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Surprising variations in the rotational periods of CP stars CU Virginis and V901 Orionis

MIKULÁŠEK, Zdeněk

Basic information

Original name

Surprising variations in the rotational periods of CP stars CU Virginis and V901 Orionis

Name in Czech

Překvapující změny v rotačních periodách CP hvězd CU Virginis a V901 Orionis

Authors

MIKULÁŠEK, Zdeněk (203 Czech Republic, guarantor, belonging to the institution)

Edition

Seminář stelárního oddělení AsÚ AV ČR v Ondřejově, 2012

Other information

Language

English

Type of outcome

Vyžádané přednášky

Field of Study

10308 Astronomy

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/00216224:14310/12:00057251

Organization unit

Faculty of Science

Keywords (in Czech)

CP hvězdy; rotace

Keywords in English

CP stars; rotation
Změněno: 10/4/2012 14:15, prof. RNDr. Zdeněk Mikulášek, CSc.

Abstract

ORIG CZ

V originále

We studied the stability of the periods of well observed mCP stars CU Vir and V901 Ori using all accessible data containing phase information. We found that both stars exhibit alternating intervals of rotational braking and acceleration. We propose that dynamical interaction between a thin, outer magnetically-confined envelope, braked by the stellar wind, with an inner stellar body is able to explain the observed rotational instability. A theoretically unexpected alternating variability in these stars would remove the spin-down paradox and brings a new insight into structure and evolution of some magnetic upper-main sequence stars.

In Czech

We studied the stability of the periods of well observed mCP stars CU Vir and V901 Ori using all accessible data containing phase information. We found that both stars exhibit alternating intervals of rotational braking and acceleration. We propose that dynamical interaction between a thin, outer magnetically-confined envelope, braked by the stellar wind, with an inner stellar body is able to explain the observed rotational instability. A theoretically unexpected alternating variability in these stars would remove the spin-down paradox and brings a new insight into structure and evolution of some magnetic upper-main sequence stars.

Links

GA205/08/0003, research and development project
Name: Předpovědi rychlosti ztráty hmoty horkých hvězd
Investor: Czech Science Foundation, Mass-loss rate predictions for hot stars