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/
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Monitoring of active galacitc nuclei. 4: The Seyfert 1 galaxy NGC 4593Results of a five-month campaign of optical monitoring the Seyfert 1 galaxy NGC 4593 are presented. High resolution H-alpha and H-Beta spectra and direct images in the Johnson U, B, V, R, and I bands were obtained between January and June 1990. The emission lines and the continuum showed strong variations on time scales of weeks to days. The HDietrich, M. et al.
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41994 -
Lightcurves and Pole Determinations for Asteroids 31 Euphrosyne, 196 Philomena, and 471 PapagenaWe present lightcurves ofasteroids 31 Euphrosyne, 196 Philomena and 471 Papagena and apply two different amplitude-aspect methods for pole and shape determination.Licandro, J. et al.
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41994 -
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Intense blazar activity in the photopolarimetric light curve of OJ 287We present a detailed analysis on photopolarimetric monitoring on OJ 287 conducted at the Nordic Optical Telescope during January 1991. Large rapid variations were observed in flux, polarization and position angle; the largest being a 40% increase in the flux with a simultaneous 55 degree position angle rotation in five hours. Changes in theTakalo, L. O. et al.
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41994 -
Evidence for supersonic downflows in the photosphere of a delta sunspotWe present polarization profiles observed with the High Altitude Observatory/National Solar Observatory (HAO/NSO) Advanced Stokes Polarimeter (ASP) that demonstrate, in a model-independent way, the presence of strong downflows close to the neutral line of a delta sunspot (a spot with both polarities contained within the same penumbra). The flowsMartinez Pillet, V. et al.
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41994