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Sky flatsStarted by:cosmologist, 03/01/2011 01:30AM
In the manual I am following it says
that skyflats when combined should be
scaled by "mode", but my skyflats have
different exposure times, can I scale
them by exposure time instead? (both
exposure time AND mode are different how
do I deal with such a c...

4075

By: dschumac

03/01/2011 01:30AM

daofind floating point divide by zeroStarted by:dee_kaee, 06/19/2007 05:19PM
I can not get daofind to work. Everytime
I run it I immediatley get a "floating
point divide by zero error." I have used
it before with and without this error
occuring but this time I can not seem to
get around it. It does not seem to
matter what parame...

4076

By: dee_kaee

06/19/2007 05:19PM

Saludos desde Colombia!Started by:Guest, 10/11/2005 11:11PM
Estimados amigos
Reciban un muy cordial saludo de mi
parte. Yo soy estudiante de física y me
encuentro en este momento realizando un
trabajo de astrofísica campo en el cual
voy a especializarme.
Estuve realizando los primeros calculos
de mi trabajo ...

4092

By: Guest

10/11/2005 11:11PM

software problemStarted by:Guest, 11/04/2005 07:47PM
Hello Claudia,

The situation gets a little confused
because of different versions of
XImtool and DS9 that people use. The
cursor readback depends on
certain behaviors of the display
servers. It is likely you are using
DS9 which does not correct...

4094

By: fitz

11/04/2005 07:47PM

Which application should I use?Started by:mnicholls, 02/11/2014 01:57PM
I have a number of spectra which all
contain the same two Oxygen-III lines.
These lines should NOT show changes in
the value of the center wavelength and
the flux (i.e they should remain
constant across all spectra), however
some peaks have for some unk...

4116

By: fitz

02/11/2014 06:52PM

preserving WCS info while using imcopyStarted by:rawat, 02/14/2007 07:40AM
Hi all,
does anybody know whether the WCS
information of the original image is
preserved while using imcopy to carve
out a section of the original image? Eg.
If I have a 2048*2048 image with full
WCS solution present in the header of
the fits file, and ...

4123

By: valdes

02/14/2007 07:40AM

invalid image sectionStarted by:Guest, 12/12/2005 07:14AM
Hi,

I've been using the ellipse task in
isophote in stsdas for a while
successfully at the CfA. After not
having used it for maybe a month
and a half, I've run into problems
running the scripts or any task in
ellipse. I get the message,

ERROR on...

4124

By: Guest

12/12/2005 07:14AM

problem with :.snapStarted by:Myrddin, 11/04/2013 11:12AM
Hi

I'm having trouble making hardcopies
with :.snap. I use the tool igi in
stsdas package to plot the spectra in
three windows. When i try to make the
hardcopy i get this:

igi = gcur
# to get into the display command ...

4131

By: fitz

11/23/2013 08:16PM

flux calbrate spectraStarted by:, 08/14/2008 04:56PM
Hi,

I want to flux-calibrate spectra using
noao.imred.kpnoslit package. When I look
at onedstds$README, I only see
ctioextinct.dat and kpnoextinct.dat
files available. I didn't observe at
either ctio/kpno, but my standard star
is in the onedstd$spec16...

4133

By:

08/14/2008 04:56PM

DS9 command lineStarted by:ovince, 05/18/2006 06:44AM
Hi All,

I would like to lunch DS9 with 2 images
to have in the same time for analysis
using command line. Could somebody help
me with this

Thanks
Oliver

4141

By: ovince

05/18/2006 06:44AM

Error in dark subtractionStarted by:Lorrie, 02/02/2006 07:21PM
I've just started learning to use IRAF
to process images. Everything was
working fine until I tried to perform a
dark subtraction with ccdproc. I got the
error message "HDMGETR: No value found"
and for the life of me I can't figure
out what's wrong. Thi...

4145

By: fitz

02/02/2006 07:21PM

temden task problemStarted by:Guest, 02/14/2006 04:57PM
Hello,

I have a problem with the iraf task
temden in stsdas.analysis.nebular. The
density calculation works fine but the
temperature calculation always fails
after 2 iterations, even after trying it
with carbon I, sulfur II and nitrogen
II. Typica...

4153

By: shaw

02/14/2006 04:57PM

Converting new type DATE-OBS to UTStarted by:tonisee, 05/14/2008 08:57AM
Hello!

In the headers of my FITS files, only
DATE-OBS keyword in the new format is
presented, it is already in UTC, e.g.:
DATE-OBS = '2008-05-14T08:57:00'

Since many tasks need keyword UT, it's
probably most easiest to write small CL
script which pars...

4161

By: tonisee

05/14/2008 08:57AM

fxcorStarted by:rohit, 01/04/2008 12:20AM
I am trying to find radial velocity
using FXCOR. I give it the target fits
file and the template star fits file. I
then use the command " :tempvel 34.7 "
without the quotes to give fxcor the
template star velocity. It simply does
not take that but ins...

4174

By: fitz

01/04/2008 12:20AM

problem with noao.twodspec.longslit....Started by:danila, 08/08/2006 10:21AM
Hello everybody!

Please help!

I reduce 2D spectral data. I have been
correcting my data for geometrical
distortions. I run identify then
reidentify and get the database files is
needed for fitcoords. At first sight,
database files generated by ide...

4177

By: danila

08/08/2006 10:21AM

fxcor double precisionStarted by:orsola, 03/15/2007 08:12PM
I found some old e-mail advice on using
fxcor which indicated that the fxcor
within IRAF is not good enough and one
should mail Mike Fitzpatrick about
getting the double precision package. Is
this so? I have a version of fxcor in my
newly installed iraf...

