Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids

Details Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids

2003-04-02

arxiv.org/abs/astro-ph/0304053v1

Astronomy and Astrophysics

Astrophysics

13 pages with 6 figures, accepted for publication in Acta Astronomica

Scientific paper

We compared period changes derived from O-C diagrams for 63 classical Cepheids from our Galaxy with model calculations. We found that for Cepheids with log P > 1.0 the observed changes are smaller than predicted values, except variable SZ Cas. However some of the first overtone Cepheids, particularly EU Tau and Polaris, change its period much faster than it follows from theory. Summary of the known data on the period changes in Cepheids from the Galaxy and from the Magellanic Clouds (previous papers) leads to conclusion that none of the 999 Cepheid is undergoing the first crossing of the instability strip. Also the observed period changes for long-period Cepheids are a few times slower than predicted by the models. These results imply that much larger fraction of helium is burnt in the Cepheid stage than it is predicted by models.

Affiliated with

Also associated with

No associations

Rating

Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids 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 Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-124830