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Stellar wind signatures in sdB stars?
U. Heber, P. F. L. Maxted, T. R. Marsh +2
Subdwarf B (sdB) stars form the blue end of the horizonal branch. Their peculiar atmospheric abundance patterns are due to diffusion processes. However, diffusion models fail to ex…
Stellar wind signatures in sdB stars?
U. Heber, P. F. L. Maxted, T. R. Marsh +2
Subdwarf B (sdB) stars form the blue end of the horizonal branch (EHB). Their peculiar atmospheric abundance patterns are due to diffusion processes. However, diffusion models fail…
Search for double degenerate progenitors of supernovae type Ia with SPY
R. Napiwotzki, N. Christlieb, H. Drechsel +13
We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (SN Ia Progenitor surveY -…
Discovery of 15-second oscillations in Hubble Space Telescope observations of WZ Sagittae following the 2001 outburst
C. Knigge, R. I. Hynes, D. Steeghs +3
We report the discovery of 15-s oscillations in ultraviolet observations of WZ Sge obtained with the Hubble Space Telescope approximately one month after the peak of the 2001 outbu…
Search for double degenerate progenitors of supernovae type Ia with SPY
R. Napiwotzki, H. Drechsel, U. Heber +13
We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surve…
New subdwarf B star periods
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +1
Subdwarf B (sdB) stars are thought to be helium burning stars with low mass hydrogen envelopes. Several evolutionary paths have been proposed to explain the formation of these syst…
The Origin of Subdwarf B Star (I): the Formation Channels
Zhanwen Han, Philipp Podsiadlowski, Pierre L. F. Maxted +2
Subdwarf B (sdB) stars (and related sdO/sdOB stars) are believed to be helium core-burning objects with very thin hydrogen-rich envelopes. In recent years it has become increasingl…
PG1115+166 - a long period DA+DB binary
P. F. L. Maxted, M. R. Burleigh, T. R. Marsh +1
We present spectra of the DAB white dwarf PG1115+166. Radial velocity measurements of the Balmer lines and the HeI6678 line show that this is a binary white dwarf with a period of…
Photometry of four binary subdwarf B stars and the nature of their unseen companion stars
P. F. L. Maxted, T. R. Marsh, U. Heber +3
We present lightcurves of four binary subdwarf B stars, Ton 245, Feige 11, PG1432+159 and PG1017-086. We also present new spectroscopic data for PG1017-086 from which we derive its…
The mass ratio distribution of short period double degenerate stars
P. F. L. Maxted, T. R. Marsh, C. K. J. Moran
Short period double degenerates (DDs) are close white dwarf - white dwarf binary stars which are the result of the evolution of interacting binary stars. We present the first defin…
Searching for spiral shocks
L. Morales-Rueda, T. R. Marsh
Spiral shocks in cataclysmic variables (CVs) are the result of tidal interactions of the mass donor star with the accretion disc. Their study is fundamental for our understanding o…