TY - JOUR

T1 - Color Indices of T Tauri Stars in Variable Circumstellar Extinction Models

AU - Dmitriev, D. V.

AU - Grinin, V. P.

AU - Barsunova, O. Yu

N1 - Dmitriev, D.V., Grinin, V.P. & Barsunova, O.Y. Color Indices of T Tauri Stars in Variable Circumstellar Extinction Models. Astron. Lett. 47, 19–27 (2021). https://doi.org/10.1134/S1063773721010035

PY - 2021/1

Y1 - 2021/1

N2 - Variable circumstellar extinction models as applied to T Tauri stars are considered. In contrast to hotter UX Ori stars, for which simplified eclipse models are applicable, the star is deemed a point source of light, while the circumstellar dust clouds obscuring the star are assumed to be homogeneous. In the case considered here, both these simplifications may not work. Hot accretion spots are formed through accretion on T Tauri stars, while the dust structures obscuring the star from the observer can be inhomogeneous within the stellar disk. The families of color-magnitude diagrams have been computed by taking into account these two factors. It is shown that in such models the color tracks on the diagrams can differ greatly in shape from those computed in eclipse models for hot UX Ori stars. The results obtained may be applicable to AA Tau stars demonstrating eclipses by the inner circumstellar disk regions.

AB - Variable circumstellar extinction models as applied to T Tauri stars are considered. In contrast to hotter UX Ori stars, for which simplified eclipse models are applicable, the star is deemed a point source of light, while the circumstellar dust clouds obscuring the star are assumed to be homogeneous. In the case considered here, both these simplifications may not work. Hot accretion spots are formed through accretion on T Tauri stars, while the dust structures obscuring the star from the observer can be inhomogeneous within the stellar disk. The families of color-magnitude diagrams have been computed by taking into account these two factors. It is shown that in such models the color tracks on the diagrams can differ greatly in shape from those computed in eclipse models for hot UX Ori stars. The results obtained may be applicable to AA Tau stars demonstrating eclipses by the inner circumstellar disk regions.

KW - accretion spots

KW - T Tauri stars

KW - variable circumstellar extinction

UR - http://www.scopus.com/inward/record.url?scp=85103291669&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f0e8e5b8-4c55-3c73-b799-4bf9866c07c5/

U2 - 10.1134/s1063773721010035

DO - 10.1134/s1063773721010035

M3 - Article

AN - SCOPUS:85103291669

VL - 47

SP - 19

EP - 27

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 1

ER -