仙女座λ的动态表面成像
Dynamical Surface Imaging of lambda Andromedae
摘要：
我们提出的RS CVn星λ仙女座的温度图，重建干涉数据在2010年和2011年获得的MIRC仪器在中心高角分辨率天文阵列。为了约束成像任务所需的恒星参数，我们首先使用GPU加速代码SIMTOI对恒星进行建模。然后使用我们的开源干涉成像代码ROTIR对恒星表面进行成像，在此过程中进一步完善了恒星参数的估计。我们报告说，测得的角直径为2.742 +/- 0.010质量与边缘暗化系数为0.231 +/- 0.024。虽然我们的图像与以前的作品是一致的，我们提供了更新的物理参数λ仙女座（R_star = 7.78 +/- 0.05 R_odot，M_star = 1.24 +/- 0.72 M_odot，log L/L_odot = 1.46 +/- 0.04）。
英文摘要：
We present temperature maps of RS CVn star lambda Andromedae, reconstructed from interferometric data acquired in 2010 and 2011 by the MIRC instrument at the Center for High Angular Resolution Astronomy Array. To constrain the stellar parameters required for this imaging task, we first modeled the star using our GPU-accelerated code SIMTOI. The stellar surface was then imaged using our open source interferometric imaging code ROTIR, in the process further refining the estimation of stellar parameters. We report that the measured angular diameter is 2.742 +/- 0.010 mas with a limb-darkening coefficient of 0.231 +/- 0.024. While our images are consistent with those of prior works, we provide updated physical parameters for lambda Andromedae (R_star = 7.78 +/- 0.05 R_odot, M_star = 1.24 +/- 0.72 M_odot, log L/L_odot = 1.46 +/- 0.04).
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