SIMBAD references

2009AJ....137..118P - Astron. J., 137, 118-128 (2009/January-0)

High-resolution spectroscopic observations of four yellow-type symbiotic stars: CD-43°14304, Hen 3-1213, Hen 3-863, and StHα 176.


Abstract (from CDS):

We report on the analysis of high-resolution optical spectra of four symbiotic stars CD-43°14304, Hen 3-863, Hen 3-1213, and StHα176. The chemical composition of the atmospheres of the investigated stars shows that they are all metal-poor K giants with metallicities around [Fe/H] ~ -1.0. All stars show an enrichment of the elements created by slow neutron-capture reactions. The luminosities obtained for the symbiotic star CD-43°14304 and probably for Hen 3-1213 are below those of the asymptotic giant branch (AGB) stars that started helium-burning (via thermal pulses) and became self-enriched in the neutron-capture elements. Therefore, their abundance peculiarities are due to mass transfer from the previous thermally pulsing AGB star (now the white dwarf), overabundant in s-process elements. For the stars Hen 3-863 and StHα176, the uncertainties due to the distance (and interstellar absorption as well) prevent a reliable determination of the luminosity. The heavy-element abundance distribution of these four analyzed symbiotics is similar to that of the three symbiotics previously analyzed (AG Dra, BD-21°3873, and Hen 2-467). Finally, their general abundance pattern follows the halo standard abundance.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: evolution - stars: individual (CD-43 14304, Hen 3-863, Hen 3-1213, StHa 176)

CDS comments: In paragraph 4.1.1 CD-43 1430 is a misprint for CD-43 14304.

Simbad objects: 10

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