首页     开始     To Survive in the Universe    
Inhabited Sky
    News@Sky     天文图片     收集     论坛     Blog New!     常见问题     新闻     登录  

HD 1260


目录

图像

上传图像

DSS Images   Other Images


相关文章

Discovery of Spectroscopic Variations in the DAB White Dwarf GD 323
We report the discovery of spectroscopic variations in GD 323, theprototypical DAB white dwarf. Simultaneous optical spectroscopicobservations over five consecutive nights of GD 323 and PG 1234+482, anonvariable comparison DA white dwarf of similar brightness, are used toreveal quasi-periodic variations in both the hydrogen and heliumabsorption lines over a timescale of hours. The amplitude of thevariation of the equivalent width of Hβ is ~30%. Moreover, thestrength of the hydrogen lines is shown to vary in opposite phase fromthat of He I λ4471. These results suggest that the modelcurrently thought to be the most viable to account for the simultaneouspresence of hydrogen and helium lines in GD 323, namely, a staticstratified atmosphere, may need to be reexamined. Instead, a model withan inhomogeneous surface composition, resulting perhaps from thedilution of a thin hydrogen atmosphere with the underlying heliumconvection zone, may be a better representation of GD 323. The observedvariation timescale of ~3.5 hr is consistent with the slow rotation rateof white dwarf stars.

提交文章


相关链接

  • - 没有找到链接 -
提交链接


下列团体成员


观测天体数据

星座:杜鵑座
右阿森松:00h16m31.49s
赤纬:-66°41'24.3"
视星:7.736
距离:179.856 天文距离
右阿森松适当运动:59.1
赤纬适当运动:24.9
B-T magnitude:9.249
V-T magnitude:7.861

目录:
适当名称   (Edit)
HD 1989HD 1260
TYCHO-2 2000TYC 8846-510-1
USNO-A2.0USNO-A2 0225-00073072
HIPHIP 1312

→ 要求更多目录从vizier