Aims: We seek to detect and quantify the effects of surface convection (granulation) on the line spectra of K-dwarfs as a first step towards a rigorous testing of hydrodynamic models for their atmospheres. Methods: Very high-resolution (R≃160 000-210 000), high signal-to-noise ratio (S/N⪆300) spectra of nine bright K-dwarfs were obtained with the
This section contains the publications database that collects IAC articles published in scientific journals. Please, click on the arrow to see full search filter and sort options: author, journal, year, etc..
It also provides access to IAC Preprints Repository here: https://research.iac.es/preprints/
-
Granulation in K-type dwarf stars. I. Spectroscopic observationsRamírez, I. et al.122008
-
Granulation Signatures in the Spectrum of the Very Metal-poor Red Giant HD 122563
A very high resolution (R = λ/Δλ = 200, 000), high signal-to-noise ratio (S/N ~= 340) blue-green spectrum of the very metal-poor ([Fe/H] ~= -2.6) red giant star HD 122563 has been obtained by us at McDonald Observatory. We measure the asymmetries and core wavelengths of a set of unblended Fe I lines covering a wide range of line strength. Line
Ramírez, I. et al.Advertised on:
122010 -
Gravitational Lens Candidates in the HST Survey of BL Lac Objects
Not Available
Treves, A. et al.Advertised on:
121999 -
Gravitational Lens Models Based on Submillimeter Array Imaging of Herschel-selected Strongly Lensed Sub-millimeter Galaxies at z > 1.5
Strong gravitational lenses are now being routinely discovered in wide-field surveys at (sub-)millimeter wavelengths. We present Submillimeter Array (SMA) high-spatial resolution imaging and Gemini-South and Multiple Mirror Telescope optical spectroscopy of strong lens candidates discovered in the two widest extragalactic surveys conducted by the
Bussmann, R. S. et al.Advertised on:
122013 -
GravityCam: ground-based wide-field high-resolution imaging and high-speed photometry
The image blurring by the Earth's atmosphere generally poses a substantial limitation to ground-based observations. While opportunities in space are scarce, lucky imaging can correct over a much larger patch of sky and with much fainter reference stars. We propose the first of a new kind of versatile instruments, "GravityCam", composed of ~100
Dominik, Martin et al.Advertised on:
122015 -
GRB 011121: A Collimated Outflow into Wind-blown Surroundings
We report optical and near-infrared follow-up observations of GRB 011121 collected predominantly at ESO telescopes in Chile. We discover a break in the afterglow light curve after 1.3 days, which implies an initial jet opening angle of about 9°. The jet origin of this break is supported by the fact that the spectral energy distribution is
Greiner, J. et al.Advertised on:
122003