Slit Grating and its Use in Visual Double Stars Observation Satrio Fatkhusalma (1,2*), Mochamad Irfan (2), Hakim Luthfi Malasan (1,2,3,4)
1) Astronomy Division, Institut Teknologi Bandung, Bandung 40312, Indonesia
2) Bosscha Observatory, Institut Teknologi Bandung, Bandung 40312, Indonesia
3) Department of Atmospheric and Planetary Sciences, Institut Teknologi Sumatera, Lampung 35365, Indonesia
4) ITERA Astronomical Observatory, Institut Teknologi Sumatera, Lampung 35365, Indonesia
Abstract
Visual double star is a type of double stars in which studies about the orbits of the system has interesting value. The visual double star^s orbit became harder to analyse if the pair has large difference in magnitude and small separation angle. There are many methods which can be used to facilitate the analysis of the centroid of its orbit. One of those methods is by using double star grating. Double star grating can be used for visual double star that has large difference in magnitude and small separation angle. This grating works in similar principle as diffraction, in which it scattered incoming light and reduced the light^s intensity, so the double star^s orbit centroid can be easily determined. In this work, the visual double star observation of WDS 19387-1009 (STF2545AB) and WDS 22525-3253 (HJ5367) has been taken by using Zeiss 60 cm Double Refractor at Boscha Observatory with the double star grating that was placed around 20 cm before Zeiss 60 cm Double Refractor objective lens. Standard image reduction was done by using IRAF, so that clean images were obtained. The centroid of each double star will be analysed using PSF (Point Spread Function) fitting. The smallest error from PSF fitting will be chosen. The final data from this work (position angle and separation angle) will be uploaded to WDS catalogue for further analysis.
