文章基本信息

标题：Accretion and outflow activity on the late phases of pre-main-sequence evolution - The case of RZ Piscium
其他标题：The case of RZ Piscium
本地全文：下载
作者：I. S. Potravnov ; I. S. Potravnov ; D. E. Mkrtichian 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：599
页码：1-9
DOI：10.1051/0004-6361/201628926
语种：English
出版社：EDP Sciences
摘要：RZ Psc is an isolated high-latitude post-T Tauri star that demonstrates a UX Ori-type photometric activity. The star shows very weak spectroscopic signatures of accretion, but at the same time possesses the unusual footprints of the wind in Na i D lines. In the present work we investigate new spectroscopic observations of RZ Psc obtained in 2014 during two observation runs. We found variable blueshifted absorption components (BACs) in lines of the other alcali metals, K i 7699 Å and Ca ii IR triplet. We also confirmed the presence of a weak emission component in the Hα line, which allowed us to estimate the mass accretion rate on the star as Ṁ ≤ 7 × 10-12M⊙ yr-1. We could not reveal any clear periodicity in the appearance of BACs in sodium lines. Nevertheless, the exact coincidence of the structure and velocities of the Na i D absorptions observed with the interval of about one year suggests that such a periodicity should exist.
关键词：stars: variables: T Tauri, Herbig Ae/Be;stars: pre-main sequence;stars: individual: RZ Piscium;accretion, accretion disks