Muhammad Fajrin, Hakim L. Malasan, Emanuel S. Mumpuni, Evan I. Akbar, Aliyya N. Rahma, Agus T.P. Jatmiko
NGC 6818 is a bright, high-excitation, fairly regular, planetary nebula with a rather rich spectrum. Thus, makes it one of the easiest to be observed using small to intermediate class telescope. In this paper we report our work on spectroscopic observation of NGC 6818 carried out at Bosscha Observatory. The low dispersion spectrum obtained using a 11” Celestron C11 (F/10) and NEO-R1000 spectrograph is used to derive nebular chemical properties e.g. electron temperature and electron density, as well as its chemical composition. Using the obtained high dispersion spectrum from observation done using Shelyak's LHIRES III spectrograph mounted on 10” Meade LX200R SCT (F/9.84), nebular expansion velocity is also derived and with images obtained from Hubble Space Telescope (HST) distance to the nebula is calculated using expansion parallax method. The overall nebular properties derived from the emission spectra agrees with the already published values. The blended [NII] lines with Hα appeared to cause a discrepancy in Te derived from [NII] ions. The nebular expansion velocity of 35 km/s leads to an estimated expansion parallax distance in range of 400-1600 pc. © 2023 American Institute of Physics Inc.. All rights reserved.
Department of Astronomy, Jl. Ganesa 10, Lebak Siliwangi, Coblong, Bandung, Jawa Barat, Indonesia; Bosscha Observatory, Institut Teknologi Bandung, Jl. Peneropongan Bintang, Lembang, Kabupaten Bandung Barat, Jawa Barat, Indonesia; ITERA Astronomical Observatory, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Jatisari, Lampung Selatan, Lampung, Indonesia; Research Center for Space, National Research and Innovation Agency (BRIN), Jl. Dr. Djunjunan No. 133, Bandung, Jawa Barat, Indonesia
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