B-emission Stars in Southern Sky Observed in Bosscha Observatory: Spectroscopic Study of Hα Spectral Line Variability

Authors

  • Aprilia Aprilia Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Hakim Luthfi Malasan Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Geavani Eva Ramadhania Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Agus Triono Puri Jatmiko Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Mochamad Irfan Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Dhimaz Gilang Ramadhan Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Ade Nur Istiqomah Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391
  • Evan Irawan Akbar Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Peneropongan Bintang 45, Lembang 40391

DOI:

https://doi.org/10.5614/j.math.fund.sci.2019.51.3.3

Keywords:

Be–methods, emission line, line profiles–stars, spectroscopy

Abstract

Hα line variations of 8 B-emission (Be) stars are presented. Stars that are listed in the Bright Star Catalogue were observed in 2009 at the Bosscha Observatory, Lembang, Indonesia. It was found that 4 stars showed phase changing from Be double-peaked to Be single-peaked emission line profiles, 1 showed single-peaked to double-peaked profiles, 1 showed double-peaked to B-normal, while two other stars did not show phase changing. The stars also showed variations in the V/R and E/C values, which represent the strength of the emission lines. The phase changes were detected from a comparison of the observed data to the current data in the BeSS database.

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2019-12-31

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