Lithium in a Cool Red Giant Member of the Globular Cluster NGC 362

Details Lithium in a Cool Red Giant Member of the Globular Cluster NGC 362 Lithium in a Cool Red Giant Member of the Globular Cluster NGC 362

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...516l..73s&link_type=abstract

The Astrophysical Journal, Volume 516, Issue 2, pp. L73-L76.

Astronomy and Astrophysics

Astronomy

26

Galaxy: General, Globular Clusters: Individual (Ngc 288, Ngc 362), Stars: Abundances

Scientific paper

A surprisingly strong Li I lambda6707 feature has been identified in a red giant member of the globular cluster NGC 362. This giant, V2, is located near the tip of the red giant branch and could be either a first-ascent red giant or on the asymptotic giant branch. An abundance analysis finds the lithium abundance to be logɛ(Li)=1.2+/-0.2. Since almost all low-mass giants have destroyed and diluted their photospheric lithium abundances to much lower levels, the source of lithium in star V2 is a mystery. The solution to this mystery is suggested to reside in two possible mechanisms. The proposed deep-mixing mechanism called ``cool bottom processing'' can account for the observed lithium at this giant's luminosity [log(L/L_solar)=3.3] if the parameterized mixing speed, measured as log(dM/dt), is ~-5.5 (in units of M_solar yr^-1). An alternative source of the excess lithium could be the ingestion, into the red giant's convective envelope, of an ~0.04 M_solar object with an assumed undepleted, typical halo lithium abundance of logɛ(Li)=2.2.

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