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:
I've also started measuring flux using my photometric slit's wide part:
Blue dots fluxes + the very first green dot flux measurements are estimated by earlier method (http://www.spectro-aras.com/forum/viewt ... =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.
VV Cep: Fe absorptions increase around Ca II doublet
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Re: VV Cep: Fe absorptions increase around Ca II doublet
Hello,
Finally, got enough time to process my VV Cep obsertvations about the egress phase, continuing with flux (same way as in 2018 during eclipse).
Followed only the CaII region (3850-4005A) for the egress at R~5000 (except 20191229.751 that is showing deep reverse P-Cyg, such as before ingress), using same instruments (300/1200 Newton + APM Barlow 2.67x + LHires III + 2400/mm grating + 35 micron slit + ATIK 428 EXm + external UV flat).
Firstly, I have missed most of the chromospheric egress, got only 1 spectrum (2019.03.23: JD=2458565) resembling as an intermediate state: However, within 1 week on 2019.05.18 - 05.24 (JD: 2458621-2458628), there has been a sudden jump in the continuum flux, accompanied with strong CaII emissions appearance: It is easy to prove, that both the CaII doublets (3933, 3968 A) got suddenly the strong emissions (e.g. subtraction of previous spectrum).
Further away from eclipse, a similar flux level of continuum sustained and slightly increased, with later the reverse P-Cyg appearing on both CaII and Balmer: The strong CaII emissions remained on ALL spectra since JD:2458628, and it was not present before (back in eclipse).
The appearance of CaII emission (JD: 2458621-2458628) is somewhat symmetric by timing with the disappearance before ingress (it happened few months before ingress).
Earlier literature's public data does not have such a dense time serie about this emission, and the coincidence with sudden flux increase may be not random.
Uploaded spectra to britastro.org/specdb .
Finishing this project for now, plan to take maybe 1 per year in this region.
Peter
Finally, got enough time to process my VV Cep obsertvations about the egress phase, continuing with flux (same way as in 2018 during eclipse).
Followed only the CaII region (3850-4005A) for the egress at R~5000 (except 20191229.751 that is showing deep reverse P-Cyg, such as before ingress), using same instruments (300/1200 Newton + APM Barlow 2.67x + LHires III + 2400/mm grating + 35 micron slit + ATIK 428 EXm + external UV flat).
Firstly, I have missed most of the chromospheric egress, got only 1 spectrum (2019.03.23: JD=2458565) resembling as an intermediate state: However, within 1 week on 2019.05.18 - 05.24 (JD: 2458621-2458628), there has been a sudden jump in the continuum flux, accompanied with strong CaII emissions appearance: It is easy to prove, that both the CaII doublets (3933, 3968 A) got suddenly the strong emissions (e.g. subtraction of previous spectrum).
Further away from eclipse, a similar flux level of continuum sustained and slightly increased, with later the reverse P-Cyg appearing on both CaII and Balmer: The strong CaII emissions remained on ALL spectra since JD:2458628, and it was not present before (back in eclipse).
The appearance of CaII emission (JD: 2458621-2458628) is somewhat symmetric by timing with the disappearance before ingress (it happened few months before ingress).
Earlier literature's public data does not have such a dense time serie about this emission, and the coincidence with sudden flux increase may be not random.
Uploaded spectra to britastro.org/specdb .
Finishing this project for now, plan to take maybe 1 per year in this region.
Peter
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- Joined: Mon Sep 26, 2011 7:16 pm
Re: VV Cep: Fe absorptions increase around Ca II doublet
Hi Peter,
as you know our professional tutor Phil Bennett is writing in collaboration with his phd student and us a further more scientifically paper. The results of your observation within this spectral range might be worth to account. At present I am going to collect all the spectra I got during the last three years to offer it Phil, for a new and more extended (than I did it) evaluation by his student.
Ernst Pollmann
as you know our professional tutor Phil Bennett is writing in collaboration with his phd student and us a further more scientifically paper. The results of your observation within this spectral range might be worth to account. At present I am going to collect all the spectra I got during the last three years to offer it Phil, for a new and more extended (than I did it) evaluation by his student.
Ernst Pollmann