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A photometric study of the hydrogen-deficient stars BD+1^ deg4381 (FQ Aqr) and BD-1^ deg3438 (NO Ser)
Photometric monitoring during the period 1993-1997 has been carried outin the UBV system for the cool extreme helium stars BD+1 deg4381 (FQAqr) and BD-1 deg3438 (NO Ser). Periodograms of the data for both starsfor each season of observation show the apparent presence of severalperiods but, if real, none seems to persist for more than one season.Analysis of the full data set for each star reveals no significantperiodicities, although models predict that highly non-adiabaticpulsational variations should occur in hydrogen-deficient stars at thesetemperatures (~ 10 000 K).
| Photometry of hydrogen deficient stars.
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