70 citations · 120 across the 10 of their papers we have counts for
4 papers · 2 filters
The evolutionary phase of B[e] supergiants and unclassified B[e] stars
Michaela Kraus
We present two classes of stars with yet unknown evolutionary phase: the B[e] supergiants and the so-called unclassified B[e] stars. While the B[e] supergiants are luminous post-ma…
The enigmatic B[e] star Hen 2-90 -- an interacting binary?
Michaela Kraus, Marcelo Borges Fernandes, Francisco X. de Araujo
We present the enigmatic galactic unclassified B[e] star Hen 2-90. Its optical spectrum is discussed and analysed in terms of the forbidden emission lines coming from a non-spheric…
The outflowing disks of B[e] supergiants and unclassified B[e] stars
Michaela Kraus, Marcelo Borges Fernandes
B[e] supergiants are known to possess outflowing cool disks but also some unclassified B[e] stars show clear indications for the presence of a neutral disk. We derive constraints o…
Parameters of PNe: constant density versus density distribution
Michaela Kraus
We derive the stellar and circumstellar parameters of the Galactic compact planetary nebula Hen 2-90 with two models: the classical constant density nebula model where the emission…