光学对应体 meaning in Chinese

optical counterpart

No optical counterpart has been observed .
没有观测到光学对应体。
The extreme carbon stars , whose derived mass loss rates and optical depths are both very high , are more evolved than infrared carbon stars . these stars are expected to evolve into protoplanatary nebula soon
极端碳星是高度演化后的红外碳星，它的质量损失率及光深都非常高，几乎没有其光学对应体，并将很快演化为前行星状星云。