Suppose that we want to create a folder in which multiple users will have full access (which means that they will be able to read, write, and execute). We create the folder (under ‘/’ in this example, although it can be anywhere else): sudo mkdir test which has the following …
… and the start of a new chapter after the successful defense of the PhD on September 18th, 2014!
Since August 1, 2014, I have started working in the Stellar Physics Department of the Astronomical Institute of Academy of Sciences, in Czech Republic, with Michaela Kraus. I will contribute to the investigation of the mass-loss history of some massive beasts out there (Luminous Blue Variables, B[e] supergiants, yellow hypergiants) …
Among the simplest installation methods to install IRAF are SciSoft (for RedHat/Fedora based distributions) and Fernando Avila Castro iso files (for Ubuntu/Debian based distributions). However, both require root privileges. What can you do when you do not have these permissions? Ureka [1] comes in rescue! It is easy to install …
Fast and easy conversion of a .reg file with image coordinates (x,y positions) to sky coordinates (RA,Dec;sexagesimal): ds9 image.fits -regions load input_imageCoordinates.reg -regions system wcs -regions skyformat sexagesimal -regions save outout_skyCoordinates.reg -exit with automatic exit of the program! Thanks to Alexandros M. for providing some examples! References: [1] ds9: http://ds9.si.edu/site/Home.html …
A quick note on gethead of WCSTools – as I have needed many times (but obviously not that many to remember it!). Rather straightforward use: gethead HEADER_KEY image.fits (as simple as possibly!) If HEADER_KEY contains empty spaces then use double quotes, e.g. “HIERARCH TEL AIRM END”. Reminder: you have to …
After a long time I finally managed to understand how to use IRAF’s sbands, along with a standard star and a filter. 1. If you want to use a spectrum from the standard star library of IRAF, you have to convert it from a .dat file to an image file …
Ok, it is time to try this promising thing called BibTeX [1,2,3], which allows you to use only one file with references* (suppose MyBibTeX.bib). Then, it easy to add references in any document just by simple adding the file and the citations. Although it seems rather straightforward hot to make …
How to make a dictionary of dictionaries with lists inside? For example we have a number of stellar spectral types (spec) and for each one of them we have a series of spectral lines (line) and their equivalent widths (ew). By creating a rather complex dictionary we can then call …
Although the are many information on how to use the genfromtxt (from numpy) there is not a clear demonstration (that I found…) to show how to easily read a text file with columns of data (including strings – it is straightforward to read columns of numbers with loadtxt for example). …