Hi,
Had a more or less clear night and here another T CrB spectrum.
https://rainerehlert.com/000_Spectra/T_ ... 16b_1D.fit
Call for observations of the preoutburst phase of T CrB
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Re: Call for observations of the preoutburst phase of T CrB
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°
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Re: Reference Star
Francois Teyssier wrote:Peter, Robin, thank you for your interesting inputs.
HD143894 is A3V with V = 4.82 with no mention of variability so is likely to be the better choice for low resolution use. You will need to use a Pickles A3V spectrum for this. This is available with ISIS.
Perhaps someone with reliable photometric skies (not mine!) can measure this star relative to standards eg CALSPEC to confirm its spectrum relative to the Pickles spectrum ?
Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
http://www.threehillsobservatory.co.uk
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Re: Call for observations of the preoutburst phase of T CrB
Hi Francois,
I can not send you e-mails. I get answered that your e-mail does not exist. francoismathieu.teyssier at gmail dot com ...
Please contact me at
eastpier at rsfotografia dot com
Thank you and regards Rainer
I can not send you e-mails. I get answered that your e-mail does not exist. francoismathieu.teyssier at gmail dot com ...
Please contact me at
eastpier at rsfotografia dot com
Thank you and regards Rainer
Last edited by Rainer Ehlert on Sat Aug 06, 2022 6:18 pm, edited 2 times in total.
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°
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Re: Call for observations of the preoutburst phase of T CrB
Hi,
Another T CrB spectrum addition and so I have four now.
https://rainerehlert.com/000_Spectra/T_ ... _16_1D.fit
Another T CrB spectrum addition and so I have four now.
https://rainerehlert.com/000_Spectra/T_ ... _16_1D.fit
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°
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Re: Call for observations of the preoutburst phase of T CrB
T Crb hier soir, proche IR
UVEX4 G600-750nm, slit 15µ
Pas vraiment d'évolution pour l'instant.
Pierre
UVEX4 G600-750nm, slit 15µ
Pas vraiment d'évolution pour l'instant.
Pierre
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Re: Call for observations of the preoutburst phase of T CrB
Hi,
Yesterday night eg. today morning UTC time I imaged T CrB. See below the comparison of 5 spectra from 26-07 to 10-08 and I ahve the impression teh emission lines 4640 and 4684 are stronger or is it just my imagination ?
Thanks for looking
Yesterday night eg. today morning UTC time I imaged T CrB. See below the comparison of 5 spectra from 26-07 to 10-08 and I ahve the impression teh emission lines 4640 and 4684 are stronger or is it just my imagination ?
Thanks for looking
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°
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Re: Call for observations of the preoutburst phase of T CrB
Hi Rainer,
Interesting.
But the height of a line is a very poor measure as it depends significantly of the resolution at that wavelength.
The measure of the equivalent width (EW) will provide more accurate measures.
I suggest using plot spectra (Tim Lester), a very nice tool.
http://spectro-aras.com/forum/viewtopic.php?f=51&t=2820
Keep us informed!
And , as the level of the continuum is almost the same between H beta and He II, the ratio of the EW HeII/Hb provides useful information about the temperature of the hot source.
François
Interesting.
But the height of a line is a very poor measure as it depends significantly of the resolution at that wavelength.
The measure of the equivalent width (EW) will provide more accurate measures.
I suggest using plot spectra (Tim Lester), a very nice tool.
http://spectro-aras.com/forum/viewtopic.php?f=51&t=2820
Keep us informed!
And , as the level of the continuum is almost the same between H beta and He II, the ratio of the EW HeII/Hb provides useful information about the temperature of the hot source.
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: Call for observations of the preoutburst phase of T CrB
Francois Teyssier wrote:Hi Rainer,
Interesting.
But the height of a line is a very poor measure as it depends significantly of the resolution at that wavelength.
The measure of the equivalent width (EW) will provide more accurate measures.
I suggest using plot spectra (Tim Lester), a very nice tool.
http://spectro-aras.com/forum/viewtopic.php?f=51&t=2820
Keep us informed!
And , as the level of the continuum is almost the same between H beta and He II, the ratio of the EW HeII/Hb provides useful information about the temperature of the hot source.
François
Hi Francois,
Thanks and I downloaded it yesterday and now I just need to understand the program and how to use it.
I was able to shoot another hour of T CrB yesterday night. Will see how it compares to August 10th
![Wink ;)](./images/smilies/icon_e_wink.gif)
Rainer
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°