Volume 410, Number 1, October IV 2003
|Page(s)||269 - 282|
|Section||Stellar structure and evolution|
|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: firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.