4.6 Article

The nature of the 2014-2015 dim state of RW Aurigae revealed by X-ray, optical, and near-IR observations

期刊

ASTRONOMY & ASTROPHYSICS
卷 584, 期 -, 页码 -

出版社

EDP SCIENCES S A
DOI: 10.1051/0004-6361/201527237

关键词

stars: individual: RW Aur; stars: pre-main sequence; stars: low-mass; stars: variables: T Tauri, Herbig Ae/Be; X-rays: stars

资金

  1. NASA [NAS8-03060]
  2. STFC/Isaac Newton Trust studentship
  3. National Aeronautics and Space Administration (NASA) [NNH14CK55B]
  4. [NASA-HST-GO-12315.01]
  5. Science and Technology Facilities Council [1233330] Funding Source: researchfish

向作者/读者索取更多资源

The binary system RW Aur consists of two classical T Tauri stars (CTTSs). The primary recently underwent its second observed major dimming event (Delta V similar to 2 mag). We present new, resolved Chandra X-ray and UKIRT near-IR (NIR) data as well as unresolved optical photometry obtained in the dim state to study the gas and dust content of the absorber causing the dimming. The X-ray data show that the absorbing column density increased from N-H < 0.1 x 10(22) cm(-2) during the bright state to approximate to 2 x 10(22) cm(-2) in the dim state. The brightness ratio between dim and bright state at optical to NIR wavelengths shows only a moderate wavelength dependence and the NIR color-color diagram suggests no substantial reddening. Taken together, this indicates gray absorption by large grains (greater than or similar to 1 mu m) with a dust mass column density of greater than or similar to 2 x 10(-4) g cm(-2). Comparison with N-H shows that an absorber responsible for the optical/NIR dimming and the X-ray absorption is compatible with the ISM's gas-to-dust ratio, i.e., that grains grow in the disk surface layers without largely altering the gas-to-dust ratio. Lastly, we discuss a scenario in which a common mechanism can explain the long-lasting dimming in RW Aur and recently in AA Tau.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据