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Star Clusters in Local Group Galaxies
Eva K. Grebel
In about 40% of the Local Group galaxies star clusters have been detected so far, but the census is still incomplete. The properties of these clusters are briefly reviewed, and the…
The dwarf spheroidal galaxy DDO 44: stellar populations and distance
I. D. Karachentsev, M. E. Sharina, E. K. Grebel +7
We present ground-based and HST WFPC2 imaging of the nearby low surface brightness dwarf spheroidal galaxy DDO 44. For the first time DDO 44 was resolved into stars. The resulting…
HST/WFPC2 and VLT/ISAAC observations of PROPLYDS in the giant HII region NGC 3603
W. Brandner, E. K. Grebel, Y. -H. Chu +6
We report the discovery of three proplyd-like structures in the giant HII region NGC 3603. The emission nebulae are clearly resolved in narrow-band and broad-band HST/WFPC2 observa…
A New Culprit in the Second Parameter Problem in the Sculptor Dwarf Spheroidal Galaxy?
D. Hurley-Keller, M. Mateo, E. Grebel
Color-magnitude diagrams from deep, wide-field CCD photometry of the Sculptor dwarf spheroidal galaxy reveal that the red horizonal branch (RHB) stars are strongly concentrated tow…
The Type Ia Supernova 1998bu in M96 and the Hubble Constant
S. Jha, P. Garnavich, R. Kirshner +39
We present optical and near-infrared photometry and spectroscopy of the type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measure…
Differences in the fractions of Be stars in galaxies
A. Maeder, E. Grebel, J. -C. Mermilliod
The number ratios Be/(B+Be) of Be to B-type stars in young, well studied clusters of the Galaxy, the LMC and SMC are examined. In order to disentangle age and metallicity effects w…