Green, E. M., Fontaine, G., Drechsel, H., Shaw, J. S., Dittmann, J. A., ...
We present new photometric and spectroscopic observations for 2M 1533+3759 (= NSVS 07826147). It has an orbital period of 0.16177042 day, significantly longer than the 2.3--3.0 hour periods of the...
KBS 13 -- a Rare Reflection Effect sdB Binary with an M Dwarf Secondary (2008)
Edelmann, H., Green, E. M., Drechsel, H., Nesslinger, S., Fontaine, G.
We report preliminary VRI differential photometric and spectroscopic results for KBS 13, a recently discovered non-eclipsing sdB+dM system. Radial velocity measurements indicate an orbital period of...
Binary White Dwarfs in the Supernova Ia Progenitor Survey. (2007)
Napiwotzki, R., Karl, C., Nelemans, G., Yungelson, L., Christlieb, N., Drechsel, H., ...
O'Toole, S. J., Napiwotzki, R., Heber, U., Drechsel, H., Frandsen, S., Grundahl, F., ...
The variable sdB known as V46 in the globular cluster M4 has remained enigmatic since its discovery almost 10 years ago. We present here radial velocity measurements obtained from medium-resolution...
On the most metal-poor PN and its binary central star (2005)
Napiwotzki, R., Tovmassian, G., Richer, M. G., Stasinska, G., Pena, M., Drechsel, H., ...
PN G135.9+55.9 is the most metal-poor PN known in our Galaxy. The central star resides in a short-period binary system with a compact component, probably a white dwarf. We describe new observations,...
The Mass of the sdB Primary of the Binary HS 2333+3927. (2005)
Heber, U., Drechsel, H., Karl, C., Ostensen, R., Folkes, S.L., Napiwotzki, R., ...
New Results from the Supernova Ia Progenitor Survey. (2005)
Napiwotzki, R., Karl, C., Nelemans, G., Yungelson, L., Christlieb, N., Drechsel, H., ...
HS 2333 3927: A new sdB dM binary with a large reflection effect (2004)
Heber, U., Drechsel, H., Ostensen, R., Karl, C., Napiwotzki, R., Altmann, M., ...
Double degenerates and progenitors of supernovae type Ia (2004)
Napiwotzki, R., Yungelson, L., Nelemans, G., Marsh, T. R., Leibundgut, B., Renzini, A., ...
We report on systematic radial velocity surveys for white dwarf - white dwarf binaries (double degenerates - DDs) including SPY (ESO Supernovae Ia progenitor survey) recently carried out at the VLT....
Close binary white dwarfs and supernovae IA (2004)
Christlieb , N., Drechsel , H., Heber , U., Homeier , D., Karl , C., Koester , D., ...
Informamos sobre el estado actual de los surveys" de velocidades radiales para binarias de enanas blancas (degeneradas dobles - DDs) incluyendo SPY (Exploración ESO de progenitoras de supernovas Ia)...
Double Degenerate and Progenitors of Supernovae Type Ia. (2004)
Napiwotzki, R., Yungelson, L., Nelemans, G., Marsh, T.R., Leibundgut, B., Renzini, A., ...
HS 2333 + 3927: a new sdB binary with a large reflection effect. (2004)
Karl, C., Heber, U., Drechsel, H., Napiwotzki, R., Altmann, M., Ostensen, R., ...
“The original publication is available at www.springerlink.com”. Copyright Springer. DOI: 10.1023/B:ASTR.0000044334.98860.ab [Full text of this article is not available in the UHRA]
2MASS J0516288+260738: Discovery of the first eclipsing late K + Brown dwarf binary system (2003)
Schuh, S.L., Handler, G., Drechsel, H., Hauschildt, P., Dreizler, S., Medupe, R., ...
2MASSJ0516288+260738: Discovery of the first eclipsing late K + Brown dwarf system? (2003)
Schuh, S. L., Handler, G., Drechsel, H., Hauschildt, P. H., Dreizler, S., Medupe, R., ...
We report the discovery of a new eclipsing system less than one arcminute south of the pulsating DB white dwarf KUV 05134+2605. The object could be identified with the point source...
Search for double degenerate progenitors of supernovae type Ia with SPY (2002)
Napiwotzki, R., Christlieb, N., Drechsel, H., Heber, U., Homeier, D., ...
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 - SPY). About 560...
Search for double degenerate progenitors of supernovae type Ia with SPY (2002)
Napiwotzki, R., Drechsel, H., Heber, U., Karl, C., Christlieb, N., ...
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 surveY - SPY).
Napiwotzki, R., Koester, D., Nelemans, G., Yungelson, L., Christlieb, N., Renzini, A., ...
In the course of our search for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY) we...
Search for progenitors of supnernovae type Ia with SPY (2002)
Napiwotzki, R., Christlieb, N., Drechsel, H., Heber, U., Homeier, D., ...
We have started 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 surveY - SPY). About...
Tomographic Separation of Composite Spectra. X. The Massive Close Binary HD 101131 (2002)
Gies, D. R., Penny, L. R., Mayer, P., Drechsel, H., Lorenz, R.
We present the first orbital elements for the massive close binary, HD 101131, one of the brightest objects in the young, open cluster, IC 2944. This system is a double-lined spectroscopic binary in...
HS 0705 6700: A new eclipsing sdB binary (2001)
Drechsel, H., Heber, U., Napiwotzki, R., Ostensen, R., Solheim, J.E., Johannessen, F., ...
HS 0705+6700: a new eclipsing sdB binary (2001)
Drechsel, H., Heber, U., Napiwotzki, R., Ostensen, R., Johannessen, F., ...
We report the discovery of an eclipsing binary - HS 0705+6700 - being an sdB star with a faint companion. From its light curve the orbital period of 8263.87 s, the mass ratio of the system q = 0.28,...
Binaries discovered by the SPY project. I. HE 1047-0436: A subdwarf B white dwarf syste (2001)
Napiwotzki, R., Edelmann, H., Heber, U., Karl, C., Drechsel, H., Pauli, E.M., ...
Binaries discovered by the SPY project I. HE 1047-0436: a subdwarf B + white dwarf system (2001)
Napiwotzki, R., Edelmann, H., Heber, U., Karl, C., Drechsel, H., ...
In the course of our search for double degenerate binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY) we discovered...
Search for progenitors of supernovae type Ia with SPY (2001)
Napiwotzki, R., Christlieb, N., Drechsel, H., Heber, U., Homeier, D., ...
Search for progenitors of supernovae type Ia with SPY. (2001)
Napiwotzki, R., Christlieb, N., Drechsel, H., Hagen, H.J., Heber, U., Homeier, D., ...
‘The definitive version is available at www3.interscience.wiley.com .' Copyright WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim DOI: 10.1002/1521-3994(200112)322:5/63.0.CO;2-I [Full text of this...
Drechsel, H, Thieken, A, Reissbrodt, R, Jung, G, Winkelmann, G
Growth promotion and iron transport studies revealed that certain alpha-keto acids generated by amino acid deaminases, by enterobacteria of the Proteus-Providencia-Morganella group (of the tribe...
Drechsel, H, Thieken, A, Reissbrodt, R, Jung, G, Winkelmann, G
Growth promotion and iron transport studies revealed that certain alpha-keto acids generated by amino acid deaminases, by enterobacteria of the Proteus-Providencia-Morganella group (of the tribe...