SIMBAD references

2019A&A...630A..64P - Astronomy and Astrophysics, volume 630A, 64-64 (2019/10-1)

Flares of accretion activity of the 20 Myr old UXOR RZ Psc.

POTRAVNOV I.S., GRININ V.P. and SEREBRIAKOVA N.A.

Abstract (from CDS):

We discuss a revision of accretion activity and kinematics of the enigmatic isolated UX Ori type star RZ Psc. Previously, RZ Psc was known to possess only spectroscopic signatures of outflow in the low-excitation lines of alkali metals. The archival high-resolution spectra reveal a short-lived episode of magnetospheric accretion in the system observed via inverse P Cyg profiles at the Hα and CaII 8542Å lines. The simultaneous presence of accretion and outflow signatures at CaII 8542Å is suggestive of an accretion-driven origin of the RZ Psc wind. We argue that RZ Psc experiences matter ejection via the magnetic propeller mechanism but variable accretion episodes allow it to sometimes move in the magnetospheric accretion regime. The presence of the weak accretion in the system is also supported by the radiation of the hot accretion spot on the stellar surface observed spectroscopically at the deep photometric minimum of the star. The Galactic motion of RZ Psc calculated with new Gaia DR2 astrometric data suggests possible membership in Cas-Tau OB association with an age of t=20–5+3Myr.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: individual: RZ Psc - stars: pre-main sequence - stars: late-type - stars: kinematics and dynamics - accretion - accretion disks

Simbad objects: 5

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