O star

American  

[oh stahr] / ˈoʊ ˌstɑr /

noun

1. a very hot, massive, blue star of spectral type O, having a surface temperature between 30,000 and 50,000 K and an absorption spectrum with few lines, though the Balmer series of hydrogen lines is present and lines of ionized helium are detectable.

---

Example Sentences

Our Sun, a type G star, has a surface temperature of 5800 K. We know, therefore, that it is cooler than a type O star and hotter than a type M star.

From Textbooks • Oct. 13, 2016

Estimating the luminosity class of an M star is much more important than measuring it for an O star if you are determining the distance to that star.

From Textbooks • Oct. 13, 2016

Given what you learned about the temperature ranges of these types of stars, how many times hotter than our Sun is the hottest type O star?

From Textbooks • Oct. 13, 2016

Now, O star of women, show me how Juno goes among the gods, or Helen for whom Troy was destroyed.

From Poets and Dreamers Studies and translations from the Irish by Gregory, Lady

O star of dearth Darkly illumining a nation's grief!

From Poems — Volume 1 by Meredith, George