CCD Photometry with Pyraf

ASTR 3010

Useful Tutorials• IRAF Aperture Photometry Tutorial:

www.astro.washington.edu/courses/astro480/IRAF/iraf4_tutorial.pdf

• IRAF Beginner’s Guide:

http://iraf.noao.edu/iraf/ftp/pub/beguide.ps.Z

• IRAF CCD Reduction Tutorial:

http://iraf.noao.edu/iraf/ftp/iraf/docs/ccduser3.ps.Z

Photometric Reduction Project (20% of your final exam)• Your individual account was created in space.physast.uga.edu

isong@uga.edu 810-12-3456o userid: from your Oasis email address “isong”o passwd: temporary passwd 810123456 Upon 1st login, you will be asked to reset your password.

• CCD data are available in /home/astr3010/ImagingData

• BVI band photometric data with DOME flats, Sky flats, and Biases.• 3 standard star fields.

Standard Fields

• Check the “StandardFields.pdf” file in the data directory

Science Field (D42, D44, D45)• You need to measure B, V, I magnitudes (or upper limits) of following four

stars: A, B, C, D• Submit reduced FITS files and photometry result.• Due Date: Dec 2, 2010

A

B

CD

A Quick Tutorial on Pyraf

1. starting Pyrafmkiraf (only once) in your working directory choose ‘xgterm’type ‘pyraf’

2. editing, displaying, dumping parameters: epar, lpar, dpar3. start ds94. load packages in pyraf : imred ccdred and digiphotapphot5. some useful commandsimheadccdlist

6. setting up instrument efosc.cl, efosc.dat, subsets7. CCD preprocessing

zerocombine, flatcombine, ccdproc, badpixel image creation, etc.8. Doing an aperture photometry

qphot

Badpixel correction will be done by a separate python routine.