VV Cep: Fe absorptions increase around Ca II doublet

VV Cep 2017-2019 Campaign
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Re: VV Cep: Fe absorptions increase around Ca II doublet

Postby Peter Somogyi » Sun Mar 10, 2019 2:50 pm

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:
vvcep_uv1_20180108_20180804.png
This graph includes results also from 2017 (first 3 blue dots)
vvcep_uv1_20180108_20180804.png (100.1 KiB) Viewed 479 times

vvcep_uv1_20180909_20181231.png
vvcep_uv1_20180909_20181231.png (101.43 KiB) Viewed 479 times

vvcep_uv2_20180701_20181030.png
vvcep_uv2_20180701_20181030.png (122.02 KiB) Viewed 479 times

I've also started measuring flux using my photometric slit's wide part:
vvcep_fluxes_2018.png
vvcep_fluxes_2018.png (13.53 KiB) Viewed 479 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.

Cheers,
Peter

EDIT: uploaded these spectra (taken in 2018) to britastro specdb.
Peter Somogyi
 
Posts: 384
Joined: Sun Jul 13, 2014 8:56 am

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