Abstract:
Actively accreting young stellar objects show Hα emission line in their spectra. We present the
results of survey for Hα emission-line stars in the star-forming region IC 5070 taken with 2-m Himalyan
Chandra Telescope. Based on the Hα slitless spectroscopy data, we identified 131 emission-line stars in ∼0.29
square degrees area of the IC 5070 region. Using Gaia early data release 3, we estimated the mean proper motion
and parallax of the emission-line stars. We also estimated the mean distance and reddening toward the region
using the emission-line stars, which are ∼833 pc and ∼2 mag, respectively. By examining the locations of these
stars in the color–magnitude diagrams constructed using Gaia and PanSTARRS1 data, we found that a majority
of the Hα emitters are young low-mass (<1.5 M ) stars. We also compared our catalog of emission-line stars
with the available young stellar catalogs and found that most of them are class ii/flat spectrum sources with
the spectral type ranging from K to M. Based on the proper motion/parallax values and locations on the color–
magnitude diagrams, about 20 emission-line stars are flagged as non-members. The relative proper motion of
the emission-line stars with respect to the ionizing source suggest the possibility of the ‘rocket effect’ scenario
in the remnant cloud (BRC 31).
