ISIS b-v values

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ISIS b-v values

Postby Robin Leadbeater » Mon Apr 30, 2018 3:14 pm

During reduction, ISIS generates b and v values for each exposure but I cannot find any information on what they are or what they are used for

iis_b-v_values.png
iis_b-v_values.png (5.83 KiB) Viewed 343 times


Are they the mean intensity in the standard photometric b, v passbands?

Thanks
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: ISIS b-v values

Postby Robin Leadbeater » Sat May 12, 2018 2:02 pm

Anyone ?
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: ISIS b-v values

Postby Joan Guarro Flo » Sat May 12, 2018 2:15 pm

Hi Robin,
You're not alone
Yes, what and I'm, but I don't understand and I don't know the answer.

Friendly, Joan.
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Re: ISIS b-v values

Postby Christian Buil » Mon May 14, 2018 9:20 am

Robin,

(b) - (v) information is indicative of the impact of atmospheric chromatism (or telescope chromatism) on the spectrophometric quality of the collected data in a sequence of spectra.

This situation is explained for many examples on the web page (in French sorry):

http://www.astrosurf.com/buil/dispersion/atmo.htm

(some time dramatic !)

It is an arbitrary parameter that allows to reject some very affected spectra. This is the case of spectra whose index (b) and (v) (relative intensities) deviate much from the average or median value of a sequence.

Christian B
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Re: ISIS b-v values

Postby Robin Leadbeater » Mon May 14, 2018 1:12 pm

Thank you Christian,

This could be useful now for V392 Per which is very low. There are some big variations in the continuum of the published spectra.

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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