000006240 001__ 6240
000006240 005__ 20230127132516.0
000006240 0247_ $$2DOI$$a10.1093/mnras/stac289
000006240 037__ $$aSCART-2023-0099
000006240 100__ $$aLampens, P.
000006240 245__ $$aUpdated modelling and refined absolute parameters of the oscillating eclipsing binary AS Eri
000006240 260__ $$c2022
000006240 500__ $$aeprint: arXiv:2202.01767
000006240 520__ $$aWe present a new study of the Algol-type eclipsing binary system AS Eri based on the combination of the MOST and TESS light curves and a collection of very precise radial velocities obtained with the spectrographs HERMES operating at the Mercator telescope, La Palma, and TCES operating at the Alfred Jensch telescope, Tautenburg. The primary component is an A3 V-type pulsating, mass-accreting star. We fitted the light and velocity data with the package PHOEBE, and determined the best-fitting model adopting the configuration of a semi-detached system. The orbital period has been improved using a recent (O-C) analysis and the phase shift detected between both light curves to the value 2.6641496 \pm 0.0000001 d. The absence of any cyclic variation in the (O-C) residuals confirms the long-term stability of the orbital period. Furthermore, we show that the models derived for each light curve separately entail small differences, e.g. in the temperature parameter Teff,2. The high quality of the new solutions is illustrated by the residuals. We obtained the following absolute component parameters: L_1 = 14.125 L_sol, M_1 = 2.014 M_sol, R_1 = 1.733 R_sol, log g_1 = 4.264, L_2 = 4.345 L_sol, M_2 = 0.211 M_sol, R_2 = 2.19 R_sol, log g_2 = 3.078 with T_eff,2/T_eff,1 = 0.662 \pm 0.002. Although the orbital period appears to be stable on the long term, we show that the light-curve shape is affected by a years-long modulation which is most probably due to the magnetic activity of the cool companion.
000006240 594__ $$aNO
000006240 6531_ $$aTechniques: photometric; techniques: spectroscopic; binaries:
000006240 6531_ $$a eclipsing; binaries: spectroscopic; stars: fundamental parameters;
000006240 6531_ $$a stars: oscillations; Astrophysics - Solar and Stellar Astrophysics
000006240 700__ $$aMkrtichian, D.
000006240 700__ $$aLehmann, H.
000006240 700__ $$aGunsriwiwat, K.
000006240 700__ $$aVermeylen, L.
000006240 700__ $$aMatthews, J.
000006240 700__ $$aKuschnig, R.
000006240 773__ $$c917 - 925$$pMonthly Notices of the Royal Astronomical Society$$v512$$y2022
000006240 8560_ $$fpatricia.lampens@observatoire.be
000006240 85642 $$ahttps://ui.adsabs.harvard.edu/abs/2022MNRAS.512..917L
000006240 905__ $$apublished in
000006240 980__ $$aREFERD