We present polarization profiles observed with the High Altitude Observatory/National Solar Observatory (HAO/NSO) Advanced Stokes Polarimeter (ASP) that...
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PublicationEvidence for supersonic downflows in the photosphere of a delta sunspot
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PublicationEvolutionary versus dynamical time scales for the evolution of the central stars of planetary nebulae
The disagreement between evolutionary and dynamical time scales for the evolution of the central stars of planetary nebulae (CSPN) through the H-R diagram is...
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PublicationExtended nonnuclear infrared emission from Seyfert galaxies
The IRAS observations of well-known Seyfert galaxies have been studied in comparison with previously published ultraviolet and mid-infrared data. The mid- and...
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PublicationExtreme nitrogen enrichment in the asymmetrical planetary nebulae M1-75
In the framework of the morphological survey of northern sky planetary nebulae, in progress at the IAC we investigate in detail those nebulae that show...
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PublicationForces on magnetic flux tubes moving in inhomogeneous flows
The back-reaction of an incompressible two-dimensional flow of constant strain to the accelerated motion of a straight cylinder is calculated in the general...
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PublicationGamma-ray observations of the Crab Nebula at TeV energies
A new series of observation of the Crab Nebula in TeV gamma rays using an improved camera on the Whipple Observatory 10 m Optical Reflector is reported. The...
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PublicationGlobal acoustic oscillations on Alpha Bootis
A two-week time series of precise radial velocity measurements of Alpha Bootis (Arcturus) covering 7-8 hr per night is reported. The radial barycentric velocity...
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PublicationHidden supernova remnants in the Large Magellanic Cloud H II complex N44
We have obtained ROSAT PSPC observations of N44, one of the largest H II complexes in the Large Magellanic Cloud. The X-ray emission mostly fails within the...
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PublicationInfrared photometry of Seyfert 1.8 and 1.9 galaxies
Infrared photometry is reported from 1.25 to 10 micrometers for 10 Seyfert 1.8 and 1.9 galaxies identified by Osterbrock and his collaborators and drawn...