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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
EC 10246-2707: An eclipsing subdwarf B + M dwarf binary
Monthly Notices of the Royal Astronomical Society, Volume 430, No. 1, Year 2013
Notification
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Description
We announce the discovery of a new eclipsing hot subdwarf B + M dwarf binary, EC 10246-2707, and present multicolour photometric and spectroscopic observations of this system. Similar to other HW Vir-type binaries, the light curve shows both primary and secondary eclipses, along with a strong reflection effect from the M dwarf; no intrinsic light contribution is detected from the cool companion. The orbital period is 0.118 507 9936 ± 0.000 000 0009 d, or about 3 h. Analysis of our time series spectroscopy reveals a velocity semi-amplitude of K1 = 71.6 ± 1.7 km s-1 for the sdB and best-fitting atmospheric parameters of Teff = 28 900 ± 500 K, log g = 5.64 ± 0.06 and log N(He)/N(H) = -2.5 ± 0.2. Although we cannot claim a unique solution from modelling the light curve, the best-fitting model has an sdB mass of 0.45M⊙ and a cool companion mass of 0.12M⊙. These results are roughly consistent with a canonical-mass sdB andMdwarf separated by a ~ 0.84 R⊙. We find no evidence of pulsations in the light curve and limit the amplitude of rapid photometric oscillations to <0.08 per cent. Using 15 yr of eclipse timings, we construct an observed minus calculated (O - C) diagram but find no statistically significant period changes; we rule out |Ṗ| > 7.2 × 10-12. If EC 10246-2707 evolves into a cataclysmic variable, its period should fall below the famous cataclysmic variable period gap. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Barlow, Brad N.
United States, University Park
Pennsylvania State University
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Kilkenny, David
South Africa, Bellville
University of the Western Cape
Drechsel, Horst
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Dunlap, Bart H.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
O'Donoghue, Darragh E.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Geier, Stephan J.
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
O'Steen, R. G.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Clemens, J. Christopher
United States, Chapel Hill
The University of North Carolina at Chapel Hill
LaCluyzé, Aaron P.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Reichart, Daniel E.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Haislip, Joshua B.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Nysewander, Melissa C.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Ivarsen, Kevin M.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Statistics
Citations: 26
Authors: 13
Affiliations: 6
Identifiers
Doi:
10.1093/mnras/sts271
ISSN:
00358711
e-ISSN:
13652966