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Daophot/PSF problemStarted by:jimbojones, 09/27/2008 08:04PM
I have a quick search and can't seem to
find anything like the odd problem I am
having with the PSF task in daophot.

Initially I was trying to create a PSF
from 500 stars which I had done fine at
work using PYRAF. Having finally got
IRAF working on my...

1684

By: fitz

09/27/2008 08:04PM

DAOPHOT/psf - sampling interval of re...Started by:ameisner, 10/04/2008 12:12AM
I know that when DAOPHOT/psf creates a
PSF, the residual table has twice the
sampling interval of the actual data
used to create the psf. Given that
generally a large number of stars are
used to create the psf, it seems like it
would be reasonable to ex...

1705

By: valdes

10/04/2008 12:12AM

daophot.addstar problemStarted by:gruntle, 02/23/2006 08:48AM
Hi,
I'm using addstar in the daophot package
to simulate stars (based
on a psf model computed with the psf
task).

The task runs ok, I get no error
messages and the resulting
simulated images look nice. I'm adding
~1000 stars to a
~2000*2000 pixel im...

4866

By: phil

02/23/2006 08:48AM

DAOPHOT standalone to DAOPHOT/IRAFStarted by:jchavez, 04/05/2011 04:28PM
Hi,

I have run DAOPHOT, the stand-alone
version to get instrumental magnitudes.
I am now trying to calibrate the
standard stars as detailed in sections
3.6 to 3.10 of "A User's Guide to
Stellar CCD Photometry with IRAF".

I have created the imsets f...

1489

By: jchavez

04/05/2011 04:28PM

DAOPHOT Stand aloneStarted by:markgallaway, 04/15/2008 09:35AM
Does anyone have a link for the
downloading of the standalone version of
DAOPHOT for the Mac.

Thanks

2075

By: fitz

04/15/2008 09:35AM

DAOPHOT recenter optionStarted by:shalyapin, 04/23/2007 01:51PM
Dear all,

Standard version of DAOPHOT includes two
possibility to recenter star positions
during fitting: 1) when we turn on the
option "recenter=yes" positions of all
stars are fitted; 2) in the case
"recenter=no" all positions are kept
fixed at their...

2712

By: valdes

04/23/2007 01:51PM

daophot psf does not write the psf im...Started by:vrooje, 09/16/2008 01:04AM
Hi,

I need to make about 200 PSFs for
individual images. I have, in the past,
successfully used the following sequence
to create PSF images in
noao.digiphot.daophot:

phot -- starting with just a list of
star positions
pstselect
psf
seepsf

All this wo...

2656

By: valdes

09/16/2008 01:04AM

daophot parameter for # of frames in ...Started by:ameisner, 06/02/2009 05:28AM
I am using IRAF/daophot to build a PSF
for an image that is a median-combined
version of a number of exposures.
Currently I have the datapars parameter
"noise" set to "poisson" and have set
"gain" and "readnoi" to the values
appropriate to the camera u...

2438

By: valdes

06/02/2009 05:28AM

Daophot - convert pixel values to ra ...Started by:phy2j2s, 04/30/2009 01:44PM
Hello,

I am not the most experienced user with
iraf so sorry if this is very basic.

I have performed my own photometry on a
fits file using Daophot (IRAF v2.14.1)
following the IRAF/DAOPHOT package
reference guide by Lindsey Davis.

I have reached the...

1803

By: fitz

04/30/2009 01:44PM

daopars.mergerad problemStarted by:fitz, 06/29/2014 02:29PM
[color=red][Moderator's Note: Forward
from story posting][/color]

I'm running a script to perform psf
photometry on a series of images. Doing
this I don't want stars to be merged.
Therefore I set daopars.mergerad to 0.0
but stars still get merged?...

1514

By: fitz

06/29/2014 02:29PM

daofind seems to be ignoring search p...Started by:bwp, 06/26/2007 06:28PM
I am having some difficulties with
[i:a4e1593db1]noao.apphot.daofind[/i:a4e1593db1].
As I understand it, the main parameters
that determine how many objects I detect
are "sigma" and "fwhm". However, I get
the same number of objects using sigma=4
as sigm...

4823

By: GalacticKitten

06/26/2007 06:28PM

daofind problemStarted by:GalacticKitten, 08/02/2010 03:33PM
Hi, I'm trying to run daofind on some
images with a large field of view.
However it is returning way too many
stars regardless of how I set my
parameter files. It also doesn't seem to
matter what I have my detection
threshold set to, it still detects pr...

2486

By: GalacticKitten

08/02/2010 03:33PM

daofind interactive display device errorStarted by:Santiago, 11/23/2008 06:50PM
Hello, I'm trying to make an interactive
daofind routine and there is an error
regarding the display device, can't copy
and paste so i write down:

apphot> daofind
Input image(s) (Fy080826.0046.fits):
Warning: Error opening graphics device
Warning: G...

4979

By: fitz

11/23/2008 06:50PM

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...

4073

By: dee_kaee

06/19/2007 05:19PM

daofind errorStarted by:Santiago, 10/06/2009 02:27AM
i'm running daofind and i get the
following error message:

ERROR: Cannot open pixel file (denXXXXa)

where XXXX is a number not always the
same... like 9636 or something like
that...

Images are taken with a SBIG CCD camera
and the default Header is no...

