The radii and masses of dwarf Cepheids

Details The radii and masses of dwarf Cepheids The radii and masses of dwarf Cepheids

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..451f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 15, 1987, p. 451-468.

Astronomy and Astrophysics

Astronomy

29

Cepheid Variables, Dwarf Stars, Stellar Mass, Astronomical Photometry, Light Curve, Radial Velocity, Stellar Magnitude, Stellar Models

Scientific paper

A radial velocity curve for CY Aqr, and VJK photometry for CY Aqr, YZ Boo, and VZ Cnc, are used to derive absolute magnitudes and masses for these three dwarf Cepheids. If dwarf Cepheids are early post-main-sequence stars, a pulsation mass of 1.2 + or - 0.3 solar masses is found, and the pulsation mass to evolutionary mass ratio is about 0.75. A mean value of -8.6 x 10 to the -11th days/day for the period changes is derived which is an order of magnitude larger than predicted by early post-main-sequence evolutionary tracks. Problems in modeling these stars at a more advanced evolutionary state are noted. Comparison is made between the properties of fundamental and possible overtone pulsators. The possible relationship between Delta Scuti behavior and the small cycle-to-cycle variations found in dwarf Cepheid light curves is also considered.

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