409 citations · 624 across the 16 of their papers we have counts for
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Hunting white dwarfs at the center of planetary nebulae
Javier Ahumada, Walter Weidmann, Marcelo Miller Bertolami +1
We present Gemini-South observations of nine faint and extended planetary nebulae. Using direct images taken with the spectrograph GMOS, we built the vs. di…
Improved spectral descriptions of planetary nebulae central stars
Walter Weidmann, Roberto Mendez, Roberto Gamen
Context. At least 492 central stars of Galactic planetary nebulae (CSPNs) have been assigned spectral types. Since many CSPNs are faint, these classification efforts are frequently…
Photometric and spectroscopic variations of the Be star HD 112999
M. A. Corti, R. C. Gamen, Y. J. Aidelman +2
Be objects are stars of B spectral type showing lines of the Balmer series in emission. The presence of these lines is attributed to the existence of an extended envelope, disk typ…
Central Stars of Galactic Planetary Nebulae II New OB-type and emission-line stars
Walter Weidmann, Roberto Gamen
Context. There are more than 3000 confirmed and probable known Galactic planetary nebulae, but central star spectroscopic information is available for only 13% of them. Aims. We un…