An in-depth analysis of the RZ Piscium atmosphere

¹ Pulkovo Astronomical Observatory, Russian Academy of Sciences, 196140 Pulkovo, St. Petersburg, Russia
e-mail: ilya.astro@gmail.com
² The Sobolev Astronomical Institute, St. Petersburg University, 198504 Petrodvorets, St. Petersburg, Russia
³ Leibnitz Institute of Astronomy, 14482 Potsdam, Germany
⁴ Crimean Astrophysical Observatory, P. Nauchny, 98409 Crimea, Ukraine

Received: 28 January 2014
Accepted: 11 February 2014

Abstract

The star RZ Psc is one of the most unusual members of the UX Ori star family. It demonstrates all properties that are typical of these stars (the light variability, high linear polarization in deep minima, the blueing effect), but until recently there has been no obvious evidence of its youth. Recently, we have shown that RZ Psc is in the transitional evolutionary stage between stars with the primordial and debris disks. In this paper we present the results of the quantitative analysis of the star’s spectrum. Using the high-resolution (R = 46 000) spectrum of RZ Psc obtained with Nordic Optical Telescope, we determined T_eff = 5350 ± 150 K, log g = 4.2 ± 0.2, [M/H] = −0.3 ± 0.05. These parameters agree well with the same ones as for the stars recently passed the T Tauri star evolutionary stage. This supports our previous suggestion about the evolutionary status of RZ Psc as the post-T Tauri and post-UX Ori star.