2008AJ....136.1557H -
Astron. J., 136, 1557-1565 (2008/October-0)
A spectroscopic and photometric study of the metal-poor, pulsating, post-asymptotic giant branch binary HD 46703.
HRIVNAK B.J., VAN WINCKEL H., REYNIERS M., BOHLENDER D., WAELKENS C. and LU W.
Abstract (from CDS):
The metal-poor post-asymptotic giant branch (AGB) star HD 46703 is shown to be a single-line spectroscopic binary with a period of 600 days, a high velocity of -94 km/s, and an orbital eccentricity of 0.3. Light-curve studies show that it also pulsates with a period of 29 days. High-resolution, high