IS PZ MON A RED DWARF OR A RED GIANT?

Анотація

Hipparcos data (ESA 1997) give for PZ Mon a parallax π = 0.71 +- 1.17 mas that is not in agreement with earlier estimations of distance to the star of 15-30 ps and with its status of K- dwarf. There are presented spectra of PZ Mon in the region 3750-6150 Α with resolution of 7 ≈ Α, which were carried out in the Nasmith focus of 2.6 m reflector in the Crimean Astrophysical observatory. Intensities of molecular absorptions in this spectral range are determined relative a nearby continuum and their relations between absolute magnitudes are considered. The calculated M_ν =6.74 and r=29 ps correspond to an earlier classiffication of PZ Mon as a red dwarf.