Cardelli89

class beast.physicsmodel.dust.extinction.Cardelli89[source]

Bases: ExtinctionLaw

Cardelli89 Milky Way R(V) dependent Extinction Law

From Cardelli, Clayton, and Mathis (1989, ApJ, 345, 245).

Fitzpatrick99 should be used instead except for historical purposes as this newer law is based on 10x more observations and a better treatment of the optical/NIR photometry based portion of the curves.

Methods Summary

function(lamb[, Av, Rv, Alambda])

Cardelli89 extinction Law

Methods Documentation

function(lamb, Av=1.0, Rv=3.1, Alambda=True, **kwargs)[source]

Cardelli89 extinction Law

Parameters:

  • lamb (float or ndarray(dtype=float)) – wavelength [in Angstroms] at which to evaluate the law.

  • Av (float) – desired A(V) (default: 1.0)

  • Rv (float) – desired R(V) (default: 3.1)

  • Alambda (bool) – if set returns +2.5*1./log(10.)*tau, tau otherwise

Returns:

r – attenuation as a function of wavelength depending on Alambda option +2.5*1./log(10.)*tau, or tau

Return type:

float or ndarray(dtype=float)