LAMOST J202629.80+423652.0不是一颗共生恒星

IF 0.4 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS

Contributions of the Astronomical Observatory Skalnate Pleso Pub Date : 2020-04-22 DOI:10.31577/CAOSP.2020.50.3.672

V. Andreoli, U. Munari

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引用次数: 2

摘要

LAMOST J202629.80+423652.0最近被归类为一颗新的共生恒星，包含一颗长周期的Mira，被尘埃(d型)包围，在光谱中显示出高电离发射线，包括6825 Ang的拉曼散射OVI。我们对LAMOST J202629.80+423652.0在BVRI波段进行了光度观测，并在3500-8000 Ang范围内进行了光谱观测。我们发现它是一颗正常的G8IV次巨星，在其光谱中没有任何发射线，并且被E(B-V)=0.35等变红。结合我们的光度测量和全天巡天的数据，我们发现LAMOST J202629.80+423652.0是非可变的，因此不像Mira那样脉动。我们从现有的资料中整理了它的光谱能量分布，延伸到中红外，发现它完全由G8IV光球恒星发射主导，没有任何星周尘埃的迹象。因此，我们得出结论，LAMOST J202629.80+423652.0不是一颗共生恒星，它既没有脉动，也没有被尘埃包裹。

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LAMOST J202629.80+423652.0 is not a symbiotic star

LAMOST J202629.80+423652.0 has been recently classified as a new symbiotic star containing a long-period Mira, surrounded by dust (D-type) and displaying in the optical spectra high ionization emission lines, including the Raman-scattered OVI at 6825 Ang. We have observed LAMOST J202629.80+423652.0 photometrically in the BVRI bands and spectroscopically over the 3500-8000 Ang range. We have found it to be a normal G8IV sub-giant star, deprived of any emission line in its spectrum, and reddened by E(B-V)=0.35 mag. Combining our photometry with data from all-sky patrol surveys, we find LAMOST J202629.80+423652.0 to be non variable, so not pulsating as a Mira. We have compiled from existing sources its spectral energy distribution, extending well into the mid-Infrared, and found it completely dominated by the G8IV photospheric stellar emission, without any sign of circumstellar dust. We therefore conclude that LAMOST J202629.80+423652.0 is not a symbiotic star, nor it is pulsating or been enshrouded in dust.

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来源期刊

Contributions of the Astronomical Observatory Skalnate Pleso 地学天文-天文与天体物理

CiteScore

1.10

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Contributions of the Astronomical Observatory Skalnate Pleso" (CAOSP) is published by the Astronomical Institute of the Slovak Academy of Sciences (SAS). The journal publishes new results of astronomical and astrophysical research, preferentially covering the fields of Interplanetary Matter, Stellar Astrophysics and Solar Physics. We publish regular papers, expert comments and review contributions.