短周期x射线双星UW CrB中的瞬态紫外线流出

Q1 Earth and Planetary Sciences
S Fijma, N Castro Segura, N Degenaar, C Knigge, N Higginbottom, J V Hernández Santisteban, T J Maccarone
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引用次数: 0

摘要

吸积的低质量x射线双星(lmxb)能够发射强大的外流,如吸积盘风。在圆盘风中,大量的物质可以被带走,潜在地极大地影响双星及其环境。先前的研究已经发现了签名的圆盘风x射线光学、近红外,甚至最近紫外线(UV)乐队,主要在LMXB大光盘(Porb≥20 h)。在这里,我们报告的发现瞬态紫外线流出特性在威斯康辛大学CrB,一个高倾角(我≥77°)中子星LMXB (NS-LMXB)的轨道周期只有Porb≈111分钟。我们现在P-Cygni概要文件为第四Si 1400和初步确定N v 1240一分之一15分钟曝光,这是唯一覆盖轨道相位φ≈0.7-0.8,速度≈1500 km s−1的曝光。我们表明,由于来自中子星表面和/或边界层的黑体发射的存在,尽管短Porb也可以驱动热盘风,但也探索了其他情景。发现热盘风可能发生在ns - lmxb中,其波速小至≈111分钟,并且可能在短至≈15分钟的时间尺度上是短暂的,这需要进一步的观测和理论工作。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A transient ultraviolet outflow in the short-period X-ray binary UW CrB
ABSTRACT Accreting low-mass X-ray binaries (LMXBs) are capable of launching powerful outflows such as accretion disc winds. In disc winds, vast amounts of material can be carried away, potentially greatly impacting the binary and its environment. Previous studies have uncovered signatures of disc winds in the X-ray, optical, near-infrared, and recently even the ultraviolet (UV) band, predominantly in LMXBs with large discs (Porb ≥ 20 h). Here, we present the discovery of transient UV outflow features in UW CrB, a high-inclination (i ≥ 77°) neutron star LMXB (NS-LMXB) with an orbital period of only Porb ≈ 111 min. We present P-Cygni profiles identified for Si iv 1400 Å and tentatively for N v 1240 Å in one 15 min exposure, which is the only exposure covering orbital phase ϕ ≈ 0.7–0.8, with a velocity of ≈1500 km s−1. We show that due to the presence of blackbody emission from the neutron star surface and/or boundary layer, a thermal disc wind can be driven despite the short Porb, but explore alternative scenarios as well. The discovery that thermal disc winds may occur in NS-LMXBs with Porb as small as ≈111 min, and can potentially be transient on time-scales as short as ≈15 min, warrants further observational and theoretical work.
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来源期刊
Monthly Notices of the Royal Astronomical Society: Letters
Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science
CiteScore
8.80
自引率
0.00%
发文量
136
期刊介绍: For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.
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