arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.2983astro-ph.GA
收藏

候选发光蓝变星G79 .29+0.46:通过多波长分析对其喷出物的综合研究

The candidate luminous blue variable G79.29+0.46: a comprehensive study of its ejecta through a multiwavelength analysis

C. Agliozzo, A. Noriega-Crespo, G. Umana, N. Flagey, C. Buemi, A. Ingallinera, C. Trigilio, P. Leto

摘要:

我们提出了一个多波长分析的候选人发光的蓝色变量G79.29+0.46周围的星云。这项研究是基于我们在扩展甚大阵列和绿岸望远镜上进行的无线电观测以及档案红外数据集,包括赫歇尔空间天文台获得的最新图像。我们确认,无线电中心对象的特点是恒星风,并得出目前的质量损失率约为1.4x10-6 Msun yr-1。我们发现在恒星附近有一个尘埃致密的包层,温度在40到1200 K之间。我们估计外喷出物的电离气体质量为1.51 Msun和温暖(60- 85 K)的尘埃质量为0.02 Msun。远红外光谱的诊断表明电离气体周围存在光解离区域。最后,我们模拟星云的光电离代码云,作为输入参数,从我们的分析估计。我们发现中心恒星的光度为10^5.4 Lsun,有效温度为20.4 kK。

英文摘要:

We present a multiwavelength analysis of the nebula around the candidate luminous blue variable G79.29+0.46. The study is based on our radio observations performed at the Expanded Very Large Array and at the Green Bank Telescope and on archival infrared datasets, including recent images obtained by the Herschel Space Observatory. We confirm that the radio central object is characterized by a stellar wind and derive a current mass-loss rate of about 1.4x10-6 Msun yr-1. We find the presence of a dusty compact envelope close to the star, with a temperature between 40 and 1200 K. We estimate for the outer ejecta an ionised gas mass of 1.51 Msun and a warm (60--85 K) dust mass of 0.02 Msun. Diagnostics of the far-infrared spectra indicate the presence of a photo-dissociation region around the ionised gas. Finally, we model the nebula with the photo-ionization code CLOUDY, using as input parameters those estimated from our analysis. We find for the central star a luminosity of 10^5.4 Lsun and an effective temperature of 20.4 kK.

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。

↑