q2 Python package

The q2 code allows you to use the 2019 MOOG version (in its SILENT mode) to calculate elemental abundances of stars and/or determine their atmospheric parameters using the standard techniques of iron line excitation/ionization equilibrium. It also allows you to calculate other fundamental stellar parameters such as mass and age using isochrones. A tutorial is available here.

Installation

The new version of q2 can only be installed via pip. Simply try:

pip install qoyllur-quipu

If you have installed the old version of q2, you must delete it from your HOME directory and also remove its PATH from bashrc (.bash_profile for Mac OS). Once you have installed q2, open a Jupyter Notebook Environment (or iPython) and import q2.

import q2

By importing q2, the latest version of MOOG (2019) will begin to install. The only thing you need to do is declare the kind of machine you are using, i.g., 'rh64' for 64-bit linux (Linux Mint, Ubuntu, etc), 'rh' for 32-bit linux system and 'maclap' for Mac Os. That's all folks. This process is done only once. Note that the q2 package requires Python 3.7 or later.

Future releases will be upgraded via:

pip install qoyllur-quipu --upgrade

Quickstart

Find spectroscopic parameters of a sample of stars using the Sun as the reference star (strict line-by-line differential analysis):

import q2
data = q2.Data('stars.csv', 'lines.csv')
sp = q2.specpars.SolvePars(grid='marcs')
q2.specpars.solve_all(data, sp, 'solution.csv', 'Sun')

Measure elemental abundances of a sample of stars with respect to the solar abundances (line-by-line):

species_ids = ['CI', 'OI', 'BaII']
q2.abundances.get_all(data, species_ids, 'abundances.csv', 'Sun')

Author

• Ivan Ramirez (iramirez@tacomacc.edu)

Maintainers

• Jhon Yana Galarza
• Kayleigh Meneghini

Preferred citation

If you make use of this code, please cite Ramirez et al. 2014, A&A, 572, A48. The BibTeX entry for the paper is:

@ARTICLE{Ramirez2014,
       author = {{Ram{\'\i}rez}, I. and {Mel{\'e}ndez}, J. and {Bean}, J. and {Asplund}, M. and {Bedell}, M. and {Monroe}, T. and {Casagrande}, L. and {Schirbel}, L. and {Dreizler}, S. and {Teske}, J. and {Tucci Maia}, M. and {Alves-Brito}, A. and {Baumann}, P.},
        title = "{The Solar Twin Planet Search. I. Fundamental parameters of the stellar sample}",
      journal = {\aap},
     keywords = {stars: abundances, stars: fundamental parameters, planetary systems, Astrophysics - Solar and Stellar Astrophysics},
         year = 2014,
        month = dec,
       volume = {572},
          eid = {A48},
        pages = {A48},
          doi = {10.1051/0004-6361/201424244},
archivePrefix = {arXiv},
       eprint = {1408.4130},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2014A&A...572A..48R},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}