Pulsation constants and period ratios are given for the
first six radial pulsation modes of a set of seven polytropes
with indices ranging from n = 2.25 to n = 4.00. The polytrope
results are combined with published theoretical data from stellar
model pulsation calculations and observational data on thirteen
double mode variables in the Cepheid instability strip to obtain
four interpolation formulae relating fundamental periods Po,
pulsation constants Qo, and period ratios P1 /P0 and P2 /P1. The
derived relations are used to obtain accurate densities for the
thirteen observed variables, which include six dwarf Cepheids or AI
Vel stars, one S Sct star, one RR Lyr star, and five Cepheids.
Approximate masses and luminosities are obtained for some of these
stars. The probable connection between mass- luminosity ratios and
the existence of double mode variables is discussed.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/623882 |
| Date | January 1970 |
| Creators | Fitch, W. S. |
| Contributors | Univ Arizona, Steward Observ |
| Publisher | Steward Observatory, The University of Arizona (Tucson, Arizona) |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Article |
| Source | Steward Observatory Parker Library SO QB 4 .S752 ARCH |
| Rights | Copyright © All Rights Reserved. |
| Relation | Preprints of the Steward Observatory #26b, http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1970ApJ...161..669F&db_key=AST&data_type=HTML&format=&high=3ed65e9cd017932 |
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