South galactic cap G and K stars with infrared excesses
South galactic cap G and K stars with infrared excesses
复制标题
南银河帽 G 和 K 星具有红外线过量
DOI：
10.1093/mnras/250.3.638
复制
发表时间：
1991
影响因子：
4.8
通讯作者：
F. Marang
中科院分区：
文献类型：
--
作者：
P. Whitelock;J. Menzies;R. Catchpole;M. Feast;G. Roberts;F. Marang
Near-infrared andIRASphotometry is discussed for 13 G and K stars in the south galactic cap. Five of them show a strong flux excess at 12μm as would be expected from dust shells emitting at temperatures of several hundred Kelvin. One of them (XY Tau) has previously been classified as a 206-d Mira, but the new observations suggest it is actually a variable F or G star. The most likely explanation is that the original classification was wrong and that it is in fact a pre-main-sequence star. The other four stars are either in very unusual evolutionary states or they are binary systems.The presence of long-term variations in the near-infrared flux of the flare star CC Eri is reported. The colors are redder when the star is fainter, and the variations might be associated with the star spot cycle.
