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Thank you very much Robin for your help and all your explanations.
I’ll follow the new thread you just opened.
Cheers.
Michel

Hi Michel, Here are my files(zip file attached.) Which one is different to yours ? (I smoothed the MILES spectrum in the posted image to match the resolution of the Pickles spectrum and I still use ISIS 5.9.3 because I prefer that it corrects for the black body curve of the flat lamp but that shoul...

If the two comparisons are not visible, it is necessary to click on the image.
Cheers.
Michel

Where is the truth (sic)? Here is the truth :-) HD207260_miles_dered_0p47_pickles_A2i.png Black is MILES HD207160 dereddened by E(B-V) = 0.47 Red is Pickles A2i Cheers Robin Hello Robin, I tried to make the same comparison as you: -HD207260 Miles (extracted from ISIS library) and dered with E(B-V)=...

Bonjour Michel, Merci pour avoir pointé cette anomalie. Il y avait dans la base une série d'étoiles qui n'avaient rien à y faire. Peut-être une erreur lors d'une mise à jour. La version nettoyée : http://www.astronomie-amateur.fr/Documents%20Spectro/Outils/ReferenceStarFinder_V3.xlsm Désolé pour le...

Robin Leadbeater wrote:

Benjamin Mauclaire wrote: Where is the truth (sic)?

Here is the truth

HD207260_miles_dered_0p47_pickles_A2i.png

Black is MILES HD207160 dereddened by E(B-V) = 0.47
Red is Pickles A2i

Cheers
Robin

Hello Robin,
I just read your message.
Thank you, that's telling, so for HD206270, E(B-V)=0,47.
Cheers.
Michel

Hello Benjamin,
Thank you very much for these links that I discover.
For E(B-V) of HD207260, as a beginner, I don't know which value to use between Caltek(0.88) and the one (0.47) obtained from Simbad and (B-V)intrinsic colours.
Cheers.
Michel

Hello Robin,
Thank you very much for your very clear explanations and for the link to the publication with in particular the table that gives the values of the (B-V)intrinsic colours .

Cheers.
Michel

Hello Robin, So I will redo my measurements (in some time, as I have just disassembled my setup) of HD213470 and HD207260 following your advice to take as star reference HD212454. I will also try to do the spectra of HD213558 and HD210715. Could you tell me how E(B-V) ~0.4 is calculated from the SIM...

Hello Robin, Thank you so much for your help. For the choice of the reference star, after reading several tutorials, I had noted that it was necessary to take a star of type A or B and I used the spreadsheet ReferenceStarFinder to find a reference star from a given target star. Unless I am mistaken,...