arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2010.02403astro-ph.SR
收藏

用高分辨光谱学揭示猎户座天体FU Mon的光谱变化

Revealing the spectroscopic variations of FU Orionis object V960 Mon with high-resolution spectroscopy

Yuhei Takagi, Satoshi Honda, Akira Arai, Jun Takahashi, Yumiko Oasa, Yoichi Itoh

摘要:

我们介绍了猎户座FU型恒星V960 Mon的高分辨率光谱学的结果。V960 Mon的亮度在2014年11月被发现后持续下降。在这次变暗事件中,我们进行了中等分辨率的光谱监测观测,发现吸收特征的等效宽度显示出变化。为了进一步研究光谱变化,我们在2018年1月8日和2020年2月1日使用斯巴鲁望远镜和高色散光谱仪对V960 Mon进行了高分辨率光谱观测。通过将该光谱与凯克天文台和高分辨率中阶梯光谱仪在2014年至2017年期间拍摄的档案数据进行比较,我们发现吸收曲线随着V960 Mon的褪色而变化。Fe I和Ca I等吸收线的谱线轮廓可以用盘状大气和中心恒星的光谱之和来解释。为解释谱线轮廓的变化而创建的模型光谱表明,中心恒星的有效温度为$\sim$ 5500 K,这与盖亚距离为1.6 kpc的爆发前阶段相当。光谱还表明,盘大气的有效温度随着V960 Mon的减弱而降低。H $α$和Ca II谱线(8498.0 A,8542.1 A)的变化也表明V960 Mon谱成为中心星的优势。

英文摘要:

We present the results of the high-resolution spectroscopy of the FU Orionis-type star V960 Mon. The brightness of V960 Mon decreased continuously after the outburst was detected in 2014 November. During this dimming event, we have carried out medium-resolution spectroscopic monitoring observations and found that the equivalent width of the absorption features showed variations. To further investigate the spectroscopic variations, we conducted a high-resolution spectroscopic observation of V960 Mon with the Subaru Telescope and the High Dispersion Spectrograph on 2018 January 8 and 2020 February 1. By comparing this spectrum with the archival data of the Keck Observatory and the High Resolution Echelle Spectrometer taken between 2014 and 2017, we found that the absorption profiles changed as V960 Mon faded. The line profile of absorption lines such as Fe I and Ca I can be explained by a sum of the spectra of the disk atmosphere and the central star. The model spectrum created to explain the variations of the line profiles suggests that the effective temperature of the central star is $\sim$5500 K, which is comparable to that of the pre-outburst phase with a distance of 1.6 kpc with Gaia. The spectrum also shows that the effective temperature of the disk atmosphere decreased as V960 Mon faded. The variations of the H$α$ and Ca II lines (8498.0 A, 8542.1 A) also show that the V960 Mon spectrum became central-star dominant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