The pre-main sequence spectroscopic binary UZ Tau East: Improved orbital parameters and accretion phase dependence

    Authors

    E. L. Martin; A. Magazzu; X. Delfosse;R. D. Mathieu

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Astron. Astrophys.

    Keywords

    stars : binaries : spectroscopic; stars : formation; stars : late-type; stars : pre-main sequence; accretion, accretion disks; stars : planetary; systems : protoplanetary disks; LOW-MASS STARS; AK-SCORPII; LINE; Astronomy & Astrophysics

    Abstract

    We present radial-velocity measurements obtained using high- and intermediate-resolution spectroscopic observations of the classical T Tauri star UZ Tau East from 1994 to 1996. We also provide measurements of Ha equivalent widths and optical veiling. Combining our radial-velocity data with those recently reported by Prato et al. (2002), we improve the orbital elements for this spectroscopic binary. The orbital period is 18.979 +/- 0.007 days and the eccentricity is e = 0.14. We find variability in the Ha emission and veiling, signposts of accretion, but at periastron passage the accretion is not as clearly enhanced as in the case of the binary DQ Tau. The difference in the behaviour of these two binaries is consistent with the hydrodynamical models of accretion from circumbinary disks because UZ Tau East has lower eccentricity than DQ Tau. It seems that enhanced periastron accretion may occur only in systems with very high eccentricity (e > 0.5).

    Journal Title

    Astronomy & Astrophysics

    Volume

    429

    Issue/Number

    3

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    939

    Last Page

    943

    WOS Identifier

    WOS:000226294600021

    ISSN

    0004-6361

    Share

    COinS