Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...410..269m&link_type=abstract
Astronomy and Astrophysics, v.410, p.269-282 (2003)
Astronomy and Astrophysics
Astrophysics
33
Stars: Binaries: Close, Stars: Formation
Scientific paper
We present the results of high-resolution spectroscopic observations carried out over three years aimed at estimating the short-period (P_orb<100 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{Ghezetal93}) and by Ghez et al. (\cite{Ghezetal97}) to detect wider components. When combining all four SFRs, the short-period binary frequency is indistinguishable from that found by Duquennoy & Mayor (\cite{DuqMay91}) for the solar-type field stars which is also consistent with the previous result obtained by Mathieu (\cite{Mathieu92}, \cite{Mathieu94}). 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{Mathieu92}) in Taurus. An excess of spectroscopic systems among the components of visual multiple systems is also observed.
Based on observations collected with the Swiss Euler Telescope and 1.5-m ESO, proposal 63.I-0112.
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