Spitzer IRS Spectroscopy of High-Mass Precursors of Planetary Nebulae
We present Spitzer IRS observations of a small sample of heavily obscured IRAS sources displaying both the infrared and OH maser emission characteristic of OH/IR stars on the asymptotic giant branch (AGB), but also radio continuum emission typical of ionized planetary nebulae (PNe), the so-called OHPNe. Our observations show that their mid-infrared
García-Hernández, D. A. et al.
Fecha de publicación:
9
2007