Lithium and rotation on the subgiant branch. I. Observations and spectral analysis

Details Lithium and rotation on the subgiant branch. I. Observations and spectral analysis Lithium and rotation on the subgiant branch. I. Observations and spectral analysis

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345..936l&link_type=abstract

Astronomy and Astrophysics, v.345, p.936-942 (1999)

Astronomy and Astrophysics

Astrophysics

46

Line: Profiles, Stars: Abundances, Stars: Rotation

Scientific paper

We have obtained new high resolution spectroscopic observations of the lithium line at 6707.81 Angstroms and derived lithium abundances (A_Li ) by spectral synthesis for a sample of about 120 F-, G- and K-type Population I subgiant stars. For each of these stars, high precision rotational velocity obtained with the CORAVEL spectrometer is available. We present the behavior of the lithium abundance as a function of effective temperature, which shows a sort of discontinuity around 5600 K, somewhat later than the well known rotational discontinuity. based on observations collected at the Observatoire de Haute--Provence (France) and at the European Southern Observatory, La Silla (Chile).

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