论文标题
高清139614的精确的强震年龄和金属性：上环狼疮中带有原星盘的预序列恒星
A precise asteroseismic age and metallicity for HD 139614: a pre-main-sequence star with a protoplanetary disc in Upper-Centaurus Lupus
论文作者
论文摘要
HD \，139614是$ \ sim $ \ sim $ 14米的，可能是上半月形 - 卢普斯子组的SCO-CEN OB关联中的预序列明星，其中包含一个或多个行星上的含有环形圆盘，其中包含一个稍微翘曲的环形盘。该星的化学丰度模式除了挥发性元素外，它的化学丰度缺陷是金属缺陷的，该元素将其置于$λ$ boo类中，并暗示它最近具有富含气体但贫困的粉尘材料。我们使用Tess Light曲线和échelle图确定了其$δ$ SCT脉冲中的七个偶极子和四种径向脉动模式。使用MESA恒星演化和Gyre恒星振荡程序进行精确建模证实它是在序列序列上的。 Asterose普，基于网格的建模表明，年龄为$ 10.75 \ PM0.77 $ MYR，质量为$ 1.52 \ pm0.02 $ m $ _ {\ odot} $，全球金属丰度为$ z = 0.0100 \ pm0.0010 $。这代表了$λ$ boo Star的散装金属性的第一个小意震症。精确的年龄和金属性为上城的年龄估计（卢普斯）提供了基准，并了解了中间质量恒星周围的椎间盘保留和行星形成。
HD\,139614 is known to be a $\sim$14-Myr-old, possibly pre-main-sequence star in the Sco-Cen OB association in the Upper Centaurus-Lupus subgroup, with a slightly warped circumstellar disc containing ring structures hinting at one or more planets. The star's chemical abundance pattern is metal-deficient except for volatile elements, which places it in the $λ$ Boo class and suggests it has recently accreted gas-rich but dust-poor material. We identify seven dipole and four radial pulsation modes among its $δ$ Sct pulsations using the TESS light curve and an échelle diagram. Precision modelling with the MESA stellar evolution and GYRE stellar oscillation programs confirms it is on the pre-main sequence. Asteroseismic, grid-based modelling suggests an age of $10.75\pm0.77$ Myr, a mass of $1.52\pm0.02$ M$_{\odot}$, and a global metal abundance of $Z=0.0100\pm0.0010$. This represents the first asteroseismic determination of the bulk metallicity of a $λ$ Boo star. The precise age and metallicity offer a benchmark for age estimates in Upper Centaurus--Lupus, and for understanding disc retention and planet formation around intermediate-mass stars.
