  We analyze the correlation between properties of large-scale bars and atomic
gas content of galaxies to explore the role of HI gas on bar evolution in
galaxies. We show that the absolute bar size depends strongly on total stellar
mass of galaxies and does not change significantly with HI gas fraction at
fixed stellar mass. Furthermore, the physical size of the bar is small and
nearly constant in high Hi gas fraction and low-mass galaxies, and becomes
larger with increasing galactic stellar mass in low gas fraction galaxies. When
the stellar masses are fixed, the relative bar length normalized to the disk
shows a decrease with increasing HI gas fraction due to the larger disks in
gas-richer galaxies. We measure the gas deficiency of the samples and find that
the gas-rich galaxies have longer and stronger bars compared with the Hi
gas-deficient galaxies at fixed stellar mass, especially for the massive ones.
When splitting the samples into star forming and quiescent subgroups, the star
forming galaxies tend to have longer bars than the quiescent ones at fixed
stellar mass and gas deficiency. In addition, our results suggest two different
types of bar properties, in which the bars in gas-rich galaxies grow longer but
retain similar axial ratio over time, while they grow longer and fatter over
time in gas-poor galaxies.
