Hello, AO Psc is a cataclysmic system, ie a binary with an accreting white dwarf. The orbital period is Porb=4h. The white dwarf has a strong magnetic field ...
Hello Michel, That is a very interesting system you are studying there and an unusual use for the Star Analyser too. Mag 14.8 is rather faint for amateur...
Hello, I am sorry and confused, but please ignore my previous post: I just realize that there is a background star (R=16.5 in the USNO-A catalog) overlaid with...
Robin, I use MaximDL to stack the images, to rotate the resulting image so as the spectrum is horizontal and to output a CSV file from a line profile; I input...
Hi Michel, Did you take several lines of pixels for the spectrum? This can help with signal to noise. Do you know the Visual Spec software written by Valerie...
Hi Robin, With MaximDL a "line" profile may actually be a rectangular box. I use this with the spectrum height as the box height to have more signal. Hbeta...
Hello all, The basic equation to compute the wavelength as a function of the diffracted angle is: sin(alpha)+sin(beta) = k*m*lambda with alpha the incident...
Hi Jaques, It is too low for me here at lat 55 deg but you are right it will be a superb target for the Star Analyser for those further South and it should be...
Hello Michel, Very interesting. That is the fist time I have seen an analysis including the effect of the zero order being off axis. I usually assume a linear...
I find this site in french http://www.cosmovisions.com/etdo.htm they said we can see if it is real double star by the spectro 2 star near side by side and...
I find this site in french http://www.cosmovisions.com/etdo.htm they said we can see if it is real double star by the spectro 2 star near side by side and...
Radial velocity and gravitational redshift measurement of binaries is well beyond the resolution of the Star Analyser unfortunately but an eclipsing binary...
Robin, Check StarLight Pro software (http://www.midnightkite.com/binstar.html). There are some exemples included in. You can check the geometry of the systems...
also this one french one whit Lhires III double star spectro exemple bêta Aur http://www.shelyak.com/fr/binaires.html 57 Cyg whit data table and grapic ...
Hi Jacques, 1) The radial velocity of a star due to the gravitational pull of a companion is ~100km/s. A spectral resolution of about 10000 is then needed, far...
Jacques, Lhires III is a high resolution spectrograph. Power of resolution is around 17000. This number measures the spectrograph ability to separate adjacent...
ok but me I experiment whit cd transmitted spectro it is about 600L\mm it is easy to built used duck tape to remouve the reflex coating of the cd ,clean it and...
Hi Olivier, That is an interesting little program(and good fun too!) I did a rough estimate on TZ Lyr and it seems the percentage contribution of the cooler...
Jacques, I believe this will still be too low resolution. But send us your spectra so we can see the results. Cordialement, Olivier ... Jacques, I believe this...
ok for the result I thing you have to waited a bit I am jam inside house because my broken leg for more mount and maybe I begin to experiment whit lhressII...
Jacques, Group in Strasbourg is Joachim Koppen... We had a great time together back in October in a spectroscopic week-end organised by CIACANE in East of...
Hi Michel, R=30 seems a bit low for the Star Analyser. Depending on seeing, I generally get around 60 when working at 12A/pixel with a 200mm f6.4 VC200L eg ...
it is exact http://astro.u-strasbg.fr/~koppen/spectro/spectrof.html#TOP was the web site and resumed the technic but from that it is possible to mouve to...
If you live south of about 48N then this is definitely an interesting target for the Star Analyser. It is now developing the classic strong Ha emission line. ...
And now I see we have another one in the same part of the sky! but unfortunately for me even further south :-( Robin "H. Yamaoka, Kyushu University, reports...
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