Radius Estimation of VV Cep´s disk

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  • #578146
    Jack Martin
    Participant

    Ernst,

    Yes OK I will send this observation next week.

    Regards,

    Jack

    Essex UK

    #578147
    Jack Martin
    Participant

    Ernst,

    I can also provide baseline observations from 2015-08-26.

    Regards,

    Jack

    Essex UK

    #578148
    Ernst Pollmann
    Participant

    Jack, I have evaluated your 2015-09-10 spectrum. Please have a look at the Spectro-L Yahoo-List. I think also it would be at present more important to get a reliable base line, because we are in the “hot phase on the way” to the eclipse.

    Ernst

    #578298
    Ernst Pollmann
    Participant
    #578322
    Ernst Pollmann
    Participant

    A revision of the analysis of the previous campaign spectra has now led to the use of the equivalent width (EW) of the red and blue components for the determination of the baseline.
    See: http://www.bav-astro.eu/index.php/veraenderliche/bedeckungsveraenderliche/vv-cep-kampagne

    To translate the German text use the Google-translater.

    In view of the immediate imminent eclipse, a well-defined base line now appears for both, the peak height and the EW. At the upcoming OHP spectroscopy session in the last week of July, we will try to improve the quality of the baselines by further observations.

    Ernst Pollmann

    #578329
    Ernst Pollmann
    Participant

    Dear colleagues,
    please don´t forget to observe VV Cep.
    It is not exclude that the eclipse could begin some days before the calculated date August 4th.

    Ernst

    #578333
    MARC TRYPSTEEN
    Participant

     Indeed, thanks for this alert Ernst,

     Besides your message: “it is not exlude that the eclipse could begin some days before the calculated date August 4th”

     it could also be later. According to the work of Leedjärv et.al. (A&A 1999) it seems the orbital period has a tendency of increasing between the eclipses due to a possible mass transfer or mass ejection. (Approximately 1% per two former eclipses).

    http://adsabs.harvard.edu/full/1999A%26A…349..511L

    Anyway we hope the weather conditions will be favourable at the very moment of the (calculated) beginning of the eclipse.

    Usefull weather info with “observation location” input possibility:  

    http://www.meteoblue.com  or http://www.meteovista.com/international/4220/0 

    Kind regards,

    Marc.

     

Viewing 7 posts - 21 through 27 (of 27 total)
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