تقرير
The PRL Stabilized High Resolution Echelle Fiber-fed Spectrograph: Instrument Description & First Radial Velocity Results
العنوان: | The PRL Stabilized High Resolution Echelle Fiber-fed Spectrograph: Instrument Description & First Radial Velocity Results |
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المؤلفون: | Chakraborty, Abhijit, Mahadevan, Suvrath, Roy, Arpita, Dixit, Vaibhav, Richardson, Eric Harvey, Dongre, Varun, Pathan, F. M., Chaturvedi, Priyanka, Shah, Vishal, Ubale, Girish P., Anandarao, B. G. |
سنة النشر: | 2013 |
المجموعة: | Astrophysics |
مصطلحات موضوعية: | Astrophysics - Instrumentation and Methods for Astrophysics |
الوصف: | We present spectrograph design details and initial radial velocity results from the PRL optical fiber-fed high-resolution cross-dispersed echelle spectrograph (PARAS), which has recently been commissioned at the Mt Abu 1.2 m telescope, in India. Data obtained as part of the post-commissioning tests with PARAS show velocity precision better than 2m/s over a period of several months on bright RV standard stars. For observations of sigma-Dra we report 1.7m/s precision for a period of seven months and 2.1m/s for HD 9407 over a period of 2 months. PARAS is capable of a single-shot spectral coverage of 3800A - 9500A at a resolution of about 67,000. The RV results were obtained between 3800A and 6900A using simultaneous wavelength calibration with a Thorium-Argon (ThAr) hollow cathode lamp. The spectrograph is maintained under stable conditions of temperature with a precision of 0.01 - 0.02C (rms) at 25.55C, and enclosed in a vacuum vessel at pressure of 0.1 +/-0.03 mbar. The blaze peak efficiency of the spectrograph between 5000A and 6500A, including the detector, is 30%; and about 25% with the fiber transmission. The total efficiency, including spectrograph, fiber transmission, focal ratio degradation (FRD), and telescope (with 81% reflectivity) is about 7% in the same wavelength region on a clear night with good seeing conditions. Comment: 33 pages, 15 figures, accepted for publication in PASP |
نوع الوثيقة: | Working Paper |
DOI: | 10.1086/675352 |
URL الوصول: | http://arxiv.org/abs/1312.5471 |
رقم الأكسشن: | edsarx.1312.5471 |
قاعدة البيانات: | arXiv |
DOI: | 10.1086/675352 |
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