VV Cephei new campaign

Science Spectroscopy
1

Dear colleagues,

we suggest that the ~43-day V/R periodicity observed in the Ca II 3933 Å line of VV Cephei is caused by a rotating and non-uniform structure within the mass flow of the system. The simultaneous variability seen in different spectral lines indicates that the various regions of the system are strongly coupled and influence each other dynamically.
A possible explanation is a recurring cycle involving shock formation, radiative cooling of the gas, and renewed accretion of material.
To test this interpretation, further high-cadence spectroscopic observations will be essential.
We would be pleased if interested observers could support us in this campaign.

Ernst Pollmann

2

What resolution do you require?

3

Hi Krzysztof
The resolution should not fall below a value of approximately 5,000.

Ernst

4

Yep, I feared you would say that. But thanks for suggesting an interesting target anyway

5

Hi.
I have been submitting H-alpha high definition profiles of VV Cephei to your program last fall and the previous year. I have better gear and VV Cep should come into view for me probably in July or August. I have a Star’Ex 2400 spectrograph and would be interested continuing in the campaign. I haven’t worked in those wave lenghts but it shouldn’t be a problem.
Richard Brown

6

Hi Richard,
thanks for your comment. It sounds optimistic. Good luck.

Ernst