We discuss the effects of microlensing on the broad emission lines (BELs) of QSOs in the light of recent determinations of the size of the broad-line region (BLR) and its scaling with QSO luminosity. Microlensing by star-sized objects can produce significant amplifications in the BEL of some multiple-imaged QSOs, and could be very relevant for high
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Además ofrece acceso al repositorio de preprints del IAC: https://research.iac.es/preprints/l
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The Influence of Gravitational Microlensing on the Broad Emission Lines of QuasarsAbajas, C. et al.92002
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The Infrared Ca II Triplet as Metallicity Indicator
From observations of almost 500 red giant branch stars in 29 Galactic open and globular clusters, we have investigated the behavior of the infrared Ca II triplet (8498, 8542, and 8662 Å) in the age range 13 Gyr
Carrera, R. et al.Fecha de publicación:
92007 -
The Infrared Nuclear Emission of Seyfert Galaxies on Parsec Scales: Testing the Clumpy Torus Models
We present subarcsecond resolution mid-infrared (mid-IR) photometry in the wavelength range from 8 to 20 μm of 18 Seyfert galaxies, reporting high spatial resolution nuclear fluxes for the entire sample. We construct spectral energy distributions (SEDs) that the active galactic nucleus (AGN) dominates, relatively uncontaminated by starlight, adding
Ramos Almeida, C. et al.Fecha de publicación:
92009 -
The inhomogeneous circumstellar envelope of Rigel (beta Orionis A)
We report on time series Hα profiles of the late B-type supergiant Rigel (beta Orionis A). Our observations indicate the presence of variable and asymmetric outflows and infalls of matter. We have recorded a blueshifted high-velocity absorption component in Hα almost simultaneously with Kaufer et al. The final part of this extraordinary event has
Israelian, G. et al.Fecha de publicación:
91997 -
The Inhomogeneous Surface of Centaur 32522 Thereus (2001 PT13)
Eight low-resolution near-infrared spectra (0.8-2.4 μm) of 32522 Thereus were obtained on 2002 August 28 from 0:30 to 5:30 UT, covering more than half of its rotation period, with the 3.56 m Telescopio Nazionale Galileo (TNG) at El Roque de los Muchachos Observatory (ORM, Canary Islands, Spain). All the spectra are red, probably due to a mantle of
Licandro, J. et al.Fecha de publicación:
92005 -
The Initial--Final Mass Relationship of White Dwarfs in Common Proper Motion Pairs
A promising approach to decrease the uncertainties in the initial--final mass relationship, which is still poorly constrained, is to study white dwarfs for which external constraints are available, for instance, white dwarfs in common proper motion pairs (CPMPs). Important information of the white dwarf can be inferred from the study of the
Catalán, S. et al.Fecha de publicación:
92007