首页> 美国政府科技报告 >Effect of Rotation on Calibrators for Ground-based Interferometry.
【24h】

Effect of Rotation on Calibrators for Ground-based Interferometry.

机译:旋转对校准器地面干涉测量的影响。

获取原文

摘要

We consider the problem introduced by rotation in the use of early- type stars as calibrators for optical interferometry. These objects have high surface brightnesses and hence are relatively bright, even with small angular diameters. However, rotation can introduce changes in the predicted visibilities well in excess of the uncertainties in the various diameter- magnitude-color calibrations. Measurements of the projected rotational velocity constrain these effects, but the constraints are complicated and not easily evaluated when selecting potential calibrators. Furthermore, the magnitude of the variations depends on the details of the interferometer,such as latitude, baseline length, and operating wavelength. Nevertheless, using measured magnitudes, colors parallaxes, and projected rotational velocities, and estimating masses from standard evolutionary grids, we are able to calculate histograms that approximate the probability distribution of the visibilities and allow us to characterize the width of the distribution of squared visibilities and the total range induced by rotation. We have found that proximity to the ZAMS adds a valuable constraint, allowing stars with moderate rotation to be reliable calibrators in a number of cases. Catalogs characterizing the sensitivity of the visibilities of potential calibrators to rotation are presented for a number of standard interferometer configurations.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号