The Chromospheric and Transition Region Emiss Region Emission Lines of the Herbig Foe Stars BN ORI and N
Abstract
We propose to obtain long (10 and 12 hours respectively) LWP high dispersion spectra of the pre-main-sequence Herbig FOe stars BN Ori and NGC 2264 Walker 158. BN Ori is a 2.5 M(sun) star with an age of ~1.5x10^6 K and strong chromospheric and transition region emission lines. W158 is a 2.5 Me star with an age of about 1.2x10^6 years. These spectra in conjunction with SWP-LO spectra obtained in the same shifts will be used to investigate the outer atmospheric structure of BN Ori and W158, leading to models of their chromospheres, transition regions and winds. By comparison of these stars with other high mass pre-main-sequence stars we shall investigate how the outer atmospheric structure of such stars evolves as the stars move towards the main sequence and how this structure depends on stellar mass.
- Publication:
-
IUE Proposal
- Pub Date:
- 1986
- Bibcode:
- 1986iue..prop.2486L