Nova M31

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  • #574775
    Daryl Dobbs
    Participant
    #583304
    Nick James
    Participant

    Here it is on my patrol image from early evening on Oct 26. M31 novae are very frequent and discovering them is very competitive. This image also shows AT 2020vak much closer to the core.  

    #583306
    Robin Leadbeater
    Participant

    Hi Nick,

    Has 2020vak been positively identified as an M31 nova?  I am not saying it isn’t but it wasn’t clear from  the amateur spectrum posted on TNS

    https://wis-tns.weizmann.ac.il/object/2020vak

    Cheers

    Robin

    #583307
    Nick James
    Participant

    You’re right. I tend to be very lax and use the term nova for anything that varies in M31. Transient would be a much better term to use. That spectrum doesn’t look very nova like. It is very close to the core though so how do you stop the spectrum being polluted by the background?

    #583309
    Robin Leadbeater
    Participant

    These are some I have managed to tease out in the past (full scale in the attachment)

    #583308
    Robin Leadbeater
    Participant

    Yes this one is against a bright background. This can be subtracted out using regions above and below the target in the slit but it does depend on this being uniform (both in brightness and spectroscopically) so you have to watch for galactic features. 

    The last time I checked the ATels  this group were suggesting the spectrum resembles that of an F star. This rather rang alarm bells with me though as that is that is what might be expected from the integrated light from the galaxy. I see now here though it has been classified as an Fe II nova. What brightness would you estimate?  (Not that I am going to be observing any time soon from the forecast. As I am writing this the hailstones are hammering on the window)  

    #583310
    Paul Leyland
    Participant

    Just a reminder: M31N 2008-12a is due to go off any day now.  This recurrent nova goes into outburst at roughly 11-monthly intervals and reaches mag 18 or so at maximum. It is visible for only a few days each time and nightly monitoring of the field is recommended.

    https://arxiv.org/pdf/1607.08082.pdf contains a finder chart and magnitudes in a number of photometric bands for a number of comparisons.

    #583311
    Nick James
    Participant

    It is difficult to get a reliable magnitude but 2020 vak was around 16.6 (unfiltered vs Gaia DR2 G) on my image of Oct 26.8.

    #583312
    Nick James
    Participant

    This is in one of my lesser patrolled fields around M31 (my field 15). I try to get a deep image of the core of M31 every available night but I’ll keep an eye on this field too. Nothing there at the moment.

    #583325
    Ernesto Guido
    Participant

    Hi All

    I just opened this thread about the new outburst of M31N 2008-12a:

    https://britastro.org/node/24796

    Ciao,

    Ernesto

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