Nova Vul 2021

Forums Variable Stars Nova Vul 2021

Viewing 20 posts - 1 through 20 (of 31 total)
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  • #575006
    Jeremy Shears
    Participant

    This 12th mag transient in Vul recently posted on CBAT Transients page:

    http://www.cbat.eps.harvard.edu/unconf/followups/J20210770+2914093.html

    Amplitude is 9 mags

    #584473
    Nick James
    Participant

    Here’s the field. I get it around mag 12 (unfiltered re Gaia G) and a position of 20:21:07.71 +29:14:08.9 (Gaia DR2).

    #584475
    Robin Leadbeater
    Participant

    A Low resolution (R~500) spectrum taken just now (20210716.915) shows strong H Balmer P Cygni profile emission lines with a velocity of ~1400km/s and other broad emission lines including He. (Looks like it is a Nova) 

    https://britastro.org/specdb/data_graph.php?obs_id=10094

    Continuing to take spectra.

    Robin

     

     

    #584478
    Jeremy Shears
    Participant

    Further confirmation as nova: https://www.astronomerstelegram.org/?read=14793

    #584479
    Lars Lindhard
    Participant

    I saw it visually on 16. july 22.30 UT. Mag about 12.

    Lars

    #584480
    Jeremy Shears
    Participant

    There is an AAVSO chart and sequence here.

    You can re-scale and re-orientate to your liking here.

    #584474
    Gary Poyner
    Participant

    I’ve just seen it visually at mag. 12.0 on Jly 16.948 UT,   It’s a very red field, so poor comparison choices (high B-V).

    Gary

    EDIT July 18:  With the release of the AAVSO sequence, the above magnitude of 12.0 should be revised to 12.3.   Fortunately the AAVSO selected the same comparison star I used, but with a slightly fainter value.

    Gary

    #584481
    Robin Leadbeater
    Participant

    Spectra from the past two nights. (The first predates the one in the ATel by 4 hours) I have marked the main lines but there are a few currently unidentified. Suggestions welcome

    #584482
    David Boyd
    Participant

    Hi Robin,

    As I just posted in reply to your question on the ARAS Forum, I think these lines are C II which are seen in He/N novae.

    This spectrum was recorded last night 17th July with a LISA and calibrated in absolute flux using the concurrently measured V magnitude of 13.10.

    David

    #584485
    Robin Leadbeater
    Participant

    Thanks David. Excellent reproducibility between our spectra taken less than an hour apart though my ALPY spectrum (in pink) is lower resolution of course.

    Cheers

    Robin

    #584492
    Jeremy Shears
    Participant

    After a drop in brightness in the first 24 h, the nova has been at ~mag 13 the last 3 nights. Not much of a light curve so far as we are in the early days of this eruption. Further observations are encouraged.

    #584493
    Nick James
    Participant

    The nova is about 0.3 mag brighter tonight (July 20) than it was yesterday. My unfiltered photometry is around 0.4 mag brighter than V band since the nova is so red but the trend is pretty clear.  Of the other novae around V1405 Cas is brightening again although still around a magnitude below its brightest and V1674 Her is very gradually fading after its initial rapid decline. 

    #584495
    Jeremy Shears
    Participant

    Yes, definitely a bit brighter last night, Nick: ~0.25 mag brighter on Jul 20 in CV for me compared to 24 h earlier.

    #584507
    Jeremy Shears
    Participant

    Continues to brighten gradually:

    #584514
    Robin Leadbeater
    Participant

    There has been significant evolution in the spectrum, the He I N II C II lines being replaced by Fe II lines as the classification Atel suggested might happen

    Cheers

    Robin

    #584516
    Daryl Dobbs
    Participant

    Awful seeing last night, haze and patchy cloud, managed to get 1 visual observation with my 10 inch which I’ll upload late. Weather forecast doesn’t look good for the next couple of night. Skies around here Risca just outside Newport in Wales do have a lot of light pollution 

    #584550
    Robin Leadbeater
    Participant

    The evolution to an Fe II type nova as I highlighted in my spectrum from 24th July has now been confirmed 

    https://www.astronomerstelegram.org/?read=14816

    Cheers

    Robin

    #584551
    Nick James
    Participant

    Interesting to read that ATEL. I’ve managed to observe it on 12 of the 14 nights since discovery and my unfiltered photometry shows it still rising as of last night.

    #584555
    Nick James
    Participant

    CBET 5007 has designated this as Nova Vul 2021 = V606 Vul. To quote: “R. Leadbeater, Wigton, U.K., writes that a low-resolution (R about 500) spectrogram taken on July 16.915 UT (instrumentation not specified) shows strong Balmer lines in emission showing P-Cyg profiles with an estimated velocity of about 1400 km/s, adding that there are other broad emission lines including He; the spectrogram has been posted at website URL https://britastro.org/specdb/data_graph.php?obs_id=10094.”

    #584556
    Robin Leadbeater
    Participant

    Hi Nick,

    I guess that is Nova Vul 2021 not 2001. Is that from Dan Green ? I wondered why he was asking about my instrumentation this afternoon. He must have posted it before I replied

    Cheers

    Robin

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