...颗目标源的视向速度和元素的等值宽度,然后用前人提出的经验方法迭代计算并得到可靠的大气参数(有效温度(Teff)、表面重力(log g)、金属丰度[Fe/H]和微观湍流速度(ξt)),然后将大气参数及谱线的等值宽度输入所采用的大气模型中,从而得出了17种元素的丰度。
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另一类贫金属星,其质量和表面重力都相对偏小。
One is metal rich and relatively massive with large gravity, while another metal poor with lower mass and surface gravity.
飞往火星需要六个月。火星具有表面重力、稀薄的大气、冰冻的水、二氧化碳和基本矿物质。
Mars is a six-month flight away, and it has surface gravity, a thin atmosphere, frozen water, carbon dioxide and essential minerals.
所建议的分析方法能够考虑表面重力波的影响、水体可压缩性、水库上游辐射阻尼等各种因素作用。
The analysis method proposed can take into consideration of the effects of water surface gravity wave, water compressibility, and radiation damping at up-stream of reservoir.
For example, we know that if a body is near the surface of the Earth, the force of gravity of that object seems to be m times g, where g is 9.8.
例如,我们知道,如果在地球表面有一个物体,该物体受到的重力大小为 m 与 g 的乘积,g 等于 9.8
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