Oxygen abundance in the Sloan Digital Sky Survey

Oxygen abundance in the Sloan Digital Sky Survey
复制标题

斯隆数字巡天中的氧气丰度

DOI:
10.1051/0004-6361:20054524
复制
发表时间:
2006-03
影响因子:
6.5
通讯作者:
Kong, X
Kong, X
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shi, F;Cheng, FZ;Kong, X

文献摘要

参考文献

被引文献

相似文献

目标。为了评估不同氧丰度指标之间可能存在的系统差异,并了解氮的起源和负责氮生产的恒星,我们从斯隆数字巡天(SDSS)光谱观测数据发布3中提供了两个H II星系样本。方法.用光电离H Ⅱ模型计算了225个星系的电子温度,用经验方法计算了3997个星系的电子温度。两个样品的T e方法的氧丰度是可靠的。还计算了来自强线金属丰度指示剂(如R23、P、N2和03 N2)的氧丰度。用Te方法、R23方法、P方法、N2方法和O3 N2方法对H Ⅱ星系的氧丰度进行了比较。结果与T e方法得到的氧丰度是系统地低于由R 23方法,与以前的研究H II区样品的基础上,由10.2德克斯比。在T e金属丰度与P、N2和03 N2金属丰度之间没有发现明显的氧丰度偏移。在研究N/O和O/H的关系时,我们发现在12 + log(O/H)> 7.95的金属丰度区,这种关系的大的分散性可以用小质量恒星对氮的产生的贡献来解释。在高金属丰度区,12 + log(O/H)> 8.2,氮主要是所有质量的恒星产生的次要元素。
Aims. To assess the possible systematic differences among different oxygen abundance indicators and understand the origin of nitrogen and the stars responsible for nitrogen production, we present two samples of H II galaxies from the Sloan Digital Sky Survey (SDSS) spectroscopic observations, data release 3. Methods. The electron temperatures (T e ) of 225 galaxies are calculated with the photoionized H II model and T e of 3997 galaxies are calculated with an empirical method. The oxygen abundances from the T e methods of the two samples are determined reliably. The oxygen abundances from a strong line metallicity indicator, such as R 23 , P, N2, and 03N2, are also calculated. We compared oxygen abundances of H II galaxies obtained .with the T e method, R 23 method, P method, N2 method, and O3N2 method. Results. The oxygen abundances derived with the T e method are systematically lower by ∼0.2 dex than those derived with the R 23 method, consistent with previous studies based on H II region samples. No clear offset for oxygen abundance was found between T e metallicity and P, N2 and 03N2 metallicity. When we studied the relation between N/O and O/H, we found that in the metallicity regime of 12 + log(O/H) > 7.95, the large scatter of the relation can be explained by the contribution of small mass stars to the production of nitrogen. In the high metallicity regime, 12 + log(O/H) > 8.2, nitrogen is primarily a secondary element produced by stars of all masses.
DOI: 10.1086/306708
发表时间: 1998-11
期刊: The Astrophysical Journal
影响因子: --
作者:
Y. Izotov;T. Thuan
通讯作者: Y. Izotov;T. Thuan
DOI: 10.1086/133637
发表时间: 1995-09
影响因子: 3.5
作者:
R. Shaw;R. Dufour
通讯作者: R. Shaw;R. Dufour
DOI: 10.1007/s001590000005
发表时间: 1999-11
期刊: The Astronomy and Astrophysics Review
影响因子: --
作者:
D. Kunth;G. Östlin
通讯作者: D. Kunth;G. Östlin
DOI: 10.1086/344761
发表时间: 2001-05
期刊: The Astronomical Journal
影响因子: --
作者:
M. Blanton;Huan Lin;R. Lupton;F. M. Maley;N. Young;I. Zehavi;J. Loveday
通讯作者: M. Blanton;Huan Lin;R. Lupton;F. M. Maley;N. Young;I. Zehavi;J. Loveday
DOI: 10.1046/j.1365-8711.2002.05042.x
发表时间: 2001-09
影响因子: 4.8
作者:
T. Contini;M. Treyer;M. Sullivan;R. Ellis
通讯作者: T. Contini;M. Treyer;M. Sullivan;R. Ellis