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Last Post

Background subtraction from spectraStarted by:Francesca, 07/16/2014 10:23AM
Hi,

I am using the "background" task in iraf
to subtract the background from some 2d
spectra. I am using the task in
interactive mode because I would like to
change the fit windows along the
spectrum wavelength. This is what I do:
once the task is la...

1581

By: valdes

07/25/2014 05:31PM

Apall: Optimally extracted spectra do...Started by:stpjhj, 07/09/2014 07:15PM
Dear all,

I am trying to reduce a longslit
data(from SUBARU FOCAS, btw,) and I am
having some problem that I couldn't
understand.

When I invoke apall task with weight
option set to "none," resulting spectra
seems fine.
But if I set weight option ...

1333

By: valdes

07/25/2014 05:41PM

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

Spectroscopy - Wavelength Calibration...Started by:chewbacca, 07/17/2014 09:18PM
Hi,

I have a raw spectrum to which I want to
assign a wavelength solution (dispersion
function).
I know the standard way to do this is to
run identify on a lamp spectra to fit a
dispersion function, and then assign
such a file to the field REFSPEC1...

2853

By: valdes

07/25/2014 08:40PM

splot: deblending with constant redshiftStarted by:chewbacca, 07/27/2014 11:47AM
Hi,

I am using splot to fit doppler shift in
absorption lines that are very weak, so
I would like to take advantage of the
'single' option in the deblending
routine.
However, my lines are separated by ~150
nm so Delta(lambda) can vary quite a lot
be...

840

By: chewbacca

07/28/2014 07:44AM

Mosaicing Direct ImagesStarted by:ahkoeppel, 07/31/2014 07:12PM
Hey there,

I am working with image exposures made
up of 8 CCD frames and I have been
trying to create a master image from
several exposures in shifted regions
(which each have eight frames).

I was able to stack the images with
mscstack, but the ta...

1282

By: valdes

08/01/2014 04:27PM

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.......

736

By: fitz

08/03/2014 07:32PM

Multi-order text file to fits file fo...Started by:aturby, 07/27/2014 01:23AM
Hi! I am unfamiliar with manipulating
fits files in IRAF, and was hoping
someone could suggest a method that
could be used to convert a simple, but
very large, 3-column text file to a
multi-order fits file that will be
analysed in splot.

The text fil...

2295

By: aturby

08/07/2014 12:06PM

rvsao 2.8.1 problem in Mac OS XStarted by:chewbacca, 08/05/2014 01:06AM
I have the newest iraf 2.16.1 in Mac OS
X and rvsao 2.8.1 (installed through
'make rvsao' in /extern local folder).

When I run the command xcsao, I get the
error

ERROR: MWCS: coordinate system not
defined (logical)

Both the input spectrum and ...

1481

By: chewbacca

08/16/2014 12:10AM

rvsao MWCS errorStarted by:fitz, 05/28/2014 08:04PM

[color=red][Moderator's Note: Forwarded
from story posting][/color]

Hello,

I installed on a MAC (OS X 10.8.5) the
latest IRAF version (2.16.1) and the
rvsao 2.8 as external package with the
make rvsao in the extern directory.
When I try to run...

1610

By: fitz

08/16/2014 05:11AM

scombine with local snr weightStarted by:chewbacca, 08/17/2014 11:50AM
Is there a way to use scombine with the
weights in the overlap regions being the
local snr (signal to noise ratio)?

This is a fairly standard use and it
seems scombine doesn't support it...
what is the easiest way to do this in
iraf? I have a fairly ...

742

By: chewbacca

08/17/2014 11:50AM

noao.onedspec.hirescalStarted by:ircarrascal, 08/22/2014 04:50PM
I thought this task would be included in
v2.16, which I just installed, but I
can't actually find it. See Sect. 5
here:

ftp://iraf.noao.edu/iraf/v216/v216revs.txt

Any idea what's going on or how I can
get it to work?

Thanks!

Ivan

572

By: fitz

08/22/2014 07:46PM

which step lets iraf know the exposur...Started by:haha, 08/24/2014 12:09PM
For specral reduction,there is a
parameter 'exptime' in 'calibrate'. The
exptime is the exposure time of your
star or the standard star?

How does iraf know the exposure time of
your source and the standard star?

1402

By: haha

08/26/2014 02:48PM

scopy: wavelength range problemStarted by:chewbacca, 08/27/2014 07:51PM
I am using scopy to copy portion of a
spectra with starting and ending
wavelengths w1 and w2. The rebin
parameter is set to yes, so I would
expect w1 and w2 to be exact (the
spectra covers a region well beyond w1
and w2).

However, in some cases scop...

677

By: chewbacca

08/27/2014 07:51PM

how to dump the data of a spectrum go...Started by:haha, 08/26/2014 02:59PM
There is only one extension for a
spectrum fits file got by iraf.
However there are four parts including
primary, background...

Splot can display the spectrum with
wavelength and flux.

I tried to read the data of the spectral
fits file, but only ...

969

By: haha

08/29/2014 09:13AM

an iraf script problemStarted by:haha, 08/29/2014 09:25AM
How to write a wspectext script in
bash?
It is like:
$wspectext spectra.fits spectext

So there are two parameters now.

images
imutil
noao
onedspec
unlearn wspectext
wspectext.wformat="%0.2f"
printf ("wspectext ('%s', input='%s',
header...

2270

By: haha

09/01/2014 12:18PM

about the flux calibration of a spectrumStarted by:haha, 09/04/2014 03:49AM
when we run
apall

Automatically there is a size for an
aperture. That size is the FWHM or
something of the aperture? Or we can
choose the size of the aperture by
ourself?

If we choose by hand, the flux may
become arbitrary?

929

By: haha

09/04/2014 03:49AM

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

Imlintran: segmentation violation Started by:Lena, 09/19/2014 02:33PM
Dear colleagues,

please, help me to solve this problem. I
can upload sample files anywhere you
like is you need them.

[b]SYSTEM:[/b] x86_64 GNU/Linux
Xubuntu 14.04
[b]IRAF:[/b] PC-IRAF Revision
2.16.1
[b]BUG:[/b] Imlintran ᥿...

1118

By: fitz

09/22/2014 04:27PM

what are the general tasks like sextr...Started by:haha, 09/30/2014 12:51PM
I mean tasks in iraf.

859

By: haha

10/04/2014 01:34PM

Problems running ngaussfitStarted by:Francesca, 10/01/2014 01:37PM
Hi,

I am trying to run the task ngaussfit on
my mac osx 10.8.5 but it seems not to
work. After I launch the task,
I can see the the spectrum on the
graphic window (together with a
tentative fit below).
However, if I try to change the graph
window ...

1311

By: fitz

10/06/2014 02:55PM

splot deblending vs fitprofs Started by:chewbacca, 10/06/2014 07:29PM
Hi,

I am measuring broad spectral lines in
iraf, and the problem is that the
measurements with deblending in splot
and fitprofs do not match. I use the
same file as the input, and set the
sigma0 and invgain parameters to the
same value in both measu...

783

By: chewbacca

10/06/2014 07:29PM

Extracting lambda-flux values of fitt...Started by:Francesca, 10/15/2014 11:55AM
Hi,

I am fitting some spectral lines with
the deblend option in the splot iraf
task. Once the fit has been done, I
would like to save, together with the
fit parameters (e.g. FWHM,flux, etc,
which I get in the splot.log file), also
the "wavelength-flu...

800

By: Francesca

10/15/2014 11:55AM

merging Started by:giannicatanzaro, 10/16/2014 09:58AM
dear all

I have this question: how do I can merge
all the orders of an echelle spectrum in
a single spectrum?

thanks

Gianni

681

By: fitz

10/16/2014 10:46PM

Reducing OSIRIS/GTC data with irafStarted by:jadiazt, 10/01/2014 12:48AM
Hello,

I want to reduce OSIRIS/GTC data using
standard routines of IRAF. OSIRIS images
are composed of 3 layers, where the
first is the header and the reamaining
are the CCDs data. When I want to apply
ccdproc to the images, for example
images=image[...

1932

By: jadiazt

10/16/2014 11:38PM

Persistent sky lines when extracting ...Started by:cwbullivant, 10/18/2014 07:14AM
For the last few months I've been
working with spectra taken at the Bok
telescope at KPNO, and one particular
data set has been especially difficult
to reduce properly. The spectra for this
night are generally fainter than the
rest of the data that I've...

1739

By: cwbullivant

10/18/2014 07:14AM

nfit1d errorStarted by:donzelli, 11/25/2014 01:53AM
Hi, when I try to fit data in a table
using 'users' function I receive this
message: ERROR: Error in variable name.
I've done all I know, i.e.
unlearn the task, parameters, etc. The
task works fine with 'galprof' or
whatever function. You can see below...

1031

By: fitz

11/25/2014 02:51AM

Standard Star CalibrationStarted by:fitz, 11/25/2014 07:29AM

[color=red][Moderator's Note: Forwarded
on behalf of user][/color]

After weeks of intensive research I
finally managed to obtain a CMD of the
globular cluster M53 using B,V filters.
(See Attachment)
The magnitudes here are of course the
instrumen...

3071

By: fitz

11/25/2014 07:30AM

Constant value substitution for pixelsStarted by:sa14722, 12/11/2014 07:21PM
I'm new to iraf so please pardon me if
this is perhaps a silly question.

So I have an image which has a diagonal
region of bad pixels. I have created a
text file which contains a list of the x
and y positions of all these bad pixels.
I am trying to r...

1841

By: sa14722

12/12/2014 03:12PM

Error: task cosmicrays not foundStarted by:unixil_astro, 12/17/2014 02:54AM
hi, i have a problem in running
cosmicrays task, when i run "spa
cosmicrays", it says task "cosmicrays"
not found, and under ccdred i can't find
cosmicrays indeed.

should i run something like make latest
or things like that to fix the problem,
or i ...

1855

By: unixil_astro

12/17/2014 03:02AM

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