A coordinated campaign of the intermediate polar AE aqr. 1: The system parameters

Details A coordinated campaign of the intermediate polar AE aqr. 1: The system parameters A coordinated campaign of the intermediate polar AE aqr. 1: The system parameters

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.282..182c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 1, pp. 182-190.

Astronomy and Astrophysics

Astronomy

40

Cataclysmic Variables, Stellar Mass Accretion, Spectrum Analysis, Stellar Spectra, Stellar Mass, Absorption Spectra, Line Spectra, Accretion Disks, Classifications, Flux (Rate)

Scientific paper

We report intermediate resolution spectroscopy (50 km/s) of the magnetic Cataclysmic Variable AE Aqr performed as part of the World Astronomy Days (WAD) campaign. Our analysis of the absorption features supports a K4 classification for the companion star, which contributes more than 95% of the total flux in the range 600-700 nm. We find that the companion star fills its Roche lobe since we detect a 10% modulation in the rotational broadening (V sin i) of the absorption fines, due to the changing geometry. Model fitting to the V sin i(phi) curve enables us to measure directly the system inclination (i = 58 +/- 6 deg) and the gravity darkening coefficient (beta = 0.08 +/- 0.01). Improved orbital parameters are also presented, including an updated mass ratio (q = K1/K2 = 0.630 +/- 0.012) based upon our K2 value and the spin-pulse delay. An independent determination of q is also provided by correcting the phase-averaged V sin i for non-spherical effects. The need for these two values to agree constrain the limb-darkening coefficient to be epsilon approximately equal to 0.40 (for beta = 0.08). The component masses derived from our values of K2, q and i are M1 = 0.79 +/- 0.16 solar mass units and M2 = 0.50 +/- 0.10 solar mass units. In addition, we do not see spectral evidence of irradiation effects.

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