synthpop.modules.extinction.fitzpatrick2009
===========================================

.. py:module:: synthpop.modules.extinction.fitzpatrick2009

.. autoapi-nested-parse::

   Extinction law from Fitzpatrick & Massa (2009), where an alternative to
   a lower law model allows for good fit among many lines of sight when the 
   free parameters are varied appropriately.

   Function dependent on R_V and alpha parameters, 
   typically alpha~2.5 and R_V=3 (our defualt), or
   alpha~1.8, R_V~5.

   Valid from 0.5-3 microns.

   Source DOI: 10.1088/0004-637X/699/2/1209



Classes
-------

.. autoapisummary::

   synthpop.modules.extinction.fitzpatrick2009.Fitzpatrick2009


Module Contents
---------------

.. py:class:: Fitzpatrick2009(R_V: float = 3.1, alpha: float = 2.5, **kwargs)

   Bases: :py:obj:`synthpop.modules.extinction._extinction.ExtinctionLaw`


   Extinction law from Fitzpatrick et al. (2009)
      
   Attributes
   -------
   R_V=3.1 : float
       optical total-to-selective extinction ratio
   alpha=2.5 : float
       exponent in extinction law function


   .. py:attribute:: extinction_law_name
      :value: 'Fitzpatrick2009'



   .. py:attribute:: law_ref_wavelength
      :value: 0.549



   .. py:attribute:: R_V
      :value: 3.1



   .. py:attribute:: alpha
      :value: 2.5



   .. py:attribute:: min_wavelength
      :value: 0.5



   .. py:attribute:: max_wavelength
      :value: 3.0



   .. py:method:: Alambda_Aref(eff_wavelength: float) -> float

      Given an effective wavelength lambda_eff, calculate the extinction ratio A_lambda/A_ref

      Parameters
      ----------
      eff_wavelength : float
          wavelength to compute extinction ratio at [microns]