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

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Flares of accretion activity of the 20 Myr old UXOR RZ Psc. / Potravnov, I. S.; Grinin, V. P.; Serebriakova, N. A.

In: Astronomy and Astrophysics, Vol. 630, A64, 01.10.2019.

Research output: Contribution to journal › Article › peer-review

Author

Potravnov, I. S. ; Grinin, V. P. ; Serebriakova, N. A. / Flares of accretion activity of the 20 Myr old UXOR RZ Psc. In: Astronomy and Astrophysics. 2019 ; Vol. 630.

BibTeX

@article{8f0ad78420694a05ad6ee422a21f0d77,

title = "Flares of accretion activity of the 20 Myr old UXOR RZ Psc",

abstract = "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 Ca » II 8542 {\AA} lines. The simultaneous presence of accretion and outflow signatures at Ca » II 8542 {\AA} 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+3 Myr. ",

keywords = "Accretion, Accretion disks, Stars: individual: RZ Psc, Stars: kinematics and dynamics, Stars: late-type, Stars: pre-main sequence",

author = "Potravnov, {I. S.} and Grinin, {V. P.} and Serebriakova, {N. A.}",

note = "Publisher Copyright: {\textcopyright} ESO 2019.",

year = "2019",

month = oct,

day = "1",

doi = "10.1051/0004-6361/201935492",

language = "English",

volume = "630",

journal = "ASTRONOMY & ASTROPHYSICS",

issn = "0004-6361",

publisher = "EDP Sciences",

}

RIS

TY - JOUR

T1 - Flares of accretion activity of the 20 Myr old UXOR RZ Psc

AU - Potravnov, I. S.

AU - Grinin, V. P.

AU - Serebriakova, N. A.

N1 - Publisher Copyright: © ESO 2019.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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 Ca » II 8542 Å lines. The simultaneous presence of accretion and outflow signatures at Ca » II 8542 Å 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+3 Myr.

AB - 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 Ca » II 8542 Å lines. The simultaneous presence of accretion and outflow signatures at Ca » II 8542 Å 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+3 Myr.

KW - Accretion

KW - Accretion disks

KW - Stars: individual: RZ Psc

KW - Stars: kinematics and dynamics

KW - Stars: late-type

KW - Stars: pre-main sequence

UR - http://www.scopus.com/inward/record.url?scp=85087040116&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201935492

DO - 10.1051/0004-6361/201935492

M3 - Article

AN - SCOPUS:85087040116

VL - 630

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

M1 - A64

ER -

ID: 87423873