# Spatially Resolved Hubble Space Telescope Spectra of the Chromosphere of α Orionis

@article{Uitenbroek1998SpatiallyRH,
title={Spatially Resolved Hubble Space Telescope Spectra of the Chromosphere of $\alpha$ Orionis},
author={H. Uitenbroek and A. Dupree and R. Gilliland},
journal={The Astronomical Journal},
year={1998},
volume={116},
pages={2501-2512}
}
• Published 1998
• Physics
• The Astronomical Journal
Spatially resolved UV spectra of the supergiant α Orionis (Betelgeuse) obtained in 1995 March with the Goddard High Resolution Spectrograph (GHRS) on board the Hubble Space Telescope (HST) show that the chromospheric emission in the Mg II h and k (around 280 nm) lines reaches a diameter of at least ~270 milliarcseconds, about twice the size of ultraviolet continuum images obtained at the same time with the HST Faint Object Camera (FOC), and about 5 times the star's optical diameter. The… Expand