Confirmation of the star J004229.87$+$410551.8 in M31 as B[e]-supergiant

Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022) Pub Date : 2022-09-27 DOI:10.22323/1.425.0047

A. Sarkisyan, A. Vinokurov, Solovyeva Yu., K. Atapin, O. Sholukhova, S. Fabrika, D. Bizyaev

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Abstract

We study the luminous blue variable candidate J004229.87+410551.8 in the Andromeda Galaxy. Earlier, the star displayed a spectral anomaly: although a hot emission spectrum had been detected, it had strong Ca ii H and K absorption lines. Subsequently the star was assumed to be a hot hypergiant or a B[e] supergiant. For the purpose of clear star classiﬁcation, we conducted spectroscopic and photometric analysis of the object and its surroundings with the 6-m telescope of SAO RAS, the 3.5-m ARC telescope of the Apache Point Observatory and the 2.5-m telescope of the Caucasus Mountain Observatory of the Sternberg Astronomical Institute. The spectrum of the star has the Fe ii, [Fe ii], [O i], and Balmer emission lines. Its spectral energy distribution shows an excess in the near-infrared range due to hot circumstellar dust. The indicated features and a high estimated value of star’s luminosity (log ( 𝐿 / 𝐿 (cid:12) ) = 4 . 6 ± 0 . 2) allow us to ﬁnally classify the object as a B[e] supergiant. Multifaceted Universe: Theory

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确认M31中的恒星J004229.87$+$410551.8为B[e]-超巨星

我们研究了仙女座星系中的亮蓝色候选变量J004229.87+410551.8。早些时候，这颗恒星显示出光谱异常:虽然探测到热发射光谱，但它有很强的钙、氢和钾吸收谱线。随后，这颗恒星被认为是一颗热超巨星或B[e]超巨星。为了清晰地进行恒星分类，我们使用了SAO RAS的6 m望远镜、Apache Point天文台的3.5 m ARC望远镜和Sternberg天文研究所高加索山天文台的2.5 m望远镜对该天体及其周围进行了光谱和光度分析。该恒星的光谱有Fe ii， [Fe ii]， [O i]和Balmer发射线。它的光谱能量分布在近红外范围内显示出由于热星周尘埃而产生的过剩。所指示的特征和恒星亮度的高估定值(log(𝐿/𝐿(cid:12)) = 4。6±0。2)使我们最终将该天体归类为B[e]超巨星。多面宇宙:理论

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Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)

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