arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.14749astro-ph.SR
收藏

恒星形成区NGC2264中的褐矮星星群

The brown dwarf population in the star forming region NGC2264

Samuel Pearson, Aleks Scholz, Paula S Teixeira, Koraljka Mužić, Jochen Eislöffel

摘要:

到目前为止,对标准恒星形成区NGC 2264中的褐矮星群的探索还很有限。我们提出了一个深,多波长,多历元的恒星形成集群NGC 2264的调查,旨在确定年轻的褐矮星候选人在这个地区。使用包括光学/近红外颜色,可变性,斯皮策中红外颜色过剩,消光,盖亚视差和自行(按相关性顺序)的标准,我们选择了902个具有年轻指标的微弱红色光源。在这个样本中,我们根据它们的红外颜色确定了429颗褐矮星候选者。这些褐矮星候选者的质量范围估计在0.01到0.08 $M_{\odot}$之间。我们发现旋转周期为44个来源,其中15个是褐矮星候选人,从3.6小时到6.5天不等。一个由38颗褐矮星候选者组成的子集显示出高水平的不规则变化,表明正在进行的盘吸积,类似于年轻恒星的行为。

英文摘要:

The brown dwarf population in the canonical star forming region NGC2264 is so far poorly explored. We present a deep, multi-wavelength, multi-epoch survey of the star forming cluster NGC2264, aimed to identify young brown dwarf candidates in this region. Using criteria including optical/near-infrared colours, variability, Spitzer mid-infrared colour excess, extinction, and Gaia parallax and proper motion (in order of relevance), we select 902 faint red sources with indicators of youth. Within this sample we identify 429 brown dwarf candidates based on their infrared colours. The brown dwarf candidates are estimated to span a mass range from 0.01 to 0.08$M_{\odot}$. We find rotation periods for 44 sources, 15 of which are brown dwarf candidates, ranging from 3.6 hours to 6.5 days. A subset of 38 brown dwarf candidates show high level irregular variability indicative of ongoing disc accretion, similar to the behaviour of young stars.

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。

↑