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Novae Cas and Per 2020 H alpha line at medium resolution

Image

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About this observation
Observer
Robin Leadbeater
Time of observation
30/11/2020 - 17:20
Object
Nova Cas 2020, Nova Per 2020
Observing location
Wigton cumbria
Equipment
Celestron C11
LHIRES spectrograph 1200l/mm grating
ATIK 314 camera
Exposure
3000s, 8500s

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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