论文标题
使用光谱和多个上述光度法从Maxi J0709-159解码X射线耀斑
Decoding the X-ray flare from MAXI J0709-159 using optical spectroscopy and multi-epoch photometry
论文作者
论文摘要
我们介绍了一项随访研究，该研究对最近在HD 54786（LY CMA）方向的Maxi J0709-159中的Maxi/gsc观察中对两个X射线爆炸事件进行了检测，在2022年1月25日。 （nustar）耀斑之后。我们于2月1日至2日从印度的HCT和印度的VBT设施中捕获了低分辨率54786的低分辨率光谱。除了H-Alpha排放外，我们还发现了He I在该恒星光谱中的发射线。通过将我们的对象的频谱与文献中的频谱进行比较，我们发现他的线条显示出可变性。使用光度研究，我们估计该恒星的有效温度为20000K。尽管HD 54786在先前的研究中据报道是一项超级巨头，但我们的分析有利于它在颜色 - 磁性图中脱离主序列。我们无法检测到任何红外线过量，排除了尘土飞扬的圆盘盘排放的可能性。我们目前的研究表明，HD 54786是一个be/X射线二进制系统，具有紧凑的物体伴侣，可能是中子恒星。
We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/GSC observations in soft and hard X-rays from MAXI J0709-159 in the direction of HD 54786 (LY CMa), on 2022 January 25. The X-ray luminosity during the flare was around 10^(37) erg/s (MAXI), which got reduced to 10^(32) erg/s (NuSTAR) after the flare. We took low-resolution spectra of HD 54786 from HCT and VBT facilities in India, on 2022 February 1 and 2. In addition to H-alpha emission, we found emission lines of He I in the optical spectrum of this star. By comparing our spectrum of the object with those from literature we found that He I lines show variability. Using photometric study we estimate that the star is having effective temperature of 20000 K. Although HD 54786 is reported as a supergiant in previous studies, our analysis favours it to be evolving off the main sequence in the Color-Magnitude Diagram. We could not detect any infrared excess, ruling out the possibility of IR emission from a dusty circumstellar disc. Our present study suggests that HD 54786 is a Be/X-ray binary system with a compact object companion, possibly a neutron star.
