Catalogue of central stars of planetary nebulae: Expanded edition
  Planetary nebulae represent a potential late stage of stellar evolution,
however the central stars (CSPNe) are relatively faint and therefore pertinent
information is merely available for <20% of the Galactic sample. Consequently,
the literature was surveyed to construct a new catalogue of 620 CSPNe featuring
important spectral classifications and information. The catalogue supersedes
the existing iteration by 25%, and includes physical parameters such as
luminosity, surface gravity, temperature, magnitude estimates, and references
for published spectra. The marked statistical improvement enabled the following
pertinent conclusions to be determined: the H-rich/H-poor ratio is 2:1, there
is a deficiency of CSPNe with types [WC 5-6], and nearly 80% of binary central
stars belong to the H-rich group. The last finding suggests that evolutionary
scenarios leading to the formation of binary central stars interfere with the
conditions required for the formation of H-poor CSPN. Approximately 50% of the
sample with derived values of log L, log Teff, and log g, exhibit masses and
ages consistent with single stellar evolutionary models. The implication is
that single stars are indeed able to form planetary nebulae. Moreover, it is
shown that H-poor CSPNe are formed by higher mass progenitors. The catalogue is
available through the Vizier database.
