Dust destruction and thermal inhomogeneities in the Orion Nebula. Results of HH 202.
Abstract
We present a long-slit spectroscopic analysis of Herbig-Haro 202 and the surrounding gas of the Orion Nebula using data from the Very Large Telescope. We determined the spatial variation of its physical conditions and chemical abundances. Special attention was paid to the iron (Fe) and oxygen (O) abundances, which show a peak at the brightest part of HH 202, allowing us to estimate that 57% of the dust is the destroyed; we also calculate the amount of depletion of oxygen in dust grains. Finally we show that O abundances determined from collisionally excited lines and recombination lines are irreconcilable at the center of the shock unless thermal inhomogeneities are considered.
- Publication:
-
Cosmic Feast of the Elements
- Pub Date:
- November 2017
- Bibcode:
- 2017cfe..confE..10E
- Keywords:
-
- galaxies;
- nebulae;
- stars;
- abundances;
- models;
- observations