Absorption Components Of Lines Research Articles

Influence of gravitational microlensing on broad absorption lines of QSOs: The case of the Fe K α line

Here we give a brief overview of some investigations of the gravitational microlensing influence on broad absorption spectral lines of lensed QSOs. Especially, we consider the microlensing influence on the Fe K α broad absorption lines using a model of an accretion disk covered by an absorption region. Gravitational microlensing is modeled by ray shooting method which enables us to obtain realistic microlensing patterns. We obtain that microlensing can affect both emission and absorption component of line that depends on dimensions on emission and absorption line regions. Here we give detailed analysis of emission and absorption line shape variations due to gravitational microlensing.

A model for P CYG based on the HeI spectrum.

view Abstract Citations (11) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A model for P Cygni based on the He I spectrum. Oegerle, W. R. ; van Blerkom, D. Abstract Recent work on the interpretation of hydrogen emission lines from P Cygni has led to contradictory models of its atmosphere. In order to resolve the problem, we have constructed a model for He i emission in an accelerating envelope. The statistical equilibrium equations are solved at several points in the envelope using a 36 level neutral helium atom with continuum and the escape probability method to simplify the transfer of radiation. The resulting line profiles agree quite well with the observed lines for a mass loss rate of 2 x 10-6 M0 yr -`. The unusual behavior of helium lines, noted by Adams and Merrill, in which absorption components of lines in the same series have quite different displacements from line center, is a natural consequence of our model. The evidence of the radial velocity-excitation potential relation together with our line profile results point strongly to an accelerating flow in the region of P Cygni's envelope where the He I spectrum is formed. Subject headings: line profiles - stars: atmospheres - stars: circumstellar shells - stars: emission-line Publication: The Astrophysical Journal Pub Date: September 1976 DOI: 10.1086/154626 Bibcode: 1976ApJ...208..453O full text sources ADS | data products SIMBAD (1)