A database of circumstellar OH masers
  We present a new database of circumstellar OH masers at 1612, 1665, and 1667
MHz in the Milky Way galaxy. The database (version 2.4) contains 13655
observations and 2341 different stars detected in at least one transition.
Detections at 1612\,MHz are considered to be complete until the end of 2014 as
long as they were published in refereed papers. Detections of the main lines
(1665 and 1667 MHz) and non-detections in all transitions are included only if
published after 1983. The database contains flux densities and velocities of
the two strongest maser peaks, the expansion velocity of the shell, and the
radial velocity of the star. Links are provided for about 100 stars ($<$5\% of
all stars with OH masers) to interferometric observations and monitoring
programs of the maser emission published since their beginnings in the 1970s.
Access to the database is possible over the Web
(www.hs.uni-hamburg.de/maserdb), allowing cone searches for individual sources
and lists of sources. A general search is possible in selected regions of the
sky and by defining ranges of flux densities and/or velocities. Alternative
ways to access the data are via the German Virtual Observatory and the VizieR
library of astronomical catalogs.
