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

M. D. Reed, S. J. O'Toole, D. M. Terndrup, J. R. Eggen, A. Y. Zhou, D. An, C. W. Chen, W. P. Chen, H. C. Lin, C. Akan, O. Cakirli, H. Worters, D. Kilkenny, M. Siwak, S. Zola, Seung Lee Kim, G. A. Gelven, S. L. Harms, G. W. Wolf

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We present follow-up observations of pulsating subdwarf B (sdB) stars as part of our efforts to resolve the pulsation spectra for use in asteroseismological analyses. This paper reports on multisite campaigns of the pulsating sdB stars PG1618+563B and PG 0048+091. Data were obtained from observatories placed around the globe for coverage from all longitudes. For PG 1618+563B, our five-site campaign uncovered a dichotomy of pulsation states. Early during the campaign the amplitudes and phases (and perhaps frequencies) were quite variable, while data obtained late in the campaign were able to fully resolve five stable pulsation frequencies. For PG 0048+091, our five-site campaign uncovered a plethora of frequencies with short pulsation lifetimes. We find them to have observed properties consistent with stochastically excited oscillations, an unexpected result for subdwarf B stars. We discuss our findings and their impact on subdwarf B asteroseismology.

Original languageEnglish
Pages (from-to)518-535
Number of pages18
JournalAstrophysical Journal
Volume664
Issue number1 I
DOIs
StatePublished - 20 Jul 2007

Keywords

  • Binaries: close
  • Stars: general

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