Revealing the transition from post-AGB stars to planetary nebulae

Details Revealing the transition from post-AGB stars to planetary nebulae Revealing the transition from post-AGB stars to planetary nebulae

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.1993b&link_type=abstract

ATNF proposal C1450, Semester: April, 2009

Computer Science

Galactic, Atca

Scientific paper

In 2005, we used ATCA at 3- & 6-cm to detect the onset of ionizing winds in a biased sub-sample of post-AGB stars selected from an OH maser survey. The evolutionary status of the objects was indicated by 2-colour plots of IRAS and MSX data as well as OH maser profile characteristics. We detected 7/28 sources in radio continuum and found that 2 had non-thermal spectral indices, consistent with wind shock interactions rather than photoionization by an evolving progenitor (Bains et al, 2008, MNRAS submitted). Furthermore, SED modelling of some of the radio-detected sources revealed central star temperatures << 30,000 K, the threshold for significant photoionization. To refine the diagnostic capabilities of the infrared colours and maser characteristics in predicting both the evolutionary phase of these objects and the presence of ionizing winds within them, we now propose to complete the ATCA survey of the remainder of the sample (57 targets) at 3 & 6 cm. This ATCA detection experiment provides an excellent showcase for the unprecedented sensitivity of the CABB.

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