Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.1106m&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #11.06; Bulletin of the American Astronomical Society, Vol. 34, p.659
Astronomy and Astrophysics
Astronomy
Scientific paper
We present here the results of evolutionary models on deuterium and lithium burning in sub-stellar mass objects. We demonstrate that the lower mass limits for which deuterium burning and lithium burning become important depend sensitively upon the object's metallicity, the object's helium mass fraction, and the specific atmospheric model and boundary conditions being employed. The mass for which the sub-stellar object burns 50% of its deuterium can vary from ~ 11.9 MJup to ~ 14.1MJup as the metallicity is varied from z=1 to z=0.001. Similarly, the mass for which 50% of the lithium is burned varies by ~ 0.01 MSun as the helium mass fraction is varied from 0.22 to 0.32. These considerations are important for observers using ``lithium tests'' or ``deuterium tests'' to determine the masses and/or ages of specific objects and are mildly relevant to those who would use the ``deuterium limit" to demarcate the boundary between planets and brown dwarfs. We are happy to acknowledge support from NASA under grants NAG5-10760 and NAG5-10629.
Burrows Adam
Milsom John A.
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