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Re: VV Cep: Fe absorptions increase around Ca II doublet

PostPosted: Sun Mar 10, 2019 2:50 pm
by Peter Somogyi
Dear All,

I've been following this object in eclipse from 2018.05.26 - 2018.12.31.
However, it's been rather eventless during eclipse, and I won't be able to observe it again till end of 2019 MAY.
Despite little (real) changes, presenting here last year's result:
This graph includes results also from 2017 (first 3 blue dots)
vvcep_uv1_20180108_20180804.png (100.1 KiB) Viewed 483 times

vvcep_uv1_20180909_20181231.png (101.43 KiB) Viewed 483 times

vvcep_uv2_20180701_20181030.png (122.02 KiB) Viewed 483 times

I've also started measuring flux using my photometric slit's wide part:
vvcep_fluxes_2018.png (13.53 KiB) Viewed 483 times

Blue dots fluxes + the very first green dot flux measurements are estimated by earlier method (viewtopic.php?f=19&t=1798&start=80#p10027).
Took typically ~ 2 minute for ref. star, 2 minute for 7 Cep (as a 2nd check), and 10 min. for VV Cep itself. Then usually taken 12 x 600 for the higher UV region, and 6 x 1200 seconds for the lower UV region.
When switcing to wide slit (= the first red dot on graph), started using the ref. star 27 cyg from Miles, but since 2458370 (2018.SEP) switched to 11 Cep.

Only spotted one remarkable event, on 2018.12.31 the H8 feature seems to have changed (but no further data). This is in sync with Alpy observer's H-beta changes.
The bad weather in Nov-Dec prevented me any observation, and afterwards I was not lucky enough to catch early evening with any clear sky. Next possible observation could be the end of May.


EDIT: uploaded these spectra (taken in 2018) to britastro specdb.