星周物质

分析认为我们观测到的是大角星的一次以天计的短时标色球剧烈活动，它伴随着物质的向外抛射，也引起星周物质的向外运动。

Our conclusion is that we happened to observe an intensive short time-scale activity of the chromosphere of Arcturus characterized by mass outflow and outward motions of circumstellar matter .

这两类星都有一个共同的特性&具有过量的红外辐射，或称为红外超。红外超不是由中心恒星产生，而是由星周物质产生。

A common character in these two group stars is presence of infrared excess , which is not attributed to the central star , but its circumstellar material .

我们发现，在远红外有几颗星和在近红外有一些星的红外超是由星周电离物质的自由-自由和自由-束缚发射产生。

It can be found that , for few stars in far infrared region and some stars in near infrared region , infrared excesses are attributed to the free-free and / or free-bound radiation from the circumstellar ionized gas .