Observation by Robin Leadbeater: Novae Cas and Per 2020 H alpha line at ...
Uploaded by
Robin Leadbeater
Observer
Robin Leadbeater
Observed
2020 Nov 30 - 17:20
Uploaded
2020 Dec 02 - 16:49
Equipment
- Celestron C11
- LHIRES spectrograph 1200l/mm grating
- ATIK 314 camera
Exposure
3000s, 8500s
Location
Wigton cumbria
Target name
Nova Cas 2020, Nova Per 2020
Title
Novae Cas and Per 2020 H alpha line at medium resolution
About this image
It is not often that two novae are bright enough to record medium resolution (R=5500) spectra on the same night. Here Nova Per 2020, a few days old near maximum at V mag ~8.5 is compared with Nova Cas 2020, 4 months old but still bright at V mag ~12.5, having undergone a series of rebrightennings.
Despite being 4 magnitudes fainter in V, the H alpha emission relative to the continuum is much stronger in nova Cas compared with nova Per and stands out well against the faint continuum in the spectrum images.
The H alpha line profiles are plotted in terms of radial velocity which maps the line of sight velocity of different parts of the ejecta.
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