Image Details
Caption: Figure 1.
Swift UVOT grism development of Hδ and He II 4686 Å emission lines in RS Oph comparing the 2006 and 2021 outbursts (uncorrected for extinction). The 2021 outburst data have been multiplied by a constant factor of 22. See text for discussion.
© 2022. The Author(s). Published by the American Astronomical Society.