Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..179a&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 179-182 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Stars, Stellar Evolution, Stellar Luminosity, Stellar Models, Iue, Ultraviolet Astronomy
Scientific paper
Recent theoretical attempts to understand the later evolution of population II stars have met with some success in accounting for the positions of UV-bright stars in globular cluster color magnitude diagrams. In particular, model calculations have been published which suggest the existence of two distinct sub-classes of UV-bright star, based on their luminosity above the horizontal branch (HB). IUE observations of individual UV-bright stars in several globular clusters do indeed show a separation into two luminosity groups, with more than half of the stars belonging to the high luminosity class. Whereas spectra of resolved hot sources found in the cores of seven clusters lead us to believe that they are also UV-bright stars, unlike the stars outside the core they fall mostly in the low luminosity group.
Altner Bruce M.
Holton B.
Matilsky Terry A.
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