Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..764z&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 3, pp. 764-772.
Astronomy and Astrophysics
Astronomy
48
Stars: Abundances, Stars: Agb And Post-Agb, Stars: Individual: Iras 22272+5435, Stars: Kinematics
Scientific paper
A new high-resolution, high signal-to-noise spectrum has been gathered for proto-planetary nebula candidate IRAS 22272+5435 using the 6-m telescope. The spectroscopic indicators provide the atmospheric parameters T_eff=5600K and log g=0.5 (cgs), approximately equal to those for G2 supergiants. We find that 22272+5435 is iron poor: [Fe/H]=-0.49 dex; however, other iron-peak elements are overabundant. The standard LTE analysis by the model atmospheres method shows that Li is overabundant in the atmosphere of 22272+5435. The carbon abundance based on three CI lines and oxygen abundance computed from the forbidden line at 6300.32A give C/O~12. The elements of the alpha-process are found to be overabundant relative to the solar ones, excluding Ca, which has a normal abundance. Heavy neutron-capture elements are overabundant (+2.0 dex on the average). The radial velocity derived from roughly 40 absorption lines is found to be -39.7 km s^-1, probably suggesting that 22272+5435 does not belong to the halo. The observed asymmetry of strong absorption lines may be the result of velocity gradients and likely mass outflow, in the atmosphere of the object. The radial velocity, low iron abundance, overabundance of carbon and s-process elements, and detached circumstellar shell suggest that 22272+5435 is an evolved low-mass star of the old (thick} disc population.
Klochkova Valentina G.
Panchuk Vladimir E.
Zacs Laimons
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