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Combining two spectra from two differ...Started by:rohit, 12/01/2009 05:31PM
I would like to combine two spectra
taken on the same instrument with the
same setup of the same star but at two
different epochs (particularly 5 months
apart). How do I combine them?

1976

By: fitz

12/01/2009 05:31PM

combining with scombineStarted by:rohit, 08/12/2008 02:41PM
I have a peculiar problem when combining
spectra with scombine. There are 4
spectra(call it orders) whose x-axis has
pixels which range from 0-1000 for most
spectra while the y-axis is normalised
flux. I would like to combine them such
that I have a spe...

2138

By: valdes

08/12/2008 02:41PM

compare observed and synthetic spectraStarted by:delta_kuadrant, 08/05/2009 06:40AM
Dear all

sorry for bothering you again^^
I have a synthetic spectra and I wanna
compare it with observed spectra from
echelle data.
I already transform observed spectra
into text/ascii file using wspectext,
and select a certain range of
wavelength.
how...

4722

By:

08/05/2009 06:40AM

compiling fortran programs within irafStarted by:amiravb, 07/08/2010 07:55AM
Can someone help me - I am trying to use
a fortran program that has previously
worked. The only difference is now I am
running it from my personal laptop. I am
compiling within iraf,and keep getting
the following errors?? e.g.
> fc program.f
program....

1908

By: amiravb

07/08/2010 07:55AM

Compiling fortran task on cygwin/winxpStarted by:iwold, 12/07/2006 06:26AM
Dear Mike,

Thank you for all your help. I am
trying to compile a fortran task named
photstand.f I am attempting to follow
procedures laid out in previous forum
topics with no success. This is what I
have done:

[code:1:c0f39aee2d]csh
>setenv ira...

8474

By: iwold

12/07/2006 06:26AM

composite spectrumStarted by:uros, 06/07/2017 08:13AM
Hi :)

first sorry if this question already has
been asked, I try to find did someone
ask this before but without success.

I am trying to create composite 1D
galaxy spectrum from 4 single 1D spectra
(different galaxies).
I know how to shift all sp...

1230

By: fitz

06/08/2017 01:53PM

computing error in EWStarted by:rohit, 04/27/2009 12:23PM
I use the SPLOT task to obtain the
equivalent width, however, IRAF does not
give me the precision or the error
involved in measuring EW. Is there
something I need to enable? How do I get
the error in EW?

Thanks,

1660

By: valdes

04/27/2009 12:23PM

conclude response taskStarted by:tneve, 08/08/2008 09:43AM
Hello!
I'm new at all this IRAF and Unix thing.

I'm running the task
[i:21ca87735d]response[/i:21ca87735d] to
obtain the normalized flat spectrum and
everything seems to be working well: I
edit the task with [i:21ca87735d]epar
response[/i:21ca87735d], ...

2501

By: valdes

08/08/2008 09:43AM

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...

1843

By: sa14722

12/12/2014 03:12PM

continuum of a spectrumStarted by:kwkchan, 12/07/2009 09:10AM
Hi Does anyone know how to find the
continuum of a spectrum with iraf?

2001

By: fitz

12/07/2009 09:10AM

contour plottingStarted by:Pawade Vishal, 01/02/2008 10:40AM
How can i plot new contour of nebula ?
let....i want to plot contour for
surface points (x,y) in magn/arcsec^2.
then How can I made the surface
magnitude image.?
& how can i fit the parameters ?

2035

By: fitz

01/02/2008 10:40AM

convert FITS file to ASCII table with...Started by:iraf_astro, 12/27/2015 08:16PM
Hi,

I have searched through IRAF to find out
a routine which would list out all the
pixels and the counts associated with
them for a fits image, but I could not
find anything. I would like to compare
my model image (with WCS coordinates) to
a real im...

2234

By: fitz

12/27/2015 10:08PM

convert FITS imageStarted by:sarahf60, 04/19/2011 12:08PM
I have some density contour FITS images
which I want to convert them to ASCII
file . is it possible to do it by
iraf?how?

2163

By: fitz

04/19/2011 12:08PM

Convert spectrum to velocityStarted by:malte, 12/17/2007 01:08PM
I want to transform a spectrum's
wavelength axis to velocity relative to
a specified spectral line.

Splot does this with its command v, but
I'm looking for something a bit more
like scopy. Scopy looks like it might
do the trick, but I'm not clear on...

4652

By: valdes

12/17/2007 01:08PM

converting *coo or *mag files into re...Started by:rebull, 12/08/2006 08:51AM
Hi -

I'm looking for an IRAF task that will
take the output of daofind or phot (or
for that matter txdump) and make a
regions file so I can overlay it on the
image in ds9. I've RTFM'd to no avail.
This must be something that every single
astronomer d...

