Issue |
A&A
Volume 410, Number 1, October IV 2003
|
|
---|---|---|
Page(s) | 269 - 282 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20031242 | |
Published online | 17 November 2003 |
The short period multiplicity among T Tauri stars *
European Southern Observatory, Casilla 19001, Santiago 19, Chile Observatoire de Genève, Ch. des Maillettes 51, 1290 Sauverny, Switzerland
Corresponding author: cmelo@eso.org
Received:
11
December
2002
Accepted:
30
July
2003
We present the results of high-resolution spectroscopic observations carried out
over three years aimed at estimating the short-period ( days) binary frequency of a sample of
T Tauri stars in Oph-Sco, Cha, Lup, CrA star forming regions (SFRs), already observed with high angular
resolution techniques by Ghez et al. ([CITE]) and by Ghez et al. ([CITE]) to detect
wider components. When combining all four SFRs, the short-period binary frequency is indistinguishable from that
found by Duquennoy & Mayor ([CITE]) for the solar-type field stars which is also consistent with the
previous result obtained by Mathieu ([CITE], [CITE]). When Oph-Sco is analyzed
separately, it seems that there is an excess of short-period binaries of a factor 2–2.5. On the contrary,
short-period binary systems seem to be absent in the sample containing stars in Cha/Lup/CrA. Such a trend was
equally found by Mathieu ([CITE]) in Taurus. An excess of spectroscopic systems among the components
of visual multiple systems is also observed.
Key words: stars: binaries: close / stars: formation
© ESO, 2003
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