HD 195019

Central star of the HD 195019 system.

HD 195019 (HIP 100970) is spectral type G3 V/IV. This star has a companion, ADS 13886B, that is fainter by 3 mag and separated by about 4. The linear separation of the two components is about 150 AU.

Composition

The spectral lines are narrow, which supports slow stellar rotation, and a radial velocity of -93.1 ± 2 km s-1 is estimated. The space motions for this star are consistent with those of old disk stars. There are two possible explanations that we cannot distinguish between at this time. If the Ca II H and K diagnostic is correct, then the star could be metal rich. We estimate that [Fe/H] +0.30 could result in the observed shift for this star. If HD 195019 is metal rich, it may be akin to Tau Bootis, which has [Fe/H] = +0.25. Alternatively, the star may be slightly evolved with solar metallicity, consistent with the luminosity classification and observed space motions. In either case, the chromospheric activity in this star is low, and we expect that activity-associated spots are an unlikely explanation for the observed Doppler shifts.