
Late Stages Of Stellar Evolution (Excluding Pulsars And Supernovae), Atca
Scientific paper
In 2005, we began a program to use the Compact Array at 3- & 6-cm to search for the onset of ionizing winds in a sample of 85 post-AGB stars selected from an OH maser survey. The evolutionary status of the objects is indicated by their far infrared and OH maser characteristics. We detected 7/28 sources in radio continuum and found that three had non-thermal spectral indices, consistent with wind shock interactions rather than photoionization by an evolving progenitor. SED modelling of some of the radio-detected sources revealed central star temperatures well below 30,000 K, the threshold for significant photoionization. To improve our understanding of the evolutionary phase of these objects and the presence of ionizing winds within them, we wish to complete the ATCA survey for the sample at 3 & 6 cm using CABB. A further 24 sources were observed with CABB on 8-11 June 2009 and the first CABB images and results have been obtained. We now request 36 hours to complete the survey.
Bains Indra
Chapman Jessica M.
Cohen Martin
Saikia Dhruba
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