Bibcode
DOI
Bencivenni, D.; Caputo, F.; Manteiga, M.; Quarta, M. L.
Bibliographical reference
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 20, 1991, p. 484-494. Research supported by CNPq and CNR.
Advertised on:
10
1991
Journal
Citations
35
Refereed citations
33
Description
This paper discusses synthetic horizontal branches constructed from a
grid of horizontal-branch (HB) evolutionary tracks with the
alpha-elements enhanced by a factor of 5 with respect to the
solar-scaled mixture and various surface helium and heavy-element
abundances. The luminosity log L(3.83) and the luminosity-to-mass ratio
A(3.83) of the ZAHB at the RR Lyrae gap are found to depend, for fixed
helium abundance, on the total metallicity, irrespective of the adopted
ratio of alpha to heavy elements. The increase over log L(3.83) and
A(3.83), as the result of post-ZAHB evolution, appears rather small for
the HB type in the range of -0.7 to 0.7, whereas it becomes quite
significant for bluer HB morphologies.