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The M31 globular cluster system: ugriz and K‐band photometry and structural parameters
We present an updated catalogue of M31 globular clusters (GCs) based on images from the Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope and from the Sloan Digital Sky SurveyExpand
Hubble Space Telescope Detection of Optical Companions of WR 86, WR 146, and WR 147: Wind Collision Model Confirmed
Hubble Space Telescope (HST) Wide Field Planetary Camera 2 images of the rado-binary Wolf-Rayet stars WR 146 and WR 147, as well as the 02 visual binary WR 86, resolve each of them into two veryExpand
Two Groups of Nearly Coeval Star Clusters in the Small Magellanic Cloud
We report new photometry and main-sequence turnoff ages for seven populous star clusters in the SMC with MV < -6 and age greater than 1 Gyr, using the Wide Field Planetary Camera 2 on board theExpand
The chandra fornax survey. I. The cluster environment
We present the first results of a deep Chandra survey of the inner ~1° of the Fornax cluster of galaxies. Ten 50 ks pointings were obtained in a mosaic centered on the giant elliptical galaxy NGCExpand
New Photometry for the Intermediate-Age Large Magellanic Cloud Globular Cluster NGC 2121 and the Nature of the LMC Age Gap*
We report new photometry for the cluster NGC 2121 in the Large Magellanic Cloud, which shows a prominent hydrogen core exhaustion gap at the turnoff and a descending subgiant branch reminiscent ofExpand
Hubble Space Telescope NICMOS Variability Study of Massive Stars in the Young Dense Galactic Starburst NGC 3603
We have used the relatively long data string of the 1997–1999 NICMOS focus tests on NGC 3603 to extract ~J-band light curves for several hundred stars in the cluster core. Given the relatively modestExpand
Proper-motion age dating of the progeny of Nova Scorpii AD 1437
The recovery of the binary star underlying the classical nova eruption of 11 March AD 1437 is reported, and its age is independently confirmed by proper-motion dating to conclude that many old novae become dwarf novae for part of the millennia between successive nova eruptions. Expand
GK Per (Nova Persei 1901): HST Imagery and Spectroscopy of the Ejecta, and First Spectrum of the Jet-Like Feature
We have imaged the ejecta of GK Persei (Nova Persei 1901 A.D.) with the Hubble Space Telescope (HST), revealing hundreds of cometary-like structures. One or both ends of the structures often show aExpand
Seitenzahl et al. (2009) have predicted that roughly three years after its explosion, the light we receive from a Type Ia supernova (SN Ia) will come mostly from reprocessing of electrons and X-raysExpand