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Exploring Be phenomena in OBA stars: a Mid-infrared search by Jian, Mingjie; Matsunaga, Noriyuki; Jiang, Biwei; Yuan, Haibo; Zhang, Ruoyi is a scholarly article available to read on EtoBox.

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As early-type stars with a rotation speed close to their critical velocity, Be stars experience an event called the Be phenomenon. The material in their equator is ejected into outside space during the Be phenomenon and forms a circumstellar disk. The mechanism triggering these events remains poorly understood, and observations of these events are limited because the duration of these events ranges from months to years. Long-term epoch photometry in the infrared bands is expected to be ideal for detecting Be phenomena because the brightness variation is larger, and the effect of interstellar extinction is weaker as well. We conducted a systematic search for Be phenomena among Milky Way OBA stars in the mid-infrared. We examined the brightness and colour variations of known classical Be stars using the WISE W1 and W2 photometry bands to quantify their characteristics. Subsequently, we established a set of criteria to identify similar photometric variations in a large sample of OBA stars. We found 916 OBA stars that show Be phenomena in the past 13 years, 736 of which are newly discovered. The peak-to-peak variations in magnitude and colour were found to be correlated, indicating tha

Author

Jian, Mingjie; Matsunaga, Noriyuki; Jiang, Biwei; Yuan, Haibo; Zhang, Ruoyi

Published

2023

Language

EN