Noun
a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun
Source: WordNetIt is located 1100 light-years from Earth and has approximately 80 stars, the brightest of which is a red giant star of magnitude 5.2. Source: Internet
The star's spectrum is unusual in that it contains very strong emission lines resulting from surrounding nebulosity. citation W Cygni is a semi-regular variable red giant star, 618 light-years from Earth. Source: Internet
The detection of technetium in the atmosphere of a red giant star in 1952, citation by spectroscopy, provided the first evidence of nuclear activity within stars. Source: Internet