Diffuse interstellar bands in M 33
Diffuse interstellar bands in M 33
复制标题
M 33 中的弥漫星际带
DOI：
10.1051/0004-6361:200810906
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发表时间：
2008
影响因子：
6.5
通讯作者：
Cordiner M
中科院分区：
文献类型：
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作者：
Cordiner M
目的研究本星团旋涡星系M 33星际介质中的弥散星际带(DIB)光谱。方法利用W.M.Keck天文台的DEIMOS光谱仪在~30 0 0倍分辨率下拍摄了M 33超巨星J013346.96+303642.8的光谱。结果首次探测和测量了M 33中的DIB。检测到λλ5705、5780、5797、6203、6269、6283和6613DIB的速度与M 33吸收线相匹配。暂时检测到λ4428DIB。恒星光谱被归类为A3-Ia，并推导出视距星际变红。给出了弥散星际带(DIB)的等效宽度和径向速度。结论在M 33中观测到的DIB的总光谱与在银河系中观测到的相似。然而，沿着这条视线，每单位变红的M 33相当于Dib的宽度比通常在银河系中观察到的要大。
AimsWe investigate the diffuse interstellar band (DIB) spectrum in the interstellar medium of the Local Group spiral galaxy M 33.MethodsOptical spectra of the M 33 supergiant star J013346.96+303642.8 were taken at a resolving power of ~3000 using the DEIMOS spectrograph of the W. M. Keck Observatory.ResultsWe report the first detection and measurement of DIBs in M 33. Theλλ5705, 5780, 5797, 6203, 6269, 6283, and 6613 DIBs are detected at velocities matching the M 33 $\ion{Na}{i}$ absorption lines. Theλ4428 DIB is tentatively detected. The stellar spectrum is classified as A3 Ia and the line-of-sight interstellar reddening is derived. Diffuse interstellar band (DIB) equivalent widths and radial velocities are presented.ConclusionsThe overall spectrum of DIBs observed in M 33 is found to be similar to that observed in the Milky Way. However, along this line-of-sight, the M 33 DIB equivalent widths per unit reddening are large compared with those typically observed in the Galaxy.
星际 Na I、Ca II 和 K I 吸收的比较
DOI：
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发表时间：
1974
期刊：
影响因子：
--
作者：
L. Hobbs
通讯作者：
L. Hobbs