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(cba:news) strike V1974 Cyg (Joe Patterson) [2017-09-12T07:12:54Z]


Hi CBAers,

Delete V1974 Cygni from the menu. I finished the analysis of all the data (dominated by David Cejudo's), and there is a very clear detection of the orbital signal. In fact, two, separated by ~90 days (we never had that before, and it's very useful to connect the years).

The detection and measurement of the phase of the orbital signal was the goal... and we have it now. Especially nice since the detection is uncontaminated by superhumps; we never had that before, also. Two other things we'd *like* to know are:

(1) What is the phase of the radial velocity variation when the light reaches its orbital max?

(2) Just how bright is the continuum? The 4000-8000 A region, where we observe the star at "17.12", is probably dominated by the O III emission at 5007 A. That emission from the shell needs to be subtracted to learn how bright the central object is.

Only a very motivated spectroscopist could answer (1); so far, none have piped up. (2) is best learned from a single high-quality spectrum; someone might have that. But if you have a filter which excludes that terrible monstrosity at 4959/5007 A, and preferably also H-alpha, you might learn that. Might be worth an effort. You don't necessarily need to detect the periodicity (at 0.08126 days); just measuring the brightness of a clean, line-free continuum would allow us to correct our measurement for all that unwanted and so-far-unmeasured nebular light.

Pretty nice result for "the nova of the century"!

joe
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