000004744 001__ 4744
000004744 005__ 20200131165037.0
000004744 037__ $$aCTALK-2020-0100
000004744 100__ $$aIrrgang, A.
000004744 245__ $$aThe slowly pulsating B-star 18 Peg: a testbed for upper main sequence stellar evolution
000004744 260__ $$c2019
000004744 269__ $$c2019-08-20
000004744 520__ $$aThe predicted width of the upper main sequence in stellar evolution models depends on the empirical calibration of the convective overshooting parameter. Despite decades of discussions, its precise value is still unknown and further observational constraints are required to gauge it. In 2016, Irrgang et al. discovered that the mid B-type subgiant 18 Peg is one of the most evolved members of the rare class of slowly pulsating B-stars and, thus, bears some potential to derive a tight lower limit for the width of the upper main sequence. Here, we report on new photometric and spectroscopic analyses based on follow-up observations obtained with the BRITE-Heweliusz satellite and the Hermes spectrograph, which, among others, led to a revised oscillation frequency as well as to an updated radial-velocity curve of this single-lined spectroscopic binary system.
000004744 594__ $$aNO
000004744 700__ $$aDe Cat, P
000004744 700__ $$aPigulski, A.
000004744 700__ $$aHandler, G.
000004744 700__ $$aTkachenko, A.
000004744 700__ $$aBRITE, team
000004744 773__ $$t"Stars and their variability observed from space - Celebrating the 5th anniversary of BRITE-Constellation", Vienna, Austria
000004744 8560_ $$fpeter.decat@observatoire.be
000004744 906__ $$aContributed
000004744 980__ $$aCTALKCONT