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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SDSS J160043.6+074802.9: A very rapid sdO pulsator
Monthly Notices of the Royal Astronomical Society, Volume 371, No. 3, Year 2006
Notification
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Description
We report the serendipitous discovery of the Sloan Digital Sky Survey (SDSS) star SDSS J160043.6+074802.9 to be a very rapid pulsator. The variation is dominated by a frequency near 8380 μHz (period = 119.33 s) with a large amplitude (0.04 mag) and its first harmonic at 16760 μHz (59.66s; 0.005 mag). In between these frequencies, we find at least another eight variations with periods between 62 and 118 s and amplitudes between about 0.007 and 0.003 mag; weaker oscillations might also be present. Preliminary spectrograms from the performance verification phase of the Southern African Large Telescope indicate that SDSS J160043.6+074802.9 is a spectroscopic binary consisting of an sdO star and a late-type mainsequence companion. This makes it the first unambiguous detection of such an sdO star to pulsate, and certainly the first found to exhibit multifrequency variations. © 2006 RAS.
Authors & Co-Authors
Woudt, P. A.
South Africa, Cape Town
University of Cape Town
Kilkenny, D.
South Africa, Cape Town
South African Astronomical Observatory
Zietsman, Ewald
South Africa, Cape Town
University of Cape Town
Warner, Brian P.
South Africa, Cape Town
University of Cape Town
Loaring, Nicola S.
South Africa, Cape Town
South African Astronomical Observatory
Copley, C.
South Africa, Cape Town
University of Cape Town
Kniazev, Alexei Yu
South Africa, Cape Town
South African Astronomical Observatory
Väisänen, Petri S.M.
South Africa, Cape Town
South African Astronomical Observatory
Still, Martin D.
South Africa, Cape Town
South African Astronomical Observatory
Stobie, Robert S.
South Africa, Cape Town
South African Astronomical Observatory
Burgh, Eric B.
United States, Madison
University of Wisconsin-madison
Nordsieck, Kenneth H.
United States, Madison
University of Wisconsin-madison
Percival, Jeffrey W.
United States, Madison
University of Wisconsin-madison
O'Donoghue, Darragh E.
South Africa, Cape Town
South African Astronomical Observatory
Buckley, David A.H.
South Africa, Cape Town
South African Astronomical Observatory
Statistics
Citations: 45
Authors: 15
Affiliations: 3
Identifiers
Doi:
10.1111/j.1365-2966.2006.10788.x
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative