The Sejong Open cluster Survey (SOS) VI. A small star-forming region in
  the high Galactic latitude molecular cloud MBM 110
  We present optical photometric, spectroscopic data for the stars in the high
Galactic latitude molecular cloud MBM 110. For the complete membership
selection of MBM 110, we also analyze WISE mid-infrared data and Gaia
astrometric data. Membership of individual stars is critically evaluated using
the data mentioned above. The Gaia parallax of stars in MBM 110 is 2.667 +/-
0.095 mas (d = 375 +/- 13 pc), which confirms that MBM 110 is a small
star-forming region in the Orion-Eridanus superbubble. The age of MBM 110 is
between 1.9 Myr and 3.1 Myr depending on the adopted pre-main sequence
evolution model. The total stellar mass of MBM 110 is between 16 M_sun (members
only) and 23 M_sun (including probable members). The star formation efficiency
is estimated to be about 1.4%. We discuss the importance of such small star
formation regions in the context of the global star formation rate and suggest
that a galaxy's star formation rate calculated from the Halpha luminosity may
underestimate the actual star formation rate. We also confirm a young brown
dwarf member based on photometry, spectroscopy, and astrometry.
