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An Accurate Age Determination for the SMC Star Cluster NGC121 with HST/ACS
K. Glatt, J. S. Gallagher, E. K. Grebel +8
As first Paper of a series devoted to study the old stellar population in clusters and fields in the Small Magellanic Cloud, we present deep observations of NGC121 in the F555W and…
V838 Monocerotis: A Geometric Distance from Hubble Space Telescope Polarimetric Imaging of its Light Echo
William B. Sparks, Howard E. Bond, Misty Cracraft +10
Following the outburst of the unusual variable star V838 Monocerotis in 2002, a spectacular light echo appeared. A light echo provides the possibility of direct geometric distance…
On the nature of optical nuclei in FR I radio-galaxies from ACS/HST imaging polarimetry
Alessandro Capetti, David J. Axon, Marco Chiaberge +4
We obtained optical imaging polarimetry with the ACS/HRC aboard the HST of the 9 closest radio-galaxies in the 3C catalogue with an FR I morphology. The nuclear sources seen in dir…
vbyCaHbeta CCD Photometry of Clusters. VI. The Metal-Deficient Open Cluster NGC 2420
Barbara J. Anthony-Twarog, Delora Tanner, Misty Cracraft +1
CCD photometry on the intermediate-band vbyCaHbeta system is presented for the metal-deficient open cluster, NGC 2420. Restricting the data to probable single members of the cluste…