P Cygni profiles in sodium, what is the cause? › Forums › Variable Stars › Nova in Cas › P Cygni profiles in sodium, what is the cause? 26 September 2020 at 7:07 pm #583179 John CoffinParticipant It looks as if there are P Cygni profiles in sodium. Is the sodium interstellar, and if so, what causes the P Cygni profile? Is the emission component due to photoexcitation by UV from the white dwarf or some other mechanism? Thanks.
