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Chapter
Classical Novae
Classical nova explosions are the third most violent explosions that can occur in a galaxy, exceeded only by a supernova explosion and a γ-ray burst. With total liberated energies of more than 10{su45} erg s{s...
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Chapter and Conference Paper
Optical Identification of X-ray Sources in a High X-ray Flux Sensitivity area from the Rass
We have optically identified a complete sub-sample of ROSAT All-Sky Survey (RASS) X-ray sources contained in 6 study areas. Of the original 12°12° area near the NEP only one quarter was observed until now in o...
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Chapter and Conference Paper
Identification of a Complete Sample of Northern Rosat All-Sky Survey X-Ray Sources
We present results of the optical identification of a spatially complete, flux limited sample of about 700 ROSAT All-Sky X-ray sources contained in 6 study areas north of δ = -9° with |b II ...
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Chapter and Conference Paper
The ORFEUS far ultraviolet spectrum of the LMC binary star HDE 269546
Far UV high resolution spectra of 3 LMC and SMC stars were obtained with the Echelle spectrograph during the second ORFEUS mission in Dec. 1996. We present the first results from observations of the LMC star HDE ...
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Chapter and Conference Paper
D/H-ratio: Observations with ORFEUS II
During the second flight of the ORFEUS-SPAS satellite (Nov./Dec. 96) high resolution (λ/Δλ = 10,000) Echelle-spectra of BD + 28° 4211 in the wavelength regime 912 – 1400 Å have been taken. Deuterium can be clearl...
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Article
Rosat observations of pleiades flare stars
The X-ray data of a sample of 104 flare stars (FSs) in the Pleiades cluster region obtained by Stauffer et al. [1] on the basis of deep ROSAT PSPC observations are analyzed. If we divide the X-ray emission det...
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Chapter and Conference Paper
ORFEUS Observation of the Central Star of NGC 6543
During the ORFEUS-SPAS (Orbiting Retrievable Far and Extreme Ultraviolet Spectrometer on the Shuttle Pallet Satellite) mission STS-51, flown in September 1993, we observed the central star of the planetary neb...
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Chapter and Conference Paper
The New Ultrashort-Period Cataclysmic Variable RX J0757.0+6306
A new cataclysmic variable is identified as the optical counterpart of the X-ray source RX J0757.0+6306. The emission lines bear evidence of a strong disc with an S-wave with period of 75±1.4 min, which we ide...
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Chapter and Conference Paper
The X-ray and EUV Turnoff of GQ Mus and V1974 Cyg
Both GQ Mus and V1974 Cyg were observed to turnoff in X-rays by ROSAT. The turnoff of V1974 Cyg was also observed with EUVE. GQ Mus was observed near the beginning of its outburst with EXOSAT and then 7 years lat...
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Chapter and Conference Paper
ROSAT survey sources in star formation regions
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Chapter and Conference Paper
Emission line stars in LMC dark clouds
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Article
Buchbesprechungen
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Chapter and Conference Paper
Far and Extreme Ultraviolet Astronomy with ORFEUS
ORFEUS (Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer) is a 1 m normal incidence telescope for spectroscopic investigations of cosmic sources in the far and extreme ultraviolet spectral ran...
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Article
Exosat observations of X-rays from classical novae during outburst stage
The initial discovery of soft X-rays from Nova Muscae 1983 was followed by eight additional observations of the three brightest novae whose outburst stage coincided with the lifetime ofEXOSAT satellite; namely th...
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Chapter and Conference Paper
Exosat Observations of X-Rays from Classical Novae During Outburst Stage
The initial discovery of soft X-rays from Nova Muscae 1983 was followed by eight additional observations of the three brightest novae whose outburst stage coincided with the lifetime of EXOSAT satellite; namely t...
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Article
X-ray and optical observations of Nova Muscae 1983 during its nebular stage
The detection of X-rays from Nova Muscae 1983 (discovered on January 18, 1983) constitutes the first detection of X-rays from a classical nova during outburst. X-ray observations were carried out on 1984 April...
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Article
EXOSAT and optical observations of the X-ray burst source 4U/MXB1636-53
During May 1984 we made a one-day EXOSAT observation of the X-ray burst source 4U/MXB1636-53, partly simultaneous with Tenma and with optical observations at ESO. In this paper we give a short description of t...
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Chapter and Conference Paper
X-Ray and Optical Observations of Nova Muscae 1983 during its Nebular Stage
The detection of X-rays from Nova Muscae 1983 (discovered on January 18, 1983) constitutes the first detection of X-rays from a classical nova during outburst. X-ray observations were carried out on 1984 April...
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Chapter and Conference Paper
Exosat and Optical Observations of the X-Ray Burst Source 4U/MXB1636-53
During May 1984 we made a one-day EXOSAT observation of the X-ray burst source 4U/MXB1636-53, partly simultaneous with Tenma and with optical observations at ESO. In this paper we give a short description of t...
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Chapter and Conference Paper
UV Spectroscopy of the Novalike Variable TT Arietis
TT Ari was detected by Strohmeier et al. (1957) and is classified as a novalike variable. It was hitherto unclear whether TT Ari is a special type of dwarf nova (Warner, 1976) or an old nova (Cowley et al., 19...
