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Last Post

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 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 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 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 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...

1488

By: jchavez

04/05/2011 04:28PM

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...

4865

By: phil

02/23/2006 08:48AM

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/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

Dark corrections and ccdprocStarted by:Guest, 01/21/2009 04:51PM

I have several light images taken at
different exposure times. I would like
to simplify my life and take only one
set of long exposure dark images and
scale them to the different light image
exposure times. When imaging lights, I
also take a set of...

1737

By: Guest

01/21/2009 04:51PM

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...

4262

By: jturner

03/11/2011 05:43PM

data from spectrum to textStarted by:andreas, 06/03/2010 12:41PM
hi all,

i have several spectrum (after dispcor)
with gaussian profile. i need to convert
it into data text, i try to say that i
want to display in text file instead
spectrum (image file), so i can get
detail. How can i do that?

Any help would be appre...

4937

By: fitz

06/03/2010 12:41PM

Database entryStarted by:Guest, 08/31/2010 06:29PM
Dear Sir:
Would you please entire our observatory
on your
database? Thank You.

observatory = "jcdo"
name = "Jack C. Davis
Observatory, Western Nevada College"
longitude = 119:47:26.4
latitude = 39:11:08.6
...

1076

By: fitz

08/31/2010 06:29PM

deblending by splotStarted by:owen, 03/25/2008 04:31AM
Dear Mike, and anyone else,

I use SPLOT to measure blended emission
lines in 1-D spectrum. But I faced with
this case. After typing d key, I am
asked "fit positions (fixed, single,
all, quit)?" and "fit Gaussian widths
(fixed, single, all, quit)?". I d...

1858

By: fitz

03/25/2008 04:31AM

Deblending with splot -- fixing wavel...Started by:chewbacca, 08/03/2014 08:47AM
In fitting multiple Gaussian profiles in
splot or fitprofs, is there a way to fix
one center wavelength and let the others
vary? There appears to be only the
options of fixing all wavelengths,
shifting all wavelengths or letting all
wavelengths vary.......

737

By: fitz

08/03/2014 07:32PM

Deblending with splot using input fil...Started by:chewbacca, 07/24/2014 09:06PM
Hi,

If I want to use a file to specify
wavelengths, widths, fluxes etc for the
lines I am trying to fit with the
deblending 'd' routine in splot, in what
order should I list the information in
the file e.g.

wavelength1 flux1 g fwhm1 eqw1 ...
wav...

1139

By: chewbacca

07/25/2014 08:06PM

Delays with 'mscdisplay'Started by:pakzad, 05/22/2007 04:47PM
When displaying mosaic images in ximtool
using 'mscdisplay', I have noticed it
takes a long time for it to calculate z1
and z2 (~5 seconds). It also seems to
take awhile to display the entire mosaic
(~10 seconds). When I attempt to
overlay a bad pixel...

2167

By: fitz

05/22/2007 04:47PM

Deleting points in the wavelength cal...Started by:cosmologist, 09/12/2011 04:42AM
In the data reduction manuals when
talking about the wavelength calibration
step, it is mentioned that when doing
the fit, if some points are really far
away from the horizontal line one should
simply delete them... but I don't
understand what that mean...

2598

By: favilac

09/12/2011 04:42AM

determination of equivalent widthsStarted by:Guest, 10/04/2006 03:55PM
Dear Sir or Madam,

my name is Martin Tafelmeyer, I am a PhD
student at EPF Lausanne. I am using
IRAF to determine equivalent widths of
spectral lines for metallicity
determination.
To automatize the procedure I created a
cursor file containing the line...

11274

By: starburst84

10/04/2006 03:55PM

Determining radial velocity with IRAFStarted by:valdes, 09/05/2007 08:49PM
[b:5e31dc4ee8]From:
[/b:5e31dc4ee8]"Roberto Madeira"
<rtmadeira@gmail.com
([email]rtmadeira@gmail.com[/email])>[b:5e31dc4ee8]Date:
[/b:5e31dc4ee8]August 30, 2007 1:44:04
PM MST
[b:5e31dc4ee8]To:
[/b:5e31dc4ee8]fvaldes@noao.edu
([email]fvaldes@noao...

