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Finding Compact Hot Subdwarf Binaries in the Galactic Disc

Kupfer, T. and Geier, S. and McLeod, A. Faye and Groot, P. J. and Verbeek, K. and Schaffenroth, V. and Heber, U. and Heuser, C. and Ziegerer, E. and Østensen, R. and Nemeth, P. and Dhillon, V. S. and Butterley, T. and Littlefair, S. P. and Wilson, R. W. and Telting, J. H. and Shporer, A. and Fulton, B. J. (2014) Finding Compact Hot Subdwarf Binaries in the Galactic Disc. In: 6th Conference on Hot Subdwarf Stars and Related Objects. Astronomical Society of the Pacific Conference Series. No.481. Astronomical Society of the Pacific , San Francisco, CA, pp. 293-300. ISBN 978-1-58381-846-6.

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We started a new project which aims to find compact hot subdwarf binaries at low Galactic latitudes. Targets are selected from several photometric surveys and a spectroscopic follow-up campaign to find radial velocity variations on timescales as short as tens of minutes has been started. Once radial variations are detected phase-resolved spectroscopy is obtained to measure the radial velocity curve and the mass function of the system. The observing strategy is described and the discovery of two short period hot subdwarf binaries is presented. UVEX J032855.25+503529.8 contains a hot subdwarf B star (sdB) orbited by a cool M-dwarf in a P=0.11017 days orbit. The lightcurve shows a strong reflection effect but no eclipses are visible. HS 1741+2133 is a short period (P=0.20 days) sdB most likely with a white dwarf (WD) companion.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Kupfer, T.0000-0002-6540-1484
Geier, S.0000-0002-3948-9339
Groot, P. J.0000-0002-4488-726X
Heber, U.0000-0001-7798-6769
Littlefair, S. P.0000-0001-7221-855X
Shporer, A.0000-0002-1836-3120
Fulton, B. J.0000-0003-3504-5316
Additional Information:© 2014 Astronomical Society of the Pacific. T. K. acknowledges the support by the Netherlands Research School for Astronomy (NOVA). V. S. was supported by Deutsches Zentrum für Luftund Raumfahrt DLR under grant 50 OR 1110. C. H. and E. Z. were supported by Deutsche Forschungsgemeinschaft under grant He1356/62-1 and He1356/45-2, respectively. Some results presented in this paper are based on observations made with the William Herschel Telescope and the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Institutio de Astrofisica de Canarias. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.
Funding AgencyGrant Number
Nederlandse Onderzoekschool Voor Astronomie (NOVA)UNSPECIFIED
Deutsches Zentrum für Luftund Raumfahrt (DLR)50 OR 1110
Deutsche Forschungsgemeinschaft (DFG)He1356/62-1
Deutsche Forschungsgemeinschaft (DFG)He1356/45-2
Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:481
Record Number:CaltechAUTHORS:20180823-144645753
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89114
Deposited By: Tony Diaz
Deposited On:23 Aug 2018 22:06
Last Modified:09 Mar 2020 13:19

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