SIMBAD references

1999MNRAS.306..213K - Mon. Not. R. Astron. Soc., 306, 213-222 (1999/June-2)

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


Abstract (from CDS):

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, Teff = 31 300±250 K and log g= 5.76 ± 0.06 for EC 05217-3914; periods of 231, 216 and 184 s, Teff = 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-Teff 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.

Abstract Copyright: 1999 RAS

Journal keyword(s): stars: individual: EC 05217-3914 - stars: individual: KUV 0442+1416 (read: KUV 04421+1416) - stars: oscillations - stars: variables: other

Simbad objects: 13

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