Has any here had a problem posting their processed jpegs (spectra) to Yahoo? We get a message "unsupported image file" ? So far as anyone knows our files are...
Hi Jerry, Can't say I have noticed a problem. One thought - do they have the file extension .jpg or .jpeg. I have a program which is happy with .jpg but will...
it is possible to see the comet in day time in nrth america for the moment in south it is the best place ok BUT 1-if you place you in the shadow of the sun 2-...
Hi Jack, The comet is way below the horizon now from the UK even in daylight. It might be possible to get a spectrum in a bright daylight sky. A setup using a...
Hi, As a new member of group I tried star analyser filter, took some images about their spectra and combined them in a single frame. You can see the image in...
some new camera have pixel of 2.8 micron and the other average at 10 micron dos this can change somthing in our experiment waht do you thing about that jacques...
Hi Jacques, The Star Analyser will work fine with any pixel size camera. In general for astro work it is good to try to match the pixel size to the seeing and...
Hi Mehemet, I can see some Hydrogen Balmer lines in Sirius and both show the atmospheric line in the red very clearly. Have you tried Betelgeuse? It shows some...
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...
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