Milky Way rotation and the distance to the Galactic center from Cepheid variables
Milky Way rotation and the distance to the Galactic center from Cepheid variables
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DOI：
10.1007/3-540-19484-3_8
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发表时间：
1987-05
期刊：
影响因子：
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通讯作者：
J. Caldwell;I. Coulson
中科院分区：
文献类型：
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作者：
J. Caldwell;I. Coulson
银河系造父变星的现有数据是用轴对称银河系旋转模型拟合的。确定了一种新的“标准烛线”：具有标准周期、颜色和金属丰度的假想造父变星在 1 Ro 距离处的未红视星等。由此可见，距造父变星团零点的 Ro = 7.8 ± 0.7 kpc。更重要的结果是 2AR0= 228 ± 19 km s−1，并且观测到的造父变星平均速度平均为 3.1 ± 0.9 km s−1，与质心速度相比太负。
The existing data on Milky Way Cepheids are fitted with an axisymmetric Galactic rotation model. A new “standard candle” mois determined: the unreddened apparent magnitude of a hypothetical Cepheid with standard period, color, and metallicity at a distance of 1 Ro. It then follows that Ro = 7.8 ± 0.7 kpc from the cluster Cepheid zero point. Further important results are that 2AR0= 228 ± 19 km s−1, and that the observed Cepheid mean velocities average 3.1 ± 0.9 km s−1too negative compared with the center-of-mass velocities.