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首页> 外文期刊>The Astrophysical journal >THE Mg II AND Lyα LINES OF NEARBY K DWARFS : INTERSTELLAR MEDIUM COMPONENTS AND FLUX MEASUREMENTS
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THE Mg II AND Lyα LINES OF NEARBY K DWARFS : INTERSTELLAR MEDIUM COMPONENTS AND FLUX MEASUREMENTS

机译：附近K矮星的Mg II和Lyα谱线：星际中分量和通量测量

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摘要

We analyze local interstellar medium (LISM) absorption observed in the Lyα and Mg II h and k lines of six nearby K dwarf stars, using UV spectra of these stars obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope. For four of the six stars, we detect an absorption com- ponent with a velocity and column density consistent with the Local Interstellar Cloud (LIC). For HD 197890, there is no observed component at the expected LIC velocity or at the projected velocity of the G cloud, which is a nearby cloud in the general direction of the Galactic center. lt also seems doubtful that either of the two components seen toward HD 82558 are LIC or G cloud absorption. The total H I column density toward HD 82558 (d = 18.3 pc) is extremely high (log NH = 19.05 ± 0.15), representing the largest average H I density detected for any line of sight through the nearby LISM (nH ≈re 0.2 cm~-3). This is particularly remarkable considering that this star is only 39 deg. from the "interstellar tunnel" toward ∈CMa, where column densities are an order of magnitude lower than this toward stars that are an order of magnitude farther away.
机译：我们使用哈勃太空望远镜上的戈达德高分辨率光谱仪获得的这些星的紫外线光谱，分析了六颗附近K矮星的Lyα和Mg II h和k线的Lysa和Mg II h和k线中观测到的局部星际介质（LISM）的吸收。对于六颗星中的四颗，我们检测到的吸收分量的速度和列密度与本地星际云（LIC）一致。对于HD 197890，在预期的LIC速度或G云的投影速度（在银河系中心的大方向上是附近的云）中没有观测到分量。对HD 82558看到的两个分量中的任何一个都可能是LIC或G云吸收，这似乎也令人怀疑。朝向HD 82558（d = 18.3 pc）的总HI柱密度极高（对数NH = 19.05±0.15），代表通过附近LISM的任何视线检测到的最大平均HI密度（nH≈re0.2 cm〜-） 3）。考虑到这颗恒星只有39度，这是特别值得注意的。从“星际隧道”向εCMa方向移动，其中列密度比向着更远一个数量级的恒星低一个数量级。

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