On the sdOB primary of the post common-envelope binary AA Doradus (LB 3459)
Stefan Klepp, Thomas Rauch (Institute for Astronomy and, Astrophysics, Kepler Center for Astro, Particle Physics, Eberhard Karls, University, Tuebingen, Germany)

TL;DR
This study precisely determines the effective temperature and surface gravity of the sdOB primary in AA Doradus using high-resolution spectra and advanced non-LTE models, resolving a longstanding discrepancy in gravity measurements.
Contribution
The paper provides a refined measurement of surface gravity for AA Dor's primary, utilizing improved Stark-broadening data and high-quality observations, thus resolving previous inconsistencies.
Findings
Effective temperature Teff = 42000 +/- 1000 K
Surface gravity log g = 5.46 +/- 0.05
Resolution of the gravity discrepancy in AA Dor
Abstract
AA Dor is an eclipsing, post common-envelope binary with an sdOB-type primary and a low-mass secondary. Eleven years ago, an NLTE spectral analysis showed a discrepancy in the surface gravity that was derived by radial-velocity and light-curve analysis, log g = 5.21 +/- 0.1 (cm/sec^2) and log g = 5.53 +/- 0.03, respectively. We aim to determine both the effective temperature and surface gravity of AA Dor precisely from high-resolution, high-S/N observations taken during the occultation of the secondary. We calculated an extended grid of metal-line blanketed, state-of-the-art, non-LTE model atmospheres in the parameter range of the primary of AA Dor. Synthetic spectra calculated from this grid were compared to optical observations. We verify Teff = 42000 +/- 1000 K from our former analyses and determine a higher log g = 5.46 +/- 0.05. The main reason are new Stark-broadening tables…
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