Call for observations of the preoutburst phase of T CrB

Alerts and Monitoring of Novae

Re: Call for observations of the preoutburst phase of T CrB

Postby Rainer Ehlert » Fri Aug 05, 2022 8:34 pm

Hi,

Had a more or less clear night and here another T CrB spectrum.

https://rainerehlert.com/000_Spectra/T_ ... 16b_1D.fit


T_CrB_300s_LISA_1000mm_-0015_BDF_NHSA_20220804_16b.jpg
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°
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Re: Reference Star

Postby Robin Leadbeater » Sat Aug 06, 2022 11:33 am

Francois Teyssier wrote:Peter, Robin, thank you for your interesting inputs.


[i]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
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Re: Call for observations of the preoutburst phase of T CrB

Postby Rainer Ehlert » Sat Aug 06, 2022 6:02 pm

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
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

Postby Rainer Ehlert » Sat Aug 06, 2022 6:07 pm

Hi,

Another T CrB spectrum addition and so I have four now.

https://rainerehlert.com/000_Spectra/T_ ... _16_1D.fit


T_Crb_300s_LISA_1000mm-0726_to_0805_comp_16_1D.jpg
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

Postby Dubreuil Pierre » Sun Aug 07, 2022 3:00 pm

T Crb hier soir, proche IR

UVEX4 G600-750nm, slit 15µ

Spectre T_CrB 6339 to 8299.png
Spectre T_CrB 6339 to 8299.png (128.02 KiB) Viewed 968 times


Pas vraiment d'évolution pour l'instant.

Pierre
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Re: Call for observations of the preoutburst phase of T CrB

Postby Rainer Ehlert » Fri Aug 12, 2022 12:51 am

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


T_Crb_300s_LISA_1000mm-0726_to_0810_comp_16_1D.jpg
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

Postby Francois Teyssier » Fri Aug 12, 2022 9:17 pm

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
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Re: Call for observations of the preoutburst phase of T CrB

Postby Rainer Ehlert » Sat Aug 13, 2022 2:58 pm

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 ;)

Rainer
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