1958

By: Santiago

10/06/2009 02:27AM

Dangers of cosmicrays task?Started by:Sean, 07/30/2007 07:19PM
Hi,
I am reducing about 500 images taken
with the Johns Hopkins Adaptive Optics
Coronagraph on the Palomar 60 telescope.
Most of the images have between a 500
and 1000 second integration time, and,
thus, have quite a lot of cosmic ray
hits. In order...

2487

By: valdes

07/30/2007 07:19PM

Cutting emission linesStarted by:mv1612, 05/31/2006 03:52PM
Hi,

My first post here, if it is elementary
I apologize, I just began learning IRAF.
I'm working on some very high resolution
spectra of a WR star. I need to cut the
upper part of an emission line cause I
would use the wings only for
cross-correlation,...

3253

By: mv1612

05/31/2006 03:52PM

Curved arc lines on echelle spectraStarted by:pskoda, 01/22/2010 02:07AM
Hi all!

At certain echelle instruments (e.g.
X-shooter, ESPADON or our OES) there is
a problem with the tilt of the arc lines
which are not prependicular to the
central line of an echelle order but the
tilt is changing along the order as
well. IN the w...

7478

By: valdes

01/22/2010 02:07AM

ctio.immatchStarted by:kanaan, 04/04/2008 10:52PM
Hi folks,

I am getting:

"Bad file name template descriptor "

when I leave ctio.immatch

immatch seems to run fine, I am running
it interactively and it is all fine.

I R A
F
Image Reduction
and...

2573

By: kanaan

04/04/2008 10:52PM

CTIO Y4K CCD reduction questionStarted by:Santiago, 08/20/2008 02:20AM
Hello, I'm Santiago Roland and im going
to the Yale 1.0m telescope in CTIO in a
couple of days.. to do some TNO
Photometry.... I read the Y4K cam
reduction intructions by Massey and i
was wondering if all this reduction can
be done in the binned 2x2 mod...

3110

By: Santiago

08/20/2008 02:20AM

ctio 4m ccd for echelle spectroscopyStarted by:Guest, 02/21/2007 09:28PM
Dear IRAF Help Desk,

I am trying to reduce CTIO-4m/echelle
data, but can't
find any IRAF task to do so in ctio
package.
The chip has two amplifiers, therefore
two trim sections
and two bias sections. I can't use
ccdproc for this
dataset. Is there any...

2838

By: fitz

02/21/2007 09:28PM

crosscor finds zero shift for shifted...Started by:kanaan, 11/19/2007 10:58PM
Hi folks,

I have used crosscor
(stsdas.analysis.fourier) for ages in my
high speed photometry package to track
moving fields of stars. I only use it
when using the previous position or
immatch (from ctio) fail. Crosscor is a
lot slower, but it never ...

3056

By: valdes

11/19/2007 10:58PM

Cross talk issues with WIYN MINIMO.Started by:tsaab, 06/14/2011 09:13PM
I was following the standard reduction
process for photometric data when I
found that my sciences frame had a lot
cross talk. I was wondering if there
exist any cross talk correction files
for WIYN MINIMO?

2082

By: fitz

06/14/2011 09:13PM

Cropping .fit files?Started by:nwj781, 07/08/2008 05:37PM
How can I crop down a .fit file
containing roughly 50,000 stars to a
300x300 pixel image? I was told that
ccdproc's trim function could do it, but
it only appears to trim the bias section
of the image.

Cheers,
Neil

6904

By: nwj781

07/08/2008 05:37PM

crnebula: how can i set ncsig/nlsig ??Started by:mikewong, 09/01/2009 02:24AM
hello,

i've used crutils.crnebula before with
good results, and now i'm working with
data that have a "nebula" with a bimodal
brightness distribution. i think
crnebula could handle this without
rejecting my "nebular" structure, if
only i could get it t...

1613

By: mikewong

09/01/2009 02:24AM

Creating those pretty multicolor pict...Started by:jcely, 10/24/2009 04:25AM
Are the "photogenic" multicolored
pictures created in iraf? Or do people
just go to external software like
photoshop or gimp for that?

4575

By: jcely

10/24/2009 04:25AM

Creating mosaics using WCSStarted by:kstassun, 11/27/2006 05:59PM
I am trying to figure out the best way
to create a mosaic from several fits
images (they are 2MASS images downloaded
from IRSA). The images already have
complete WCS headers so I don't need to
determine a plate solution or match
objects to astrometric c...

2854

By: fitz

11/27/2006 05:59PM

creating masks in IRAFStarted by:rohit, 04/03/2008 09:58PM
I would like to create a mask using one
of our spectrum of a template star.
Basically instead of having fine lines,
I would like to have square blocks,
which make up the spectrum. How do I do
that in iraf?

I also have a dat file of the spectrum
in addi...

3493

By: fitz

04/03/2008 09:58PM

Creating lists from header infoStarted by:Duncan, 05/19/2010 09:14PM
I have been trying to make lists of
object images, bias images, and skyflat
images so I can run batches. I have
been having issues making lists quickly
using the header information. Is there
a way to sort and/or create a list from
information from the...

12753

By: fitz

05/19/2010 09:14PM

creating a spectrum file that DEREDDE...Started by:davy, 10/17/2007 01:12AM
I'm trying to convert a near-infrared
spectrum from the SpeX instrument on
IRTF so that I can (de)redden it using
the task DEREDDEN. I have an ASCII text
file of the reduced SpeX spectrum, and
I've converted it two different ways for
IRAF ingestion:

(1...

3051

By: fitz

10/17/2007 01:12AM

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