论文标题
污染的白矮人G29-38的极化测量值
Polarization measurements of the polluted white dwarf G29-38
论文作者
论文摘要
我们已经对污染的白色矮人G29-38进行了高精度的极化观测，并具有高精度的极化仪器2。在两个不同的观测站进行了观测值 - 使用8.1-m Gemini North North望远镜和3.9-M Anglo Anterlo Australiantelescope进行观测，并与彼此保持一致。在允许少量的星际极化之后，发现系统的固有线性极化为275.3 +/- 31.9份量，零件 - 每千万毫克，位置角度为90.8 +/- 3.8度。我们将观察到的极化与情节盘模型的预测进行了比较。在我们开发的模型的背景下，测得的极化很小，这仅允许我们在光学薄的圆盘几何形状上对圆盘倾斜度和粘结反照率施加极限。在这种情况下，倾斜度接近面对面，或者反照率很小 - 可能在0.05至0.15范围内，这与其他碎屑盘测量相符。初步搜索G29-38脉动在极化信号中的影响会产生不一致的结果。这可能是由于跳动效应引起的，表明块状灰尘分布，或者是测量系统学的结果。
We have made high precision polarimetric observations of the polluted white dwarf G29-38 with the HIgh Precision Polarimetric Instrument 2. The observations were made at two different observatories -- using the 8.1-m Gemini North Telescope and the 3.9-m Anglo AustralianTelescope -- and are consistent with each other. After allowing for a small amount of interstellar polarization, the intrinsic linear polarization of the system is found to be 275.3 +/- 31.9 parts-per-million at a position angle of 90.8 +/- 3.8 degrees in the SDSS g' band. We compare the observed polarization with the predictions of circumstellar disc models. The measured polarization is small in the context of the models we develop which only allows us to place limits on disc inclination and Bond albedo for optically thin disc geometries. In this case either the inclination is near face-on or the albedo is small -- likely in the range 0.05 to 0.15 -- which is in line with other debris disc measurements. A preliminary search for the effects of G29-38's pulsations in the polarization signal produced inconsistent results. This may be caused by beating effects, indicate a clumpy dust distribution, or be a consequence of measurement systematics.
