Hot horizontal-branch stars: the ubiquitous nature of the 'jump' in Stromgren u, low gravities, and the role of radiative levitation of metals - INSPIRE

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Hot horizontal-branch stars: the ubiquitous nature of the 'jump' in Stromgren u, low gravities, and the role of radiative levitation of metals

Mar, 1999

23 pages

Published in:

Astrophys.J. 524 (1999) 242-261

e-Print:

astro-ph/9903120 [astro-ph]

DOI:

10.1086/307807

View in:

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Abstract: (arXiv)

A jump in the BHB distribution in the V, u-y CMD was recently detected in the GC M13. It is morphologically best characterized as a discontinuity in u, u-y, with stars in the range 11,50011,500 K, dramatically enhancing their abundances in the atmospheres of BHB stars in the critical temperature region. Model atmospheres taking diffusion effects into account are badly needed, and will likely lead to better overall agreement between canonical evolutionary theory and observations for BHB stars.

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