Assertion: nebula's star | /r/HasProperty | luminous
Facets:
value: very
type: DEGREE
value: of stellar classification types
type: OTHER
value: of spectral class o
type: OTHER
Source sentences:
text: The secondary star is hot and also highly luminous, probably of spectral class O, around 30–80 times as massive as the Sun.
text: Eta Carinae A would have begun life as an extremely hot star on the main sequence, already a highly luminous object over a million L ☉ .
text: These stars were hot and luminous and the ultraviolet light they emitted stripped electrons from interstellar hydrogen gas in all directions.
text: If the star is very luminous, of stellar classification types O and B, the stellar wind might excite hydrogen in the surrounding more "dilute" nebulosity, making it glow red from the Balmer H α excitation (the Balmer series represented by HII - H-roman-2), a kind of bright nebulosities, among others Orion Nebula (M42), Rosette Nebula, Eagle Nebula and such.
text: The bright star in the middle of the red cloud, called HD 278942, is so luminous that it is likely what is causing most of the surrounding ring to glow.
text: The superbubble structure of N44 itself is shaped by the radiation pressure of a 40-star group located near its center; the stars are blue-white, very luminous, and incredibly powerful.