The EC 14026 stars - XIII. EC 05217-3914 and KUV 0442+1416

Details The EC 14026 stars - XIII. EC 05217-3914 and KUV 0442+1416 The EC 14026 stars - XIII. EC 05217-3914 and KUV 0442+1416

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.306..213k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 306, Issue 1, pp. 213-222.

Other

15

Stars: Individual: Ec 05217-3914, Stars: Individual: Kuv 0442+1416, Stars: Oscillations, Stars: Variables: Other

Scientific paper

We report the discovery of short-period oscillations in the sdB stars EC 05217-3914 and KUV 0442+1416, establishing them as members of the EC 14026 stars, a recently discovered class of sdB pulsators. The pulsation periods and atmospheric parameters for both stars are determined. The results are: periods of 218, 216 and 213 s, T_eff = 31 300 +/- 250 K and log g= 5.76 +/- 0.06 for EC 05217-3914 periods of 231, 216 and 184 s, T_eff = 30 900 +/- 400 K and log g= 5.72 +/- 0.1 for KUV 0442+1416. Considerable substructure in the periods is apparent in both stars when several nights of data are combined. KUV 0442+1416 is significantly reddened. The evolutionary status of the 13 well-studied EC 14026 stars is examined. All stars except PG 1605+072 appear to be core He burning. The positions of the pulsators and the apparently constant stars are plotted in the log g-T_eff plane. Apparently constant stars mingle with the pulsators so that there is no well-defined instability strip. This poses a significant challenge to the Fe driving mechanism of Charpinet et al. Five out of the 13 pulsators are obvious binaries.

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