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arXiv 0908.0531astro-ph.GA
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正面螺旋星系中的行星状星云。II。行星状星云光谱学

Planetary Nebulae in Face-On Spiral Galaxies. II. Planetary Nebula Spectroscopy

Kimberly A. Herrmann, Robin Ciardullo

备注：
12 pages, 6 figures, 7 tables- 1 is mostly on-line only; accepted to ApJ
发表信息：
Astrophysical Journal 703 (2009) 894-904
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摘要：

作为螺旋盘质光比研究的第二步，我们给出了对附近5个低倾角星系IC 342、M74（NGC 628）、M83（NGC 5236）、M94（NGC 4736）和M101（NGC 5457）中行星状星云（PNe）的光谱观测结果。使用WIYN/Hydra和Blanco/Hydra光谱仪的50个设置，以及Hobby-Eberly望远镜的中分辨率光谱仪的25次观测，我们分别确定了99，102，162，127和48 PNe的径向速度，精度优于15 km/s。虽然这个数据集的主要目的是为了促进大螺旋星系的内外盘的动态质量测量，我们的光谱学也有其他用途。在这里，我们共同添加这些光谱，以表明一阶，[O III]和巴耳末线比的行星状星云的变化很小的顶部~1.5等的行星状星云光度函数。唯一明显的光谱变化发生在[N II]，它的强度随着光度函数的下降而增加。我们还表明，典型的[O III]-明亮的行星有E（B-V）~ 0.2的星周消光，这个值几乎是独立的[O III]光度。我们讨论的影响，这对理解PN祖细胞的人口。

英文摘要：

As the second step in our investigation of the mass-to-light ratio of spiral disks, we present the results of a spectroscopic survey of planetary nebulae (PNe) in five nearby, low-inclination galaxies: IC 342, M74 (NGC 628), M83 (NGC 5236), M94 (NGC 4736), and M101 (NGC 5457). Using 50 setups of the WIYN/Hydra and Blanco/Hydra spectrographs, and 25 observations with the Hobby-Eberly Telescope's Medium Resolution Spectrograph, we determine the radial velocities of 99, 102, 162, 127, and 48 PNe, respectively, to a precision better than 15 km/s. Although the main purpose of this data set is to facilitate dynamical mass measurements throughout the inner and outer disks of large spiral galaxies, our spectroscopy has other uses as well. Here, we co-add these spectra to show that to first order, the [O III] and Balmer line ratios of planetary nebulae vary little over the top ~1.5 mag of the planetary nebula luminosity function. The only obvious spectral change occurs with [N II], which increases in strength as one proceeds down the luminosity function. We also show that typical [O III]-bright planetaries have E(B-V) ~ 0.2 of circumstellar extinction, and that this value is virtually independent of [O III] luminosity. We discuss the implications this has for understanding the population of PN progenitors.

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