Multiyear and multisite photometric campaigns on the bright high-amplitude pulsating subdwarf B star EC 01541-1409

作者：Reed M D^*; Kilkenny D; O' Toole S; Ostensen R H; Honer C; Gilker J T; Quint A C; Doennig A M; Hicks L H; Thompson M A; McCart P A II; Zietsman E; Chen W P; Chen C W; Lin C C; Beck P; Degroote P; Barlow B N; Reichart D E; Nysewander M C; LaCluyze A P; Ivarsen K M; Haislip J B; Baran A; Winiarski M; Drozdz M

来源：Monthly Notices of the Royal Astronomical Society, 2012, 421(1): 181-189.

DOI：10.1111/j.1365-2966.2011.20289.x

• stars: individual: EC 01541-1409
• stars: oscillations
• subdwarfs
• stars: variables: general

We present follow-up observations of the pulsating subdwarf B (sdB) star EC 01541-1409 as part of our efforts to resolve pulsation spectra for use in asteroseismological analyses. This paper reports on data obtained from a single-site campaign, during 2008, and a multisite campaign, during 2009. From limited 2008 data, we were able to clearly resolve and pre-whiten 24 periods. A subsequent multisite campaign spanning nearly 2 months found over 30 individual periodicities most of which were unstable in amplitude and/or phase. Pulsation amplitudes were found to the detection limit, meaning that further observations would likely reveal more periodicities. %26lt;br%26gt;EC 01541-1409 reveals itself to be one of two sdB pulsators with many pulsation frequencies covering a large frequency range. Unlike the other star of this type (PG 0048+091), it has one high-amplitude periodicity which appears phase stable, making EC 01541-1409 an excellent candidate for exoplanet studies via pulsation phases. No multiplets were detected leaving EC 01541-1409 as yet another rich p-mode sdB pulsator without these features, limiting observational constraints on pulsation modes.

• 出版日期2012-3
• 单位中央民族大学