Wide angle high speed photometry

广角高速测光

• 批准号: 319271541
• 负责人: Professor Dr. Jürgen H.M.M. Schmitt
• 金额: --
• 依托单位: Hamburger Sternwarte
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319271541?language=en
• 关键词: Wide; angle; speed; photometry

Scintillation, i.e., the ''twinkling'' of stars, is the limiting factor for all optical ground-based photometry, even at large telescopes. The usual approach to beat down on scintillation noise is the use of large telescopes and long integration times. In this funding application we propose to use a different ansatz: We propose to conduct simultaneous high-speed observations of samples of stars. In this fashion we can sample measurements along multiple lines of sights, which are characterized by the same scintillation power. Hence the technique of ensemble photometry is extended to very short time scales to include accurate measurements of the scintillation power in the sample.In order to obtain the necessary observations a wide field telescope with a high speed camera is necessary. To work economically we use commercial equipment in the form of a C14 telescope with a hyperstar lens, which effectively acts as a Schmidt camera with a field of view of 1.4 square degrees.For imaging we propose to utilize the recently developed scientific sCMOS technology, which provides active pixel detectors with a peak quantum efficiency is 57% at 550 nm and a full frame (2560 x 2160 pixels) read-out capability of 100 Hz at a read-out noise level of 1.4~e-/pixel will a full well capacity of about 30000 e-. For data storage we propose to construct a system that is able to take and store thedata ''in real time'' and propose to accomplish this with a server system that reads the data out of the camera buffer and transfer the data with a fiber link to a RAID server.In the context of this funding application we want to setup a working system, capable of producing and storing full frames at a rate of 100 Hz for at about five hours; the proposed system generates about 15 Tbyte of data during that time. With this system we want to perform a number of key science observations in the fields of scintillation theory, extrasolar planets, bright variable stars, flare stars and lunar occultation studies.

闪烁，即恒星的“闪烁”，是所有地面光学测光的限制因素，即使在大型望远镜上也是如此。对付闪烁噪声的常用方法是使用大型望远镜和较长的积分时间。在这项资助申请中，我们建议使用不同的方法：我们建议同时对恒星样本进行高速观测。在这种方式下，我们可以沿着多个视点进行采样测量，这些视点的特点是具有相同的闪烁功率。因此，集合测光技术被扩展到非常短的时间尺度，以包括样品中闪烁功率的精确测量。为了获得必要的观测结果，需要一个带高速照相机的大视场望远镜。为了经济起见，我们使用了商用设备，即带有超星透镜的C14望远镜，它有效地充当了施密特相机的作用，视场为1.4平方度。对于成像，我们建议利用最近开发的科学sCMOS技术，该技术提供主动像素探测器，在550 nm处峰值量子效率为57%，在读出噪声水平为1.4~e-/像素时，全帧（2560 x 2160像素）读出能力为100 Hz，全井容量约为30000 e-。对于数据存储，我们建议构建一个能够“实时”获取和存储数据的系统，并建议通过一个服务器系统来完成这一任务，该系统从相机缓冲区中读取数据，并通过光纤链路将数据传输到RAID服务器。在这个融资申请的背景下，我们希望建立一个工作系统，能够以100赫兹的速率在大约5小时内产生和存储完整的帧；该系统在此期间产生约15tbyte的数据。有了这个系统，我们想在闪烁理论、系外行星、明亮变星、耀斑星和月球掩星研究等领域进行一些关键的科学观测。