Chemical Abundances of Planetary Nebulae Towards the Galactic Anticenter
Chemical Abundances of Planetary Nebulae Towards the Galactic Anticenter
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DOI：
10.1051/0004-6361:20034539
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发表时间：
2004-05
期刊：
影响因子：
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通讯作者：
R. Costa;W. J. Maciel;Monica M.M. Uchida
中科院分区：
文献类型：
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作者：
R. Costa;W. J. Maciel;Monica M.M. Uchida
在本文中，我们报告了新的观测结果，并得出了位于反中心方向的26个行星状星云（PN）的样品的化学丰度。这些星云大多数都是遥远的天体，位于银河系中心距离大于8 kpc的地方，因此它们对于确定距离银河系中心很远的径向梯度特别有用。本结果与先前确定的丰度的比较表明，径向丰度梯度变平的距离大于约10千秒差距的中心。
In this paper we report new observations and derive chemical abundances for a sample of 26 planetary nebulae (PN) located in the anticenter direction. Most of these nebulae are far away objects, located at Galactocentric distances greater than about 8 kpc, so that they are particularly useful for the determination of the radial gradients at large distances from the galactic center. A comparison of the present results with previously determined abundances suggests that the radial abundance gradients flatten out at distances larger than about 10 kpc from the center.