Optical spectroscopy of Post-T Tauri star candidates

Details Optical spectroscopy of Post-T Tauri star candidates Optical spectroscopy of Post-T Tauri star candidates

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..245p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 245-254.

Astronomy and Astrophysics

Astrophysics

33

Astronomical Spectroscopy, Binary Stars, Stellar Evolution, T Tauri Stars, Abundance, Charge Coupled Devices, H Alpha Line, Hertzsprung-Russell Diagram, Lithium

Scientific paper

We report on spectroscopic observations of Post-T Tauri star candidates carried out using various instruments at ESO. The program stars were taken from the list of Lindroos (1986) and are late-type secondaries of visual binaries with early-type primaries. If the binaries are physical and not just optical pairs, their late type secondaries should still be contracting toward the ZAMS, or should have recently arrived upon it. Lindroos proposed all these stars as likely members of physical systems. We have observed spectroscopically 37 of the 41 secondaries in Lindroos' list classified of spectral type later than F2. We have also observed two additional systems that were discarded by Lindroos as likely optical pairs. For all 39 objects, we obtained moderate resolution (about 2 A) spectra in a region comprising the Li I 6708-A line and H-alpha. For 32 of these, we also obtained moderate resolution (about 1 A) spectra in the Ca II H and K lines. A few bright objects were also observed at high resolution (about 0.1 A) in the red. From our spectroscopic results we conclude that only a small fraction (less than 40 percent) of the surveyed stars show clear evidence of youth, the others being more likely optical pairs. All stars that appear to be young are located in the HR diagram very close to the ZAMS.

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