Search Publications

The Orion Nebula: Structure, Dynamics, and Population

O'Dell, C. R.

The physical nature and evolution of the Orion Nebula has begun to be revealed by calibrated emission line images and high resolution spectroscopy. We review the evidence that the nebula is a thin wall of emission on the near side of the Orion Molecular Cloud and that its separation from the dominant ionizing star is about 0.3 pc. The density of t…

Monitoring the Winds of Hot Stars with HST/GHRS

Heap, Sara R.

We present observations obtained with the Goddard High Resolution Spectrograph (GHRS) of three O-type stars:ξ per (O7 III),λ Cep (O6 Iaf) and 10 Lac (O9 V). These observations show evidence of instabilities in the winds of all three stars, although not necessarily those expected from current models of structured winds.