SIMBAD references

2008MNRAS.390..363C - Mon. Not. R. Astron. Soc., 390, 363-370 (2008/October-2)

Radio continuum properties of young planetary nebulae.


Abstract (from CDS):

We have selected a small sample of post-AGB (Asymptotic Giant Branch) stars in transition towards the planetary nebula and present new Very Large Array multi-frequency high-angular resolution radio observations of them. The multi-frequency data are used to create and model the targets' radio continuum spectra, proving that these stars started their evolution as very young planetary nebulae. In the optically thin range, the slopes are compatible with the expected spectral index (-0.1). Two targets (IRAS 18062+2410 and 17423-1755) seem to be optically thick even at high frequency, as observed in a handful of other post-AGB stars in the literature, while a third one (IRAS 20462+3416) shows a possible contribution from cold dust. In IRAS 18062+2410, where we have three observations spanning a period of four years, we detect an increase in its flux density, similar to that observed in CRL 618.

High-angular resolution imaging shows bipolar structures that may be due to circumstellar tori, although a different hypothesis (i.e. jets) could also explain the observations. Further observations and monitoring of these sources will enable us to test the current evolutionary models of planetary nebulae.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): stars: AGB and post-AGB - planetary nebulae: general - radio continuum: stars

CDS comments: Some misprints : IRAS 06556-1623 for IRAS 06556+1623, IRAS 18442-1244 for IRAS 18442-1144, IRAS 20462+3114 for IRAS 20462+3416, IRAS 22023+5349 for IRAS 22023+5249

Simbad objects: 15

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