(cba:news) (cba:chat) ASASSN-V J205457.73+515731.9 of ATel #13824, anyone?

Joe Patterson jop at astro.columbia.edu
Thu Jun 25 08:08:35 EDT 2020

Hi Heinz,

Yes, now that I look over the information available so far, it looks 
like a star very much worth investigating - by us, as well as by other 
techniques (spectroscopy, astrometry, etc.)  QPOs are certainly 
commonplace among CVs, but the photometric history and nearby nebula 
makes it extremely interesting.  i think this should be a prime object 
for morning observing these days - although beware the crowded field!

For now.  Let's see if CBAers can get clean observations of this star.

BTW my plaintive cry for HP Lib observations, especially in the north, 
met with a great response.  We now have a sufficiently dense record to 
track that minuscule orbital signal.  Some continued coverage is needed 
to track the relatively large (easy to measure!) superhump signal... but 
long coverage is not needed for that.

joe p

On 6/25/2020 6:46 AM, Heinz-Bernd Eggenstein wrote:
> Hi all!
> I wonder whether anyone here has been looking at the CV candidate ASASSN-V J205457.73+515731.9 of ATel #13824,13825,13829
> I have requested an AAVSO sequence for it which is now available. Note that the comp stars are all considerably redder, and also there is another source within only ~7" separation. It's an easy target at ca 14.5 mag (V).
> I've put my first obs data into the AAVSO database. Needless to say I cannot do any long runs on this (or anything else) from Germany at this time of year, but it seems obvious that there is very significant QPO-like variability on timescales of  10s of minutes, with a peak in the periodogram at ca 24 minutes.
> I certainly don't want to distract CBAers from program stars, I was just wondering whether this is an interesting target at all or just boring stuff (it seems to be in a relatively rare state now that might reveal things not obvious when it is in its usual state of stable accretion??, and because the authors of ATEL #13824 had doubts about its classification). I have two more short data stretches that I'll reduce soon.
> CS
> HB
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> Heinz-Bernd Eggenstein, Scientific Software Engineer
> Max Planck Institute for Gravitational Physics
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