KIC 3240411 – the hottest known SPB star with the asymptotic g–mode period spacing

Abstract

We report the discovery of the hottest hybrid B-type pulsator, KIC 3240411, that exhibits the period spacing in the low-frequency range. This pattern is associated with asymptotic properties of high-order gravity (g-) modes. Our seismic modelling made simultaneously with the mode identification shows that dipole axisymmetric modes best fit the observations. Evolutionary models are computed with MESA code and pulsational models with the linear non-adiabatic code employing the traditional approximation to include the effects of rotation. The problem of mode excitation is discussed. We confirm that significant modification is indispensable to explain an instability of both pressure and gravity modes in the observed frequency ranges of KIC 3240411.

Asteroseismology of High-Mass Stars: New Insights of Stellar Interiors With Space Telescopes

“…Since the end of the nominal 4-years Kepler mission, the extremely high precision light curves have been used to discover and analyse rotationallysplit modes and period spacing patterns of prograde dipole g modes in dozens of SPB stars (Pápics et al, 2014(Pápics et al, , 2015(Pápics et al, , 2017. Such asteroseismic studies have revealed the interior rotation rates, convective core overshooting and mixing in main-sequence B stars (Moravveji et al, 2015(Moravveji et al, , 2016Szewczuk and Daszyńska-Daszkiewicz, 2018). Despite massive stars not being included in the Kepler field of view, ingenious techniques to extract the light curves of nearby massive stars have been successful (Pope et al, 2016(Pope et al, , 2019a, which includes the scattered-light variability of the O9.5 Iab star HD 188209 (Aerts et al, 2017).…”

“…KIC 3240411 was found to be a relatively young star near the zero-age main sequence with the upper limit on its convective core overshooting being f ov ≤ 0.030. The best-fitting model parameters (i.e., model #2 in Table 2 of Szewczuk and Daszyńska-Daszkiewicz, 2018) are included in Table 1. Importantly, Szewczuk and Daszyńska-Daszkiewicz (2018) also studied the effect of rotation and opacity data within their modeling for the purposes of explaining mode excitation of high-radial order g modes in such stars.…”

Asteroseismic masses, ages, and core properties of γ Doradus stars using gravito-inertial dipole modes and spectroscopy

“…Secure mode identification had to await nearly unin-Contact: joey.mombarg@kuleuven.be terrupted time series photometry with at least a factor ten longer time base, such as that assembled with the Kepler space telescope (Borucki et al 2010). Meanwhile, lots of progress has been made on the observational side in this topic over the past few years with firm detections of period spacing patterns reported in Pápics et al (2014Pápics et al ( , 2015; Kurtz et al (2014); Saio et al (2015); Van Reeth et al (2015a); Schmid et al (2015); Van Reeth et al (2016); Murphy et al (2016); Guo et al (2016); Ouazzani et al (2017); Saio et al (2017Saio et al ( , 2018; Szewczuk & Daszyńska-Daszkiewicz (2018) and Li et al (2019).…”

Binary asteroseismic modelling: isochrone-cloud methodology and application toKeplergravity mode pulsators

“…This theoretical interpretation has been used to interpret period spacing patterns detected in space photometry in terms of near-core rotation, overshooting, and diffusive envelope mixing (Van Reeth et al 2016;Moravveji et al 2015Moravveji et al , 2016Schmid & Aerts 2016;Ouazzani et al 2017;Pápics et al 2017). Recently, period-spacing patterns have been modelled to reveal the shape and extent of core overshooting in a handful of SPB and γ Dor stars (Moravveji et al 2015(Moravveji et al , 2016Schmid & Aerts 2016;Buysschaert et al 2018;Szewczuk & Daszyńska-Daszkiewicz 2018). Additionally period spacing patterns allowed Aerts et al (2017) to place the detected near-core rotation rates into an evolutionary sequence, with the aim to remedy shortcomings in angular momentum transport inside stars.…”