Circumnuclear Star-Forming Regions in Barred Galaxies
We present high-resolution Hα velocity fields and rotation curves of the circumnuclear star-forming regions of five barred galaxies. Two of the five objects...
I discuss new observations of circumnuclear regions in barred galaxies, both of their kinematics and their near-infrared (NIR) morphology. New kinematic...
Circumstellar effects on the chemical abundances in AGB stars
In this work we explore how the use of dynamical model atmospheres has an impact on the chemical abundances derived in O-rich (massive) AGB stars. In particular...
Circumstellar effects on the Li and Ca abundances in massive Galactic O-rich AGB stars
We explore the circumstellar effects on the Li and Ca abundances determination in a complete sample of massive Galactic AGB stars. The Li abundance is an...
Circumstellar Envelopes as AGB Mass-Loss Signatures
Low- and intermediate-mass stars (1--8 M&sun;) lose up to 80 % of their initial mass during the Asymptotic Giant Branch (AGB) phase. Heavy mass loss is the...
Circumstellar PAHs in IRAS 16594-4656: a new proto-planetary nebula with a strong 21mum dust feature
Based on ISO SWS+LWS observations, we identify IRAS 16594-4656 as a new member of the rare class of C-rich proto-planetary nebulae with the 21 μm dust feature...