4620

By: valdes

09/05/2007 08:49PM

differential photometry problemStarted by:ozbasturk, 06/18/2008 09:03PM
Hi all,

I'm trying to do differential photometry
on some 500 frames. I used daophot
package phot task to do the aperture
photometry and get the results in mag.1
files. Files contain the magnitudes of
both the variable and the comparison
stars. Now the...

5770

By: fitz

06/18/2008 09:03PM

Difficulty with reidentifyStarted by:Patrick Watson, 02/28/2022 06:51AM
Hello from a lone IRAF user,
I have a spectrograph susceptible to
flexure caused by temperature changes
and gravity. The calibration lamp is
internal to the spectrograph and hence
any shift between calibration images can
be sheeted home to the spectrog...

1346

By: Patrick Watson

02/28/2022 06:51AM

DIFIMPHOT again.Started by:mairan, 08/28/2006 02:53PM
Hi.

I'd like to know whether someone knows
how to use the DIFIMPHOT package.

Cheers,
Mairan Teodoro

2686

By: mairan

08/28/2006 02:53PM

DIFIMPHOT.Started by:Guest, 08/17/2006 01:14PM
Hi!

I'd like to know whether the IRAF's
library needs to be upgraded to run the
DIFIMPHOT package. I have installed this
package in my laptop but when I start
the GETPSF task it begins to run but
ends with an error, which I don't know
how
to solv...

6492

By: mairan

08/17/2006 01:14PM

digiphot photcal fitparams segmentati...Started by:jthorstensen, 07/08/2011 06:34PM
Hi (Mike, probably),

I have a newly installed IRAF 2.15.1a.
I'm trying to run fitparams, and getting
a segmentation violation. In the
discussion with marblestation dated
April 18, it looked as if you'd found a
bug that produced this behavior, but
the...

1913

By: fitz

07/08/2011 06:34PM

disp with ds9 shows only a 500x500 cl...Started by:kostja, 07/28/2008 04:53PM
Hello!

Today I installed iraf linux binary
v2.14 distribution, x11iraf linux binary
distribution 1.3.1 with the patched
redhat binary of gxterm and the 5.2
linux binary of ds9.

If try to view a fit image using disp,
ds9 shows only a 500x500 clipping o...

2103

By: fitz

07/28/2008 04:53PM

dispcorStarted by:adnan, 09/02/2014 11:02AM
Hi,
I'm having problem using the 'dispcor'
function on iraf.
I have installed the latest ximtool and
iraf version on a 64-bit Linux OS.

When I type 'dispcor' in an xgterm
window, it asks me give the Input and
Output spectra list. When I enter both
...

1247

By: adnan

09/15/2014 04:00PM

DISPCOR and echele spectraStarted by:karsten brogaard, 04/02/2007 12:40PM
Hi,

I am reducing echelle spectra with
simultaneous thorium argon next to each
target order. The problem is that some
of the thorium argon lines are so bright
that they interfere with the taget
spectra. Therefore I need to know where
in wavelength spac...

2531

By: valdes

04/02/2007 12:40PM

DISPCOR and nfit1dStarted by:Sparkles, 10/08/2010 04:15PM
Hi,

I'm attempting to bin my data, calculate
the standard deviations and see how well
it fits. I've been on it for a while and
a bit stuck. My plan so far:

Binned data is fine

step 2 - from the mean values of the 16
points I need to calculate the st...

2897

By: valdes

10/08/2010 04:15PM

Dispcor helpStarted by:valdes, 04/28/2010 03:10PM
Hello Peter,

Use the slist task. You can select a
single aperture and pipe the output to
scan or you can dump the information
into a file and then a loop over each
line of the file.

For the SNR I assume you mean finding
the mean and rms of the conti...

1870

By: valdes

04/28/2010 03:10PM

dispcor not working with ecidentifyStarted by:astronick, 05/29/2009 01:26AM
Hello all,

I'm trying to reduce some echelle
spectrograph data, but I'm hitting a
problem applying my wavelength solution
using DISPCOR.

I've identified the ThAr lines using
ECIDENTIFY, and got a good solution for
all the orders. I applied this to a t...

1402

By: astronick

05/29/2009 01:26AM

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