Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...683..409c&link_type=abstract
The Astrophysical Journal, Volume 683, Issue 1, pp. 409-423.
Astronomy and Astrophysics
Astronomy
1
Stars: Novae, Cataclysmic Variables
Scientific paper
We present phase-resolved low-resolution infrared spectra of AM Her and ST LMi, two low-field polars that we observed with SPEX on the IRTF. Optical/NIR light curves are also published to help constrain the viewing geometry and brightness of the objects at the time they were observed. Currently, only limited IR spectra have been published for these objects, and none with the phase-coverage presented here. In both cases, the resulting spectra are dominated by emission from the secondary star in the NIR. However, the emission regions are also self-eclipsed, allowing us to isolate the cyclotron emission through subtraction of the dim-phase spectrum. We use a constant-lambda prescription to model the changing cyclotron features seen in the resulting data. For AM Her, we find a best-fit model of B=13.6 MG, kT=4.0 keV, and logΛ=5.0. The cyclotron derived accretion geometry is consistent with i=50deg and β=85deg. For ST LMi, B=12.1 MG, kT=3.3 keV, and logΛ=5.7, with i=55deg and β=128deg.
Campbell Ryan K.
Harrison Thomas E.
Kafka Stella
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