Barium-rich G stars in the nuclei of the planetary nebulae Abell 35 and LoTr5.

Details Barium-rich G stars in the nuclei of the planetary nebulae Abell 35 and LoTr5. Barium-rich G stars in the nuclei of the planetary nebulae Abell 35 and LoTr5.

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..913t&link_type=abstract

Astronomy and Astrophysics, v.320, p.913-919

Astronomy and Astrophysics

Astrophysics

16

Planetary Nebulae: Individual: Abell 35, Pn Lotr 5, Stars: Binaries, Stars: Abundances, Stars: Chemically Peculiar

Scientific paper

A spectroscopic analysis of the G-star located at the centre of Abell 35 leads to a surface gravity logg=3.7+/-0.5 and an effective temperature T_eff_=5300+/-200K, which are typical of a G8IV spectral type. We estimate a projected rotational velocity of 55+/-10km/s and deduce a radius 1.5<=R_G_<=3.5Rsun_ in agreement with the subgiant luminosity class: the star is rapidly rotating, near the break-up as for LoTr5 (Jasniewicz et al. 1996A&A...307..200J). For both late-type central stars of Abell 35 and LoTr5, we show a photospheric enhancement of the barium element which can be understood as caused by the transfer of s-process-overabundant material from the former AGB star which is now the hot star of the binary. These G-stars could be pre-barium stars in detached binary systems.

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