brownrb1

Hi, I've just started learning Demetra to reduce my data and get spectra profiles. I had previously posted a profile of Vega and, attached here, a profile of Beta Lyrae. In both cases, the wavelength of absorption and emission lines were off. What could I do to correct this? Thanks Dick

Vega (1) .pdf Hi, After correcting some glitches with my Alpy-Camera I imaged a spectrum of Vega the other night and got my Masters and calibration from Alpy calibration module. I think that I will enjoy using Demetra to do data reduction. Hopefully I will be out tonight and get spectra of various stars and use Demetra to get their profiles. Attached is a screenshot of the profile of Vega. Thanks Dick

Hi Olivier, Attached are 2 raw images-a 10 s expoure and a 60 s exposure. Both are from Shelyak calibration. Thanks Again Dick

Sorry-pressed wrong key-correct one was entered and can be seen above this one. Dick

I've been trying to learn how to use the ISIS program to do data reduction on my spectra and have been making some progress. When I get to PROFILE I get this profile (which is attached) of spectrum from my Alpy calibration lamp. I acquired the calibration spectrum using different exposures - 10s, 20s, 60s, and 120s. This profile is from 10s exposure, but they are all about the same. I use an Atik Infinity monochrome camera. The resolution of the profile is not what I expect. been

Hello Nicolas. I downloaded the newest Demetra program I moved 6 images of P Cyg from the other night that are good fits images. I the acquired my bias, darks, flats and calibration frames. I kept acquired calibration at different exposures. At 180 s and 10 s I would get no calibration profile when I checked 'calibration' and got a fairly good profile at 60 s, but then it noted that 'the process stopped while computing wavelength calibration'. Thanks Dick

Hello, I was loading my bias, darks,flats, and calibration. With the calibration I got a response "Information-failure o load required images for processing step eShelCalibX". I have an Alpy 600 using the standard 25 um slit, Alpy calibration module, Atik Infinity monochrome camera-90s fits exposure. Any ideas what the problem might be? I'm trying to figure out ISIS and Demetra. Thanks Dick

Hello Pierre, Thanks for response. I not quite sure what a "working directory" is. I have some files with spectra that I have captured and placed in folders-B Spectra, WR Spectra, etc. I then placed these files into a file named "Spectra" and then placed "Spectra" as my working directory. Clearly I'm not doing this correctly. Again Thanks Dick

Hello, I've just started to try and learn how to use ISIS-I have V5.9.3. For starters I have a fits image of Vega and a file on Desktop named Vega_06_29_2020 with that image. On SETTINGS I enter [Alpy 600(without calibration module)] and on WORKING DIRECTORY I find the file on Desktop and enter it. I then go to IMAGE and click on [SEARCH/File] icon, click on 'Vega_06_29_2020' and the spectrum appears on the screen, along with 'Vega_6_29_2020' in 'Image Name'. I then click on 'Display' and I get an error ' X file c:\users.... not found'. Any tips on what to do? Thanks Dick