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arXiv 1706.09202astro-ph.IM
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VBT中阶梯摄谱仪的稳定性分析

Stability analysis of VBT Echelle spectrograph for precise radial velocity measurements

Sireesha Chamarthi, Ravinder K. Banyal, S. Sriram, Gajendra Pandey

摘要:

位于Kavalur的2.3米瓦伊努巴普望远镜(VBT)上的光纤馈电中阶梯摄谱仪自2005年以来一直在运行。由于近年来精密光谱学的各种技术进步,在观测天文学中开辟了几条研究途径。这些发展产生了提高光谱仪多普勒精度的需求。目前,仪器的稳定性受到Echelle室内温度和压力波动的影响。此外,需要一种更好的波长校准方法来仔细跟踪和解开恒星光谱的仪器效应。在计划使用碘吸收气室进行可能的升级时,我们使用ThAr气体放电灯拍摄的一系列校准帧来测量光谱仪的原始稳定性。时间序列数据进行了分析与互相关的方法,并在不同的Echelle级的ThAr发射线的移动被准确地测量。在本文中,我们提出了我们的稳定性分析方法和结果的卡瓦勒摄谱仪。我们还确定了可能的错误来源,并讨论了我们的策略,以减轻他们。

英文摘要:

A fiber-fed Echelle spectrograph at 2.3 m Vainu Bappu Telescope (VBT), Kavalur, has been in operation since 2005. Owing to various technological advancements in precision spectroscopy in recent years, several research avenues have been opened in observational astronomy. These developments have created a demand to improve the Doppler precision of our spectrograph. Currently, the stability of the instrument is compromised by the temperature and pressure fluctuations inside the Echelle room. Further, a better wavelength calibration approach is needed to carefully track and disentangle the instrumental effects from stellar spectra. While planning a possible upgrade with an Iodine absorption gas cell, we measured the raw stability of the spectrograph using a series of calibration frames taken with the ThAr gas discharge lamp. The time series data were analysed with cross-correlation method and the shift in ThAr emission lines was accurately measured across different Echelle orders. In this paper, we present our stability analysis methodology and results for the Kavalur spectrograph. We also identify possible sources of error and discuss our strategy to mitigate them.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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