...are bright, far exceeding the Sun ; and all the very faint stars, — for example, those less than ^0 as bright as the Sun, — are red, and of Classes...apparent exception is the faint double companion to o2 Eridani, concerning whose parallax and brightness there can be no doubt, but whose spectrum, though...

...of stars, which he named ' giants ' and ' dwarfs ' ; five years later the same astronomer remarked that there is a certain limit of brightness for each...of this class are very rare, if they occur at all. At the same time, Dr. HN Russell, of Princeton, commenced the series of investigations which he described...

...the Sun; and all the very faint stars,—for example, those less than A as bright as the Sun,—are red, and of Classes K and M. We may make this statement...apparent exception is the faint double companion to o 2 Eridani, concerning whose parallax and brightness there can be no doubt, but whose spectrum, though...

...red, and of Classes K and M. We may make this statement more specific by saying, as Hertzsprung does,1 that there is a certain limit of brightness for each...apparent exception is the faint double companion to cr- Eridani, concerning whose parallax and brightness there can be no doubt, but whose spectrum, though...