期刊
ASTROPHYSICAL JOURNAL
卷 845, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa8263
关键词
stars: oscillations (including pulsations)
资金
- Association of Universities for Research in Astronomy, Inc., under NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1517030] Funding Source: National Science Foundation
NASA's Galaxy Evolution Explorer (GALEX) provided near-and far-UV observations for approximately 77% of the sky over a 10-year period; however, the data reduction pipeline initially only released single NUV and FUV images to the community. The recently released Python module gPhoton changes this, allowing calibrated time-series aperture photometry to be extracted easily from the raw GALEX data set. Here we use gPhoton to generate light curves for all hot subdwarf B (sdB) stars that were observed by GALEX, with the intention of identifying short-period, p-mode pulsations. We find that the spacecraft's short visit durations, uneven gaps between visits, and dither pattern make the detection of hot subdwarf pulsations difficult. Nonetheless, we detect UV variations in four previously known pulsating targets and report their UV pulsation amplitudes and frequencies. Additionally, we find that several other sdB targets not previously known to vary show promising signals in their periodograms. Using optical follow-up photometry with the Skynet Robotic Telescope Network, we confirm p-mode pulsations in one of these targets, LAMOST J082517.99+113106.3, and report it as the most recent addition to the sdBVr class of variable stars.
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