Hot Horizontal‐Branch Stars: The Ubiquitous Nature of the “Jump” in Stromgrenu, Low Gravities, and the Role of Radiative Levitation of Metals | Zendy

F. Grundahl | Zendy; M. Catelan | Zendy; V. La Parola | Zendy; P. B. Stetson | Zendy; M. I. Andersen | Zendy

Open Access

Hot Horizontal‐Branch Stars: The Ubiquitous Nature of the “Jump” in Stromgrenu, Low Gravities, and the Role of Radiative Levitation of Metals

Author(s) -

F. Grundahl,

M. Catelan,

V. La Parola,

P. B. Stetson,

M. I. Andersen

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/307807

Subject(s) - physics , astrophysics , metallicity , red giant branch , horizontal branch , stars , globular cluster , photometry (optics) , radiative transfer , galaxy , redshift , quantum mechanics

A "jump" in the BHB distribution in the V, u-y CMD was recently detected inthe 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 intoaccount are badly needed, and will likely lead to better overall agreementbetween canonical evolutionary theory and observations for BHB stars.Comment: ApJ, Main Journal, accepted. Contains several changes and update

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