Response functions and contribution functions of photospheric lines

Details Response functions and contribution functions of photospheric lines Response functions and contribution functions of photospheric lines

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..227c&link_type=abstract

Astronomy and Astrophysics, vol. 54, no. 1, Jan. 1977, p. 227-231. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

51

Fraunhofer Lines, Line Spectra, Perturbation Theory, Photosphere, Radiative Transfer, Stellar Atmospheres, Electron Density (Concentration), Fraunhofer Line Discriminators, Spectral Energy Distribution, Stellar Spectra, Temperature Distribution, Thermodynamic Equilibrium

Scientific paper

An attempt is made to obtain the response function (RF) of a photospheric Fraunhofer line by solving the equation of radiative transfer in LTE using an appropriate perturbation method. A first-order expression for the RF is derived with which effects of arbitrary perturbations in thermodynamic quantities or velocity-field parameters on emergent line intensity can be evaluated. Perturbations considered to be amenable to such treatment include line-opacity Doppler shifts due to velocity fields, microturbulence variations, and temperature variations at constant electron density. Some examples of RFs for photospheric lines are presented, and an attempt is made to define the contribution function (CF) of a line depression in full analogy with that of the emergent intensity. It is noted that a CF should not be employed in place of the appropriate RF to predict the sensitivity of a Fraunhofer line to a perturbation at a given depth.

Affiliated with

Also associated with

No associations

Rating

Response functions and contribution functions of photospheric lines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Response functions and contribution functions of photospheric lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Response functions and contribution functions of photospheric lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-951376