GSC 01230-00919 , the SIMBAD biblio

Magnitudes and color indices of 138 stars down to V = 15 mag in the seven-color Vilnius photometric system are determined in the area of the Aries molecular cloud MBM 12. Spectral types, color excesses, interstellar extinctions and distances of stars are determined from the photometric data. For some stars classification is verified from spectrograms. The plot of extinction vs. distance exhibits a steep rise of the extinction up to 4 mag at 300 pc which corresponds to the distance of the dust cloud at 375 pc. However, this distance may be overestimated if the heavily reddened stars found in the present study are not inside the cloud, but behind it. Additionally, a small bump of the extinction is present at 100-140 pc which can be related to the extension of the Taurus-Auriga dark cloud complex. Four known T Tauri type stars were measured and classified, and their variability confirmed. Two new T Tauri stars are suspected. More young objects may be present among the stars with peculiar color indices. Some of them can also be unresolved binaries. Some new heavily reddened stars are identified and discussed.