Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214l.127c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 214, June 15, 1977, p. L127-L131. ERDA-sponsored research
Astronomy and Astrophysics
Astrophysics
39
Astrophysics, Cepheid Variables, Light Curve, Stellar Mass, Velocity Distribution, Helium, Line Shape, Stellar Envelopes, Stellar Luminosity, Stellar Models
Scientific paper
Attempts are made to remove the discrepancy between the masses predicted by evolutionary theory and by pulsation theory for double-mode and bump Cepheids. To this end, convection, differential rotation, and the presence of inhomogeneous envelopes are considered as mechanisms for reducing the ratios between first-overtone and fundamental period and second-overtone and fundamental period for the double-mode Cepheids U TrA and V367 Sct as well as for the bump Cepheids U Sgr and Beta Dor. Analysis of various models for each star shows that inhomogeneous helium-enriched envelopes can increase the masses of both types of Cepheids based on linear nonadiabatic period ratios and bring them much closer to the evolutionary masses. It is noted that such helium-enriched inhomogeneous mixed outer regions can be maintained only if rotation is so slow that no meridional circulation can destroy the enrichment faster than it is established.
Cox Arthur N.
Deupree Robert G.
Hodson Stephen W.
King David S.
No associations
LandOfFree
Revised masses for the double-mode and bump 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 Revised masses for the double-mode and bump Cepheids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revised masses for the double-mode and bump Cepheids will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1593936