V1674 Hercules: It is Blowing out a Wind

Abstract

Abstract V1674 Her was not only the fastest nova on record, it was also a rare hybrid event, showing a transition between the Fe ii and He/N nova classes as early as 5.5 days after the outburst. Spectra now indicate the outburst is over; emission lines from the underlying binary system are now seen, although broad but weaker forbidden nebular emission lines are also present. Intriguing at this late evolutionary stage is a P Cygni-like line profile associated with Hα suggesting the presence of a wind emanating from the binary system. The profile exhibits intensity and velocity variations perhaps correlated with its 0.153 day orbital period.