4199

By: fitz

03/15/2007 08:12PM

problems with esoselectStarted by:cthoene, 01/19/2009 05:55PM
Hi,

I want to do some simple pipeline for
datareduction and need to sort the files
for e.g. the filter name. In ESO data,
this is stored in the IRAF nonconform
way of using headers names with spaces
("HIERARCH ESO blabla.."). I finally
found the progra...

4204

By: fitz

01/19/2009 05:55PM

Questions about read out noise and gainStarted by:lina, 03/26/2009 07:03AM
Hi, everyone

During my work with IRAF, I find that

In Zerocombine or Flatcombine task,
there are:
(rdnoise= ) ccdclip: CCD
readout noise (electrons)
(gain = ) ccdclip: CCD
gain (electrons/DN)

But in Apall task, there a...

4213

By: valdes

03/26/2009 07:03AM

ERROR: floating point invalid operationStarted by:johannes1808, 08/06/2010 05:06PM
Hi,

I have a question about the task
craverage of the imred/crutil package.
Whenever I use the task craverage in a
script the following error occurs
sometimes:

ERROR: floating point invalid operation
cl ()

Here is an example code:

int n
for(i=17...

4230

By: fitz

08/06/2010 05:06PM

about dispersion axisStarted by:valdes, 01/10/2006 06:24PM
[b:ec1587df6e]From:
[/b:ec1587df6e]"Janaka Adassuriya"
<adassuriya@accmt.ac.lk
([email]adassuriya@accmt.ac.lk[/email])>
[b:ec1587df6e]Date:
[/b:ec1587df6e]January 9, 2006 3:50:24
AM MST
[b:ec1587df6e]To: [/b:ec1587df6e]"Frank
Valdes" <valdes@no...

4239

By: valdes

01/10/2006 06:24PM

Spectra smoothing and save it into an...Started by:delta_kuadrant, 08/05/2009 12:15AM
Dear all

I've tried to search the forum and still
not find the answer.
I want to smooth my echelle spectra and
save it into another file. what task I
should use? I've tried the 's' keystroke
on splot and use 'i' to save it into
another file. but when I...

4255

By: fitz

08/05/2009 12:15AM

Data cube co-add problemStarted by:westmoquette, 03/11/2011 05:43PM
Here's a really tricky one (I think)...

I have two IFU datacubes that I want to
co-add together. They were observed on
different months, so have different
geocentric velocities and differential
atmospheric refractions (DAR), and are
dithered by 1 integ...

4265

By: jturner

03/11/2011 05:43PM

geomap/geotranStarted by:dbrenner, 04/10/2007 07:04PM
I generate a database map.txt using
geomap. Then geotran tells me it can't
find it. ERROR(1, "Database record not
found")

4269

By: dbrenner

04/10/2007 07:04PM

echelle.apnorm: PANIC in x_apextract....Started by:leon, 06/17/2009 08:12AM
I'm trying to normalize the flat under
PyRAF, but I got the following error
message:
[code:1:75b63215ee]
--> noao
--> imred
--> echelle
... ...
--> apnormalize
List of images to normalize: flat_b
List of output normalized images:
fla...

4274

By: leon

06/17/2009 08:12AM

timing with fxcor and rvcor (and setj...Started by:sdb_mike, 06/01/2007 04:40PM
I am doing time-series spectroscopy
measuring pulsation velocities using
fxcor. As such, our timing is incredibly
important. I have 2 issues related to
this:
The txtonly output of fxcor provides
time in HJD. However, I want JD output
because then I will...

4286

By: sdb_mike

06/01/2007 04:40PM

ccfind segfaults with ZPN projectionStarted by:evert, 01/23/2008 12:07PM
I get the following segmentation fault
with ccfind when using it on an image
with a ZPN projection:

Input File: obj.coords Output File:
new.coords
Image: wcstest2.fits Wcs:
Insystem: j2000 Coordinates: equatorial
FK5
Equinox: J2000.000 Epoc...

4287

By: fitz

01/23/2008 12:07PM

setairmass and psfStarted by:patB, 10/31/2006 07:27PM
hi there, I posted a topic a couple
weeks ago with a pretty vague (sorry)
question regarding setairmass and the
psf. The subject title was "Psf and
Setairmass," so the original thread is
there. I havent got another response,
so i thought i'd create a...

4313

By: azangari

10/31/2006 07:27PM

Trimming Fits image in ds9Started by:bedosti, 06/21/2007 09:33PM
Is it possible to trim a fits image in
ds9? I have a large image and I need to
produce a new one, containing only a
part of the original.

Any help would be appreciated.
Thank you
Bedosti

4333

By: fitz

06/21/2007 09:33PM

fit1dStarted by:curiousbutton, 04/05/2006 05:17AM
Hi - I'm trying to use the
images.imfit.fit1d package to fit a
function to 1 dimension of a 2d image -
and it appears to work very well,
throwing up an irafterm displaying the
fit. The helpfile advises to 'q' out of
the irafterm and then 'return' to cr...

4337

By: curiousbutton

04/05/2006 05:17AM

Cosmic rays and spectraStarted by:kafeen, 11/04/2007 04:22PM
Does anyone know if there's a particular
cosmic ray removal package that's really
good at removing cosmic rays from
spectra? Thanks!

4347

By: mdg

11/04/2007 04:22PM

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