Binary Search Among X-ray Active Stars South of the Taurus Molecular Cloud.

Details Binary Search Among X-ray Active Stars South of the Taurus Molecular Cloud. Binary Search Among X-ray Active Stars South of the Taurus Molecular Cloud.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1555s&link_type=abstract

The Astronomical Journal, v. 114, p. 1555.

Astronomy and Astrophysics

Astronomy

7

X-Rays: Stars, Stars: Evolution, Ism: Clouds

Scientific paper

We have conducted an R-band imaging survey of a ROSAT x-ray selected sample of 99 stars south of the Taurus-Auriga association using the WIYN 3.5 m telescope under subarcsec seeing conditions (typically ˜′′.7). Recent optical spectroscopic identifications show that this sample contains 17 Pleiades-like stars, 17 emission-line stars, 32 active corona stars, and 32 stars judged to be younger than the Pleiades by the strength of their lithium absorption. A considerable fraction of these young Li-rich stars are probably weak-line T Tauri stars (TTS). In total, we resolve 21 binary stars, 3 of them having separations less than 1′′.0. Within the young Li-rich subsample, we find 9 companions in the separation range between 0′′.6 and 14′′.0. The visual binary fractions among the young and active stars within the sample are similar and compatible with expectations from main-sequence field stars in the solar neighborhood. We discuss some implications of these results for understanding the nature of the widespread, X-ray active, young stellar population recently identified around nearby star forming regions.

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