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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PublicaciónThe nature of VX Sagitarii. Is it a TŻO, a RSG, or a high-mass AGB star?
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PublicaciónThe 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...
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PublicaciónThe Near-Infrared Ca II Triplet-σ Relation for Bulges of Spiral Galaxies
We present measurements of the near-infrared Ca II triplet (CaT, CaT*), Paschen (PaT), and magnesium (Mg I) indices for a well-studied sample of 19 bulges of...
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PublicaciónThe Near-infrared Coronal Line Spectrum of 54 nearby Active Galactic Nuclei
The relationship between the emission of coronal lines (CLs) and nuclear activity in 36 Type 1 and 18 Type 2 active galactic nuclei (AGNs) is analyzed, for the...
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PublicaciónThe near-infrared counterpart of 4U 1636-53
Context. The optical counterpart of the neutron star X-ray binary and well known X-ray burster, 4U 1636-53 (=4U 1636-536 = V801 Ara) has been studied for three...
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PublicaciónThe near-infrared-optical-ultraviolet emission of BL Lacertae objects
Near-infrared, optical, and ultraviolet quasi-simultaneous observations of 11 BL Lacertae objects are reported. For all but one source the dereddened spectral...
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PublicaciónThe Near-IR Calcium Triplet: Empirical Calibration and Stellar Populations Models
Not Available
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PublicaciónThe near-IR properties and continuum shapes of high redshift quasars from the Sloan Digital Sky Survey
We present J-H-K' photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of...
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PublicaciónThe Near-Ultraviolet Continuum of Late-Type Stars
Analyses of the near-ultraviolet continuum of late-type stars have led to controversial results regarding the performance of state-of-the-art model atmospheres...