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We present follow-up observations of pulsating subdwarf B (sdB) stars as partof our efforts to resolve the pulsation spectra for use in asteroseismologicalanalyses. This paper reports on multisite campaigns of the pulsating sdB starsPG 1618+563B and PG 0048+091. Data were obtained from observatories placedaround the globe for coverage from all longitudes. For PG 1618+563B, ourfive-site campaign uncovered a dichotomy of pulsation states: Early during thecampaign the amplitudes and phases (and perhaps frequencies) were quitevariable while data obtained late in the campaign were able to fully resolvefive stable pulsation frequencies. For PG 0048+091, our five-site campaignuncovered a plethora of frequencies with short pulsation lifetimes. We findthem to have observed properties consistent with stochastically excitedoscillations, an unexpected result for subdwarf B stars. We discuss ourfindings and their impact on subdwarf B asteroseismology.

Follow-up observations of pulsating subdwarf B stars: Multisite campaigns on PG 1618+563B and PG 0048+091