Search Publications

Hubble Space Telescope-WFPC2/Hα Observations of the Ejected Nebula M1-67

Moffat, Anthony F. J.; Grosdidier, Yves; Acker, Agnès

We present HST-WFPC2/Hα deep images of the ejected nebula M1-67. Our data suggest that M1-67 is the imprint of a previous, slow LBV wind ejected from the central star WR124, now a WN8 star. We find evidence that the LBV wind is highly variableand anisotropic. Some dense, persisting clumps have possibly been ejected directly from the stellar surfac…

Blue Compact Galaxies at Redshifts Z=0.2-1.3

Guzmán, R.

We study the nature of faint blue compact galaxies (BCGs) at redshifts z ∼ 0.2 - 1.3 using Keck and HST. Despite being very luminous (L_B ∼ L^*), most distant BCGs have masses M ∼ 10¹⁰M_⊙, i.e., they are dwarf stellar systems. The majority of these galaxies have colors, sizes, surface brightnesses, luminosi…

Observation of Microstructures in Planetary Nebulae

Walsh, J. R.; Dudziak, G.

HST images of 5 Planetary nebulae showing small scale structures have been retrieved from the archives. For two PNe, NTT images were also available, and a double channel deconvolution technique applied to combine them to the HST images. A very precise flux calibration was performed on the HST images. Bow shocks and ionization effects are likely de…