造父变星作为银河系盘面金属丰度梯度的示踪物
天体物理学
2007-11-27 v1
摘要
我们基于高分辨率光谱测量了 34 颗银河系造父变星的铁丰度,并基于近红外测光确定了其精确距离。利用新数据约束了外盘(即 10 至 14 kpc 范围内)的银河系铁丰度梯度。我们证实了梯度在外盘区域趋于平坦。在该区域,我们还发现金属丰度弥散度有所增加。现有数据不支持在银心距约 10-12 kpc 处金属丰度梯度存在突变的观点。
引用
@article{arxiv.0711.3988,
title = {Cepheids as tracers of the metallicity gradient across the Galactic disk},
author = {B. Lemasle and A. Piersimoni and S. Pedicelli and G. Bono and P. Francois and F. Primas and M. Romaniello},
journal= {arXiv preprint arXiv:0711.3988},
year = {2007}
}
备注
5 pages, 2 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proceeding Cefalu' Workshop "XXI Century Challenges for Stellar Evolution", ed. S. Cassisi & M. Salaris)