VV Cephei news

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Viewing 20 posts - 21 through 40 (of 44 total)
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  • #578433
    Jack Martin
    Participant

    Steve,

    I will follow your instructions.

    Thanks for your response.

    Jack

    Essex UK 

    #578437
    Jack Martin
    Participant

    Marc,

    I can send data to Robin for analysis who can post comparative results on this forum for the benefit of all. 

    Jack

    Essex UK

    #578438
    MARC TRYPSTEEN
    Participant

     Excellent, Jack, good idea.

     Perhaps you can also upload spectra to the Spectroscopy Database…….

     Kind regards,

     Marc.

    #578439
    Andy Wilson
    Keymaster

    Hi Jack,

    You can measure the resolution using BASS, as per section 9a of the BASS tutorial I wrote (I think you have already done this):

    You can also create a .png, .jpg or .bmp of your spectrum graph at any time by selecting:

    Chart -> Save Chart to file

    These will be small compared to the original fits file.

    Best wishes,

    Andy

    #578441
    Robin Leadbeater
    Participant

    Hi Jack,

    Spectrum profiles (in fits or dat format) are also small enough to be uploaded as attachments here if you need advice and are not ready to submit them to the database. For example here is my latest for VVCep at the blue end. It is a work in progress as I am not 100% happy yet with the instrument response/atmospheric extinction correction so I have not yet committed it to the database. (Note I had to change the extension from .fit to .fits as the forum does not accept .fit )

    Robin

    #578443
    Jack Martin
    Participant

    Marc,

    I am awaiting Robins response on this one.

    Also, just a minor point to resolve before I can upload spectra to the database.

    Regards,

    Jack

    Essex UK

    #578444
    Jack Martin
    Participant

    Andy,

    In our last communication I measured the resolution and inserted it the fits file.

    I have posted a png file of my latest ‘quick’ spectrum of the h alpha profile of vv cep.

    Regards,

    Jack

    Essex UK   

    #578442
    Jack Martin
    Participant

    Andy,

    You mean like this, the latest ‘quick’ spectrum of vv cep taken around 22.00 hr 2017-08-10 revealing no changes in the h alpha profile yet.

    Regards,

    Jack

    Essex UK

    #578445
    Jack Martin
    Participant

    Robin,

    I can’t open your attachment.

    Regards,

    Jack

    Essex UK 

    #578447
    Robin Leadbeater
    Participant

    Hi Jack,

    It is a fits spectrum profile to BeSS standard as used in the BAA database for example (Are you trying to open it as an image?)  It will open in VSpec, ISIS, BASS etc. (change the extension from .fits back  to .fit if you are having difficulties)

    Cheers

    Robin 

    #578448
    Robin Leadbeater
    Participant

    Jack said

    I am awaiting Robins response on this one.”

    Hi Jack,

    Not sure what this relates to. What do you want to know ?

    #578449
    Robin Leadbeater
    Participant

    Hi Jack,

    You have a lot of cosmetic defects (the narrow spikes caused by hot pixels.) This is quite surprising with such a  bright target. Are your dark and hot pixel map corrections working OK?

    Robin

    #578454
    Jack Martin
    Participant

    Robin,

    The response I am waiting for is if you are able to do a comparison between the spectra obtained by Marc and my spectra, as taken with Marcs C11 and my C14.

    Please refer to Marcs previous post for info.

    Regards,

    Jack

    Essex UK

    #578455
    Jack Martin
    Participant

    Robin,

    This was just a 300 s raw exposure uncalibrated, no dark or flat frames just to check if the h alpha line has changed.

    Regards,

    Jack

    Essex UK

    #578457
    Jack Martin
    Participant

    Robin,

    I will open your fits file in my other computer which has the appropriate program.

    Regards,

    Jack

    Essex UK

    #578458
    Robin Leadbeater
    Participant

    Hello Jack,

    The fits spectrum profile I attached was just to show you how it can be done on the forum. The content is not important. It just happened to be a recent spectrum that I was working on.

    Robin 

    #578459
    Robin Leadbeater
    Participant

    Hello Jack,

    I  had not planned to do that. I just described how it could be done if you wanted to. I suggest you and Marc get together directly to make the comparison.

    Cheers

    Robin

    #578473
    Jack Martin
    Participant

    No changes in H Alpha emission profile as of 2017-08-13, I am continuing to monitor.

    Jack

    Essex UK

    #578474
    Paul Luckas
    Participant

    Although I can’t see VV Cep from my latitude, I’ve been following this project with great interest (having seen Ernst’s excellent presentation at the OHP in 2015 – my first exposure to this remarkable star). I think this is another example of great community involvement and coordination of observations (both here and on the ARAS channel) the value of which cannot be underestimated.

    Keep up the great work Ernst, Jack and all.

    Paul

    #578479
    Jack Martin
    Participant

    Paul,

    Thank you for your encouragement, its good to know others are following the forums.

    Onwards and upwards.

    Regards,

    Jack

    Essex UK

Viewing 20 posts - 21 through 40 (of 44 total)
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