2455

By: fitz

12/08/2006 08:51AM

Converting Fits file into ASCII formatStarted by:rohit, 10/31/2006 04:34PM
Hi All,

I have a fits file. It is actually a
spectra. When I use splot
<filename>.fits I get a plot of
spectra of an object which is normalized
amplitude (y-axis) versus wavelength
(x-axis). I would like to extract the
data, get two columns one ...

4832

By: rohit

10/31/2006 04:34PM

Converting fits file into data pointsStarted by:rohit, 06/01/2006 07:38PM
Hello All,

I would like to know a command or sets
of commands I need to use to convert a
fits file into data points for plotting.
Well, I have a plot Flux vs wavelength.
I would like to use IRAF to obtain two
data-point columns, Flux and wavelength,
s...

2998

By: fitz

06/01/2006 07:38PM

converting from .imh to .fitsStarted by:massey, 05/21/2007 01:38PM
Mike, et al---

Sorry to ask such a simple question, but
this one has been confused. I have
a bunch of old blah.ms.imh files, and
I'd like to convert these to fits
(blah.ms.fits). So I did the following:
files *%.imh%% > old
imrename @old//.imh @old/...

6895

By: massey

05/21/2007 01:38PM

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...

4153

By: tonisee

05/14/2008 08:57AM

ConvolutionStarted by:rrdecarvalho2009, 01/15/2009 01:11PM
Does anyone know how to convolve (in
iraf) a spectrum with a gaussian where
the FWHM varies with lambda ?

Reinaldo

3709

By: valdes

01/15/2009 01:11PM

coordinates from photStarted by:Angelap, 04/24/2011 11:31PM
Hello,

I am using noao->digiphot->daophot
to calculate the coordinates and the
magnitudes of several stars in an image.
I calculate the coordinate list using
daofind and I use the output list to run
phot and get the magnitudes. I noticed
that the...

1754

By: fitz

04/24/2011 11:31PM

copy headerStarted by:Alextreme, 04/25/2015 04:42AM
how can I copy all the headers from a
image to other image with IRAF?

1810

By: fitz

04/26/2015 01:01AM

Copying Headers in Mosaic1.1 FilesStarted by:RLBeaton, 05/27/2011 05:42PM
Hello,

On a recent KPNO+Mosiac1.1 run, many of
my exposures did not have headers. I
have been attempting to copy the header
from one file to the pixels for another
file and then edit the required fields
with mscred.ccdhedit

My first attempt was to us...

2410

By: valdes

05/27/2011 05:42PM

Correcting Row Offsets?Started by:joshw, 01/29/2006 10:23PM
I've got some images which suffer from
time variable noise which offsets each
row of pixels by a small amount from the
rows above and below it. The noise can
be corrected in most cases by adding a
small offset to each row such that the
median of the ro...

6398

By: joshw

01/29/2006 10:23PM

Cosmic ray removalStarted by:Guest, 10/10/2005 09:16PM
[b:3401995173]From:
[/b:3401995173]mansie
<mansie@astro.indiana.edu
([email]mansie@astro.indiana.edu[/email])>
[b:3401995173]Date:
[/b:3401995173]October 10, 2005 7:23:43
AM MST
[b:3401995173]To: [/b:3401995173]Frank
Valdes <valdes@noao.edu ([e...

3179

By: Guest

10/10/2005 09:16PM

cosmic ray removal helpStarted by:mnicholls, 11/25/2013 03:06PM
I'm very new to IRAF and need to remove
Cosmic Ray hits from my spectra (all
spectra are saved as .fits files and
therefore come in both 1 and 2
dimensions, with various amounts of sky
subtraction, but I'm sure this is a well
known aspect to all you exp...

3708

By: fitz

11/26/2013 05:25PM

Cosmic RaysStarted by:Nishkin, 07/04/2006 03:03PM
Hi all,
I seem to have a problem when I
want to remove cosmic ray. I use the
task cosmicrays but it seems not the
remove much...I do not run the task
interactively since I do not understand
much what to do in there.
I know they are cosmicrays and...

2716

By: fitz

07/04/2006 03:03PM

Cosmic Rays and apall extraction of l...Started by:lchomiuk, 02/24/2010 04:14AM
I'm extracting some rather low
signal-to-noise spectra with apall, and
I've noticed that cosmic rays (either on
the source spectrum or in the background
region) have a very strong and
distorting effect on the extracted
spectrum. I get large narrow spike...

2853

By: valdes

02/24/2010 04:14AM

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!

4345

By: mdg

11/04/2007 04:22PM

cosmicraysStarted by:dbrenner, 09/02/2008 07:28PM
The following script works

#!
/scisoft/all/packages/iraf/irafbin/bin.macintel/cl.e
-f

noao
imred
crutil
printf ("cosmicrays input =
DARKS/DARK_D_71.fits[1] output =
/Users/dsb/DATA/1.1.1/Processed/tmp.fits
interactive = no\n") | cl()

logout

but this...

2091

By: valdes

09/02/2008 07:28PM

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