在邻近星系中发现新的B[e]超巨星和候选亮蓝变量

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS Galaxies Pub Date : 2023-06-19 DOI:10.3390/galaxies11030079
G. Maravelias, Stephan de Wit, A. Bonanos, F. Tramper, G. Munoz-Sanchez, E. Christodoulou
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引用次数: 0

摘要

质量损失是决定恒星演化的关键参数之一。尽管我们在过去几十年中取得了进展,但我们仍然无法将观测所得的值与理论预测相匹配。更糟糕的是,在某些阶段,如B[e]超巨星(B[e]SGs)和发光蓝变星(LBVs),在那里大量的质量会通过偶发或爆发活动而损失。这导致它们周围形成各种结构,允许尘埃形成,使这些物体成为明亮的红外光源。evaluate项目旨在通过检测大量的冷热天体(如B[e]SGs/ lbv)来确定偶发性质量在大质量恒星演化中的作用。为此,我们发起了一项大型观测活动,以获得27个附近星系中约1000个红外选择源的光谱数据。在这个项目中,我们成功地确定了七个B[e]超巨星(一个候选)和四个发光蓝变量,其中六个和两个分别是新发现的。我们使用光谱学、光度学和光曲线信息来更好地约束所报道物体的性质。我们特别注意到在金属丰度低至0.14 Z⊙的环境中存在B[e]SGs。
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Discovering New B[e] Supergiants and Candidate Luminous Blue Variables in Nearby Galaxies
Mass loss is one of the key parameters that determine stellar evolution. Despite the progress we have achieved over the last decades we still cannot match the observational derived values with theoretical predictions. Even worse, there are certain phases, such as the B[e] supergiants (B[e]SGs) and the Luminous Blue Variables (LBVs), where significant mass is lost through episodic or outburst activity. This leads to various structures forming around them that permit dust formation, making these objects bright IR sources. The ASSESS project aims to determine the role of episodic mass in the evolution of massive stars, by examining large numbers of cool and hot objects (such as B[e]SGs/LBVs). For this purpose, we initiated a large observation campaign to obtain spectroscopic data for ∼1000 IR-selected sources in 27 nearby galaxies. Within this project we successfully identified seven B[e] supergiants (one candidate) and four Luminous Blue Variables of which six and two, respectively, are new discoveries. We used spectroscopic, photometric, and light curve information to better constrain the nature of the reported objects. We particularly noted the presence of B[e]SGs at metallicity environments as low as 0.14 Z⊙.
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来源期刊
Galaxies
Galaxies Physics and Astronomy-Astronomy and Astrophysics
CiteScore
4.90
自引率
12.00%
发文量
100
审稿时长
11 weeks
期刊介绍: Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.
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