论文标题
对近红外弥漫性星际乐队的高分辨率研究，寻找小规模结构，时间可变性和出色的特征
A high resolution study of near-IR diffuse interstellar bands, search for small scale structure, time variability and stellar features
论文作者
论文摘要
弥散的星际条带包含ISM中数百种吸收特征。在光学中观察到大多数DIB，但有些在IR中。我们观察到76个早期型恒星，r = 50,000，使用CRIRE的数百个恒星。我们测量1318、1527、1561、1565、1567、1574和/或/或1624 nm左右的DIB。我们检测到总共6个DIB功能和17个可能由CMFGEN模型辅助的恒星特征。我们还使用X射击器朝十个CEPH测量了1318和1527 nm的DIB。 3.2 <e（b-v）<6.5和4颗恒星的变量在水蒸气的低值下。 相关系数。发现比较Nirdib等式的0.73-0.96。当比较NIR和光学DIB 5705、5780、6203、6283和6269A时，宽度与E（B-V）和r> 0.8 A. 5797 A DIB与NIDIB的相关性较小。 9632 A处的“ C60+” DIB与1318 nm DIB的相关性不很好。还确定了使用E（B-V）作为协变量的部分相关系数。对于早于B2的恒星，1318 nm的DIB受其蓝翼上的发射线的影响，这可能是本质上的恒星，尽管我们不能排除星际/情节起源，例如由DIB发射中的DIB引起的。 1318 nm Dib具有红色机翼，并且由两个高斯人合理地安装。组分比和分离都没有与5780/5797或E（B-V）相关。 EW（1318 nm）与HI与EW（1318 nm）/E（B-V）与F（H2）降低相关。 凌晨1点以内的五对恒星显示出相似的1318 nm DIB曲线。在HD 145501/145502和HD 168607/168625对中可见1318 nm的变化。分析了17颗恒星的CRIRES数据，分别分别为6-14个月，分析了2个X射击手视线，分别为9.9年。在5780、5797 A，1318 nm或1527 nm dibs中未检测到时间变量。在9577的C60+ DIB和9632 A向HD 183143的C60+ DIB中观察到暂定时间变化，尽管所需的确认很接近噪声水平。
Diffuse interstellar bands comprise hundreds of absorption features in the ISM. Most DIBs are observed in the optical, but some are in the IR. We observed 76 early-type stars at R=50,000 and S/N ratios of several hundreds using CRIRES. We measure DIBs around 1318, 1527, 1561, 1565, 1567, 1574 and/or 1624 nm. We detect a total of 6 DIB features and 17 likely stellar features assisted by a CMFGEN model. We also measured the DIBs at 1318 and 1527 nm using X-shooter towards ten Ceph. variables with 3.2 < E(B-V) < 6.5 and 4 stars at low values of water vapour. Correlation coeffs. of 0.73-0.96 are found comparing NIRDIB eq. width vs. E(B-V) and with r > 0.8 when comparing the NIR and optical DIBs 5705, 5780, 6203, 6283 and 6269 A. The 5797 A DIB is less well correlated with the NIDIBs. The "C60+" DIB at 9632 A is not well correlated with the 1318 nm DIB. Partial correlation coefficients using E(B-V) as the covariate were also determined. For stars earlier than B2, the 1318 nm DIB is affected by an emission line on its blue wing, likely stellar in nature, although we cannot rule out interstellar/circumstellar origin for example caused by by a DIB in emission. The 1318 nm DIB has a red wing and is reasonably well fitted by two gaussians. Neither the component ratios nor separation are correlated with 5780/5797 or E(B-V). EW(1318 nm) correlates with HI with EW(1318 nm)/E(B-V) decreasing with f(H2). Five pairs of stars within 1 am show similar 1318 nm DIB profiles. Variation in 1318 nm is seen in HD 145501/145502 and HD 168607/168625 pairs. CRIRES data for 17 stars separated by 6-14 months and 2 X-shooter sightlines separated by 9.9 yr were analysed. No time-variability is detected in the 5780, 5797 A, 1318 nm or 1527 nm DIBs. Tentative time variation is observed in the C60+ DIBs at 9577 and 9632 A towards HD 183143 although very close to the noise level with confirmation required.
