BRITE星座揭示了神秘双星$η$船底座脉动的证据
BRITE-Constellation reveals evidence for pulsations in the enigmatic binary $η$ Carinae
摘要：
$η$ Car是一颗巨大的偏心双星，有着丰富的观测历史。我们在2016年和2017年分别用6个月和6个月的BRITE-Constellation纳米卫星获得了第一个高节奏、高精度的光变曲线。光变曲线被几个来源污染，包括侏儒星云和邻近的恒星，包括食双星CPD $-$ 59 $^\circ$ 2628。然而，我们在光变曲线中发现了两个相干振荡。这些可能代表脉动，尚未了解，但我们假设，他们是有关潮汐激发振荡的$η$车的主星，并将类似于那些检测到的低质量偏心双星。特别是，van Genderen等人和Sterken等人在1974年至1995年期间通过光度最大值的定时测量检测到一个频率。因此，这个频率似乎已经被检测到了近四十年，这表明它在这段时间内的频率是稳定的。这些脉动可以帮助提供第一个直接约束的基本参数的主要恒星，如果确认和完善与未来的观测。
英文摘要：
$η$ Car is a massive, eccentric binary with a rich observational history. We obtained the first high-cadence, high-precision light curves with the BRITE-Constellation nanosatellites over 6 months in 2016 and 6 months in 2017. The light curve is contaminated by several sources including the Homunculus nebula and neighboring stars, including the eclipsing binary CPD$-$59$^\circ$2628. However, we found two coherent oscillations in the light curve. These may represent pulsations that are not yet understood but we postulate that they are related to tidally excited oscillations of $η$ Car's primary star, and would be similar to those detected in lower-mass eccentric binaries. In particular, one frequency was previously detected by van Genderen et al. and Sterken et al. through the time period of 1974 to 1995 through timing measurements of photometric maxima. Thus, this frequency seems to have been detected for nearly four decades, indicating that it has been stable in frequency over this time span. These pulsations could help provide the first direct constraints on the fundamental parameters of the primary star if confirmed and refined with future observations.
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