VV Cephei H alpha emission 2017-07-13

[marcoastro+]

Indeed Jack, no major changes yet...only slow peak decline.
Perhaps monitoring Hydrogen ß could help to see changes clearer.

Kind regards,
Marc.

[Ernst Pollmann]

Hi Marco,
how to recognize, you are back again at the activity stage. Great.
I am asking for your VV Cep spectrum. Could you send me it or upload at the BAA data base?

Ernst

[Jack Martin]

Robin,

That's on my to do list, today I posted a 1D spectrum for login.

Regards,

Jack

Essex UK

[Jack Martin]

Marc,

Monitoring the H Beta line OK but will the results be clearer and will it be useful data and published for the campaign ?

Jack

Essex UK

[Jack Martin]

Marc,

That's a nice spectrum, I see a difference between your 35 and my 23 micron slit widths.

Regards,

Jack

Essex UK

[marcoastro+]

Hi Jack,

Indeed the main investigation of this campaign is now the H-alpha behaviour.
However the ingress and egress phases of the eclipse can be well monitored as reported by Moellenhoff et al H-ß variations seem to be more rapidly noticable.

Ingress H-ß monitoring: http://adsabs.harvard.edu/full/1978A%26A....64..253M

Egress H-ß monitoring: http://adsabs.harvard.edu/full/1981A%26A....94..333M

Kind regards

[Olivier GARDE]

Here's a spectrum taken last night with eshel spectrograph

Order 34 : H alpha

[Ernst Pollmann]

... a great (first class) spectrum, Olivier. That´s a quality I love. It´s evaluated meanwhile.
I calculated the radial velocity (see Fig. below): RV = -18.5 km/s.
The average value of approx. 40 measurements with different spectrographs = - 22.2 km/s (+/- 1.9 km/s)

Ernst