[vsnet-chat 1113] Photometric errors

[Gianluca Masi <gianmasi@fr.flashnet.it>]

Dear Colleagues,
as I am relatively new in this field, I would like to know how I can
give a rough estimate of the error in my photometric measures.

Consider this example. I'm following a variable star, using two
reference stars. The magnitude difference between these stars is not too
large, over all the observed period.

I draw the light curves V-C1 and C1-C2 (differential photometry). I find
that the C1-C2 curve shows value between -0.05 and -0.13. 

Can I assume, as a rough estimate, that the error is (0.13-0.05)/2=0.04
mags or I have absolutely to go deeper, considering the details of noise
in the measures?


Best Regards,
Gianluca

PS- First photometry of the variable I discovered last year is posted at
http://vsnet.eurolink.it/comets/masivar.html It has inspired the question
above.
-- 
***********************************************************************
* Gianluca Masi                           "Two things fill the soul   *
* Via Madonna de Loco, 47               with awe and reverence [...]: *
* 03023 Ceccano (FR)                     the starry sky above me and  *
* ITALY                                    the moral law within me"   * 
* email: gianmasi@fr.flashnet.it                                      *
* http://vsnet.eurolink.it/comets/                        I. Kant       *
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