Hello all,
As other observers have noted, the spectrum of Nova Her 2021 is changing very fast !
In particular, the evolution of the Halpha line is already clearly visible at low resolution with a modification of the overall shape of the top of the profile.
I obtained two spectra of the Halpha line of Nova Her 2021 at high resolution on June 14 at 22 h 39 TU (resolution of 18220, JJ = 2459380.4435) and on June 15 at 22 h 43 TU (resolution of 18835, JJ = 2459381.4463) with my LHIRES III (grating of 2400 lines / mm, acquisition time of 60 min for each spectrum (6 x 600s)).

- Halpha line of Nova Her 2021 on June 14th and 15th 2021
- novaher2021_Halpha_Christophe Boussin.png (45.77 KiB) Viewed 3224 times
What is most noticeable is the width of the Halpha line but we can also note the evolution in detail of its profile in one day (especially around +1000 km/s) !
Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database