Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...476l..89p&link_type=abstract
Astrophysical Journal Letters v.476, p.L89
Astronomy and Astrophysics
Astronomy
15
Stars: Chemically Peculiar, Stars: Abundances, Stars: Agb And Post-Agb, Stars: White Dwarfs
Scientific paper
The young solar-type star HR 6094 is found to be a barium dwarf, overabundant in the s-process elements as well as deficient in C. It is a member of the solar-metallicity, 0.3 Gyr old Ursa Major kinematical group. Measurements of radial velocity and ultraviolet flux do not support the attribution of such abundance anomalies to an unseen degenerate companion. A common proper motion, V = 10, DA white dwarf (WD), located 5360 AU away, however, strongly supports the explanation of the origin of this barium star by the process of mass transfer in a binary system, in which the secondary component accreted matter from the primary one (now the WD) when it was an asymptotic giant branch (AGB) star self-enriched in the s-process elements. The membership in the UMa group of another s-process--rich and C-deficient star, HR 2047, suggests that these stars could have formed a multiple system in the past, which was disrupted by the mass-loss episode of the former AGB star. Their [C/Fe] deficiency could be explained by the action of the hot-bottomed envelope burning process in the late AGB, thereby reconverting it from a C-rich to an O-rich star, depleting C while enriching its envelope with Li and neutron capture elements. This is the first identification of the barium phenomenon in a near--zero-age star, besides being the first barium system in which the remnant of the late AGB star responsible for the heavy-element enrichment may have been directly spotted.
da Silva Loureiro L.
Porto de Mello Gustavo F.
No associations
LandOfFree
HR 6094: A Young, Solar-Type, Solar-Metallicity Barium Dwarf Star does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with HR 6094: A Young, Solar-Type, Solar-Metallicity Barium Dwarf Star, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HR 6094: A Young, Solar-Type, Solar-Metallicity Barium Dwarf Star will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1775743