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Spectral Transformation Detection in Be Stars Using Multi-Parameters Analysis of Delta Scorpii, Eta Centauri, and Kappa Lupi
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Spectral Transformation Detection in Be Stars Using Multi-Parameters Analysis of Delta Scorpii, Eta Centauri, and Kappa Lupi
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Journal Article
Spectral Transformation Detection in Be Stars Using Multi-Parameters Analysis of Delta Scorpii, Eta Centauri, and Kappa Lupi
2024
Overview
Over the past five years, the Bosscha Observatory in Bandung, Indonesia, has dedicated significant attention to studying B-emission (Be) stars exhibiting distinctive emission characteristics. In this work, we meticulously analyzed the spectra originating from three prominent Be stars: Delta Scorpii, Eta Centauri, and Kappa Lupi. We also took additional spectrum data from the BeSS repository for each of the three stars to maximize our analysis results. Our analysis revolved around quantifying crucial spectral attributes, including the emission peak centers, the equivalent width (EW), and the full width at half maximum (FWHM). These parameters proved pivotal for deriving the violet-to-red peak intensity ratio (V/R), emission-to-continuum ratio (E/C), and the star’s radial velocity. Based on our analysis, there are several things to be pointed out. For all stars, there was no such significant variation in E/C values. Our single-peak analysis of δ Sco showed a strong emission primarily caused by the presence of a circumstellar disk of gas. FWHM of Hα in κ Lup demonstrated minor variability with time, meanwhile FWHM of Hα in η Cen decreased with time and orbital phase. Much more intense observations and analysis should provide better data to conclude the variability pattern of those parameters.
Publisher
IOP Publishing
Subject
