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Control Number
979
Presentation Preference
Poster
Title
Comparing Constant Lambda And Structured Shock Cyclotron Models On Phase-resolved Spectra Of Low Mass Accretion Rate Polars
Author Block
Ryan Campbell1, T. E. Harrison2
1CTIO, 2New Mexico State University.
Category
13. Evolved Stars, Cataclysmic Variables, Novae, Wolf-Rayet Phenomena
Abstract
We model phase-resolved (0.1 phase intervals) cyclotron spectroscopy of three polars (EQ Cet, EF Eri, and MQ Dra). The first two datasets were obtained with IRTF/SpeX, while the Bok 2.3-m was used for MQ Dra. For each object, the data are modeled in two ways. First, a Constant Lambda (CL) code based on the work of Schwope et al. (1990), was fit to the data. CL uses four global parameters to approximate the accretion shock: B, the magnetic field strength, kT, the plasma temperature, Lambda, the "size parameter", and Theta, the viewing angle. While the CL code does a good job
recreating the observed data, Structured Shock codes (SS) offer enhanced insight into the mechanisms at work in these objects, by fully resolving the accretion site and computing the radiative transfer through the plasma. To allow for this more physical setup, we use the Fischer and Beuermann (2001) SS code on each object. This poster will be the first published work to contrast
results from CL and SS codes on a phase-resolved dataset.
 
 
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