A local attenuation filter for accurate photometry of near-infrared bright stars

Takahiro Nagayama

doi:10.1117/12.2232593

22 July 2016 A local attenuation filter for accurate photometry of near-infrared bright stars

Takahiro Nagayama

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991237 (2016) https://doi.org/10.1117/12.2232593
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

I have developed a special ND filter (Local Attenuation Filter) for observing bright near-infrared stars. This filter is a 60mm diameter with a 4mm thickness, on which an attenuation (0.02% transparency) patch with an 8mm diameter is coated. This filter is expected to be installed near the focal plane of telescope, and the flux through this patch is attenuated. Using this filter, we can observe the attenuated bright star together with not affected field stars as reference for relative photometry. This filter has been installed to the IRSF 1.4m telescope and used for the monitoring of NIR bright stars, for example, η Car.

Citation Download Citation

Takahiro Nagayama "A local attenuation filter for accurate photometry of near-infrared bright stars", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991237 (22 July 2016); https://doi.org/10.1117/12.2232593

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