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Massive Stars in Molecular Clouds Rich in High-energy Sources: The Bridge of G332.809–0.132 and CS 78 in NGC 6334
The Astronomical Journal ( IF 5.1 ) Pub Date : 2020-07-15 , DOI: 10.3847/1538-3881/ab9950
Maria Messineo 1 , Karl M. Menten 2 , Donald F. Figer 3 , J. Simon Clark 4
Affiliation  

Detections of massive stars in the direction of the H II region CS 78 in NGC 6334 and of G332.809-0.132 are here presented. The region covered by the G332.809-0.132 complex coincides with the RCW 103 stellar association. In its core (40' in radius), approximately 110 OB candidate stars (Ks < 10 mag and 0.4 < AKs < 1.6 mag) were identified using 2MASS, DENIS, and GLIMPSE data. This number of OB stars accounts for more than 50% of the observed number of Lyman continuum photons from this region. Medium-resolution K-band spectra were obtained for seven early types, including one WN 8 star and one Ofpe/WN 9 star; the latter is located near the RCW 103 remnant and its luminosity is consistent with a distance of about 3 kpc. The area analyzed encloses 9 of the 34 OB stars previously known in RCW 103, as well as IRAS 16115-5044, which we reclassify as a candidate luminous blue variable. The line of sight is particularly interesting, crossing three spiral arms; a molecular cloud at -50 (with RCW 103 in the Scutum-Crux arm) and another at -90 km s-1 (in the Norma arm) are detected, both rich in massive stars and supernova remnants. We also report the detection of a B supergiant as the main ionizing source of CS 78, 2MASS J17213513-3532415. Medium-resolution H and K band spectra display H I and He I lines, as well as Fe II lines. By assuming a distance of 1.35 kpc, we estimate a bolometric magnitude of -6.16, which is typical of supergiants.

中文翻译:

富含高能源的分子云中的大质量恒星:NGC 6334 中 G332.809-0.132 和 CS 78 的桥梁

这里介绍了在 NGC 6334 和 G332.809-0.132 的 H II 区域 CS 78 方向上检测到的大质量恒星。G332.809-0.132 复合体覆盖的区域与 RCW 103 星协重合。在其核心(半径 40')中,使用 2MASS、DENIS 和 GLIMPSE 数据确定了大约 110 颗 OB 候选恒星(Ks < 10 mag 和 0.4 < AKs < 1.6 mag)。这个 OB 星的数量占该区域观测到的莱曼连续光子数量的 50% 以上。获得了七种早期类型的中等分辨率 K 波段光谱,包括一颗 WN 8 星和一颗 Ofpe/WN 9 星;后者位于RCW 103残骸附近,其光度与约3 kpc的距离一致。分析的区域包含了先前在 RCW 103 中已知的 34 颗 OB 星中的 9 颗,以及 IRAS 16115-5044,我们将其重新分类为候选发光蓝色变量。视线特别有趣,交叉着三个旋臂;探测到一个位于 -50 的分子云(在 Scutum-Crux 臂中有 RCW 103)和另一个位于 -90 km s-1(在 Norma 臂)的分子云,它们都富含大质量恒星和超新星遗迹。我们还报告了检测到 B 超巨星作为 CS 78 的主要电离源,2MASS J17213513-3532415。中等分辨率 H 和 K 波段光谱显示 HI 和 He I 谱线,以及 Fe II 谱线。通过假设距离为 1.35 kpc,我们估计热辐射星等为 -6.16,这是超巨星的典型特征。探测到一个位于 -50 的分子云(在 Scutum-Crux 臂中有 RCW 103)和另一个位于 -90 km s-1(在 Norma 臂)的分子云,它们都富含大质量恒星和超新星遗迹。我们还报告了检测到 B 超巨星作为 CS 78 的主要电离源,2MASS J17213513-3532415。中等分辨率 H 和 K 波段光谱显示 HI 和 He I 谱线,以及 Fe II 谱线。通过假设距离为 1.35 kpc,我们估计热辐射星等为 -6.16,这是超巨星的典型特征。探测到一个位于 -50 的分子云(在 Scutum-Crux 臂中有 RCW 103)和另一个位于 -90 km s-1(在 Norma 臂)的分子云,都富含大质量恒星和超新星遗迹。我们还报告了检测到 B 超巨星作为 CS 78 的主要电离源,2MASS J17213513-3532415。中等分辨率的 H 和 K 波段光谱显示 HI 和 He I 谱线,以及 Fe II 谱线。通过假设距离为 1.35 kpc,我们估计热辐射星等为 -6.16,这是超巨星的典型特征。
更新日期:2020-07-15
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