AAS 201st Meeting, January, 2003
Session 117. Delta Scuti and Pulsating Friends
Poster, Thursday, January 9, 2003, 9:20am-4:00pm, Exhibit Hall AB

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[117.08] DY Herculis and the Dwarf Cepheid P-L Relation

M.D. Joner (BYU), C.D. Laney (SAAO)

We present new VJK photometry and echelle radial velocity measurements for the High-Amplitude Delta Scuti star (HADS, dwarf Cepheid) DY Herculis. These data are used to determine a BW radius for the star. This technique is successful and when the results are combined with results for other stars in our sample, the PR and PL relations appear to be extensions of the relations for classical Cepheids. This supports the 'long' distance scale hypothesis.

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