H-alpha Spectroscopy of Nova V1674 Her
ATel #14740; D. D. Balam (DAO/NRC), D. Bohlender (DAO/NRC), P. Koubsky (Academy of Sciences of the Czech Republic) and J. Labadie-Bartz (University of Sao Paulo)
on 27 Jun 2021; 14:18 UT
Distributed as an Instant Email Notice Novae
Credential Certification: David D. Balam (cosmos@uvic.ca)
We report optical spectroscopic observations of the very fast nova V1674 Her (TCP J18573095+1653396) between UT 2021 June 19 to 24, obtained at R = 17,600 using the McKellar (Coude) spectrograph (Richardson E. H., 1968, J. R. Astron. Soc. Can., 62, 313) on the 1.22-m telescope at the Dominion Astrophysical Observatory (National Research Council of Canada). Our high-resolution spectra confirm the existence (ATel #14723) of emission sub-peaks at 6596.6(+1535 km/s), 6588.0(+1142 km/s), 6579.3(+74 km/s), 6562.0(-46 km/s), 6551.9(-507 km/s) and 6521.8(-1882 km/s) Angstroms. The over-all shape of the H-alpha line is unchanging over our 6 nights of observation and stronger on the blue-ward side of the profile. We have measured the FWHM of H-alpha from 8 spectra and find it to be 5150 (+/- 25) km/s), In addition, the measured FWZI is increasing monotonically from 7836 km/s (June 19) to 8638 km/s on June 24. There appears to be a prominent P-Cyg absorption line located at 6530 A (-1500 km/s) on the UT June 19 spectrum and consistent and slowly shifting blue-ward over our span of observations.
The diffuse inter-stellar line at 6613 Angstroms is well-defined on the red side of the H-alpha profile, We find the line to have an average equivalent width of 0.158 A from 8 spectra.
