We report new (1995) Very Large Array (VLA) observations and (1984-1999) Effelsberg 100 m monitoring observations of the 22 GHz H2O maser spectrum of the...
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PublicationThe Nature of the Nuclear H2O Masers of NGC 1068: Reverberation and Evidence for a Rotating Disk Geometry
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PublicationThe Nature of the UV/Optical Emission of the Ultraluminous X-Ray Source in Holmberg II
We report on UV and X-ray spectroscopy and broadband optical observations of the ultraluminous X-ray source in Holmberg II. Fitting various stellar spectral...
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PublicationThe nature of the X-ray sources in dwarf galaxies in nearby clusters from the KIWICS
We present a deep search for and analysis of X-ray sources in a sample of dwarf galaxies (M r < -15.5 mag) located within twelve galaxy clusters from the...
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PublicationThe nature of the X-ray transient MAXI J0556-332
Phase-resolved spectroscopy of the newly discovered X-ray transient MAXI J0556-332 has revealed the presence of narrow emission lines in the Bowen region that...
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PublicationThe nature of the X-ray transient SAX J1711.6-3808
SAX J1711.6-3808 is an X-ray transient in the Galactic bulge that was active from January through May of 2001 and whose maximum 1-200 keV luminosity was...
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PublicationThe Nature of Ultraluminous X-Ray Sources
We present spectroscopic observations of six optical counterparts of ultraluminous X-ray sources (ULXs) around nearby galaxies. The spectra of the six objects...
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PublicationThe nature of V39: an LBV candidate or LBV impostor in the very low metallicity galaxy IC 1613?
Context. Very few examples of luminous blue variable (LBV) stars or LBV candidates (LBVc) are known, particularly at metallicities below that of the Small...
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PublicationThe nature of VX Sagitarii. Is it a TŻO, a RSG, or a high-mass AGB star?
Aims: We present a spectroscopic analysis of the extremely luminous red star VX Sgr based on high-resolution observations combined with AAVSO light curve data...
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PublicationThe near-infrared Ca II triplet as a metallicity indicator - II. Extension to extremely metal-poor metallicity regimes
We extend our previous calibration of the infrared Ca II triplet (CaT) as a metallicity indicator to the metal-poor regime by including observations of 55 field...