New Insight into the FS CMa System MWC 645 from Near-Infrared and Optical Spectroscopy

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS Galaxies Pub Date : 2023-06-10 DOI:10.3390/galaxies11030072
A. Torres, M. Arias, M. Kraus, L. Mercanti, T. Eenmäe
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Abstract

The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC 645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 μm and 2.3 μm for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Hα emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
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从近红外光谱和光谱学对FS CMa系统MWC 645的新认识
B[e]现象表现为一群不均匀的恒星被具有相似物理条件的气体和尘埃包围。在这些恒星中,FS cma型天体被怀疑是双星系统,它们可能正在经历或已经经历了一个质量传递过程,这可以解释它们周围的大量物质。我们的目标是为最近确认的双星MWC 645的知识做出贡献,它可能正在经历一个活跃的传质过程。我们给出了近红外光谱和光学光谱,确定了原子和分子的光谱特征,并得出了谱线的不同定量性质。基于公开可用的光度数据,我们在光曲线中寻找周期性并建立光谱能量分布模型。我们首次在1.62 μm和2.3 μm处检测到CO的吸收分子带。我们导出了冷二元组分有效温度的上限。我们发现了α辐射的增强与光学亮度的降低之间的相关性,这可能与质量抛射事件或质量损失的增加有关。我们概述了包络层的全局特性,可能是由于变量消光引起的亮度变化的原因,并简要地推测了不同的可能情况。
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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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