RR Lyrae pulsators as helium indicators in globular clusters

Details RR Lyrae pulsators as helium indicators in globular clusters RR Lyrae pulsators as helium indicators in globular clusters

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82...79c&link_type=abstract

Astronomy and Astrophysics, vol. 82, no. 1-2, Feb. 1980, p. 79-85.

Astronomy and Astrophysics

Astrophysics

15

Galactic Clusters, Globular Clusters, Helium, Pulsars, Variable Stars, Abundance, Chemical Evolution, Stellar Evolution, Stellar Structure

Scientific paper

Synthetic Horizontal Branches have been constructed adopting evolutionary horizontal branch models computed by Caputo, Castellani, and Wood for the case Z = 10-3 and assuming Y = 0.20, 0.25, and 0.30. On this basis the expected evolutionary properties of RR Lyrae pulsators in population II Clusters have been studied. It has been found that some pulsational quantities (Pminab, ¯P and ¯Pab) are strongly correlated with the original helium content Y and that, under fairly wide assumptions, they do not depend on evolutionary parameters such as mass loss and/or mass dispersion. From the above quoted RR Lyrae properties one obtains suggestions for an original He content Y ∼ 0.30 in Oosterhoff type I Globular Clusters. Some theoretical results have been found which disagree with observations. From the latter, it is inferred that in the adopted evolutionary computations lifetimes in the last phases of horizontal branch evolution are likely to be overestimated; this is tentatively confirmed by comparing with the computations of Sweigart and Gross. Pulsational properties are little affected by such an occurrence.

Affiliated with

Also associated with

No associations

Rating

RR Lyrae pulsators as helium indicators in globular clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with RR Lyrae pulsators as helium indicators in globular clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RR Lyrae pulsators as helium indicators in globular clusters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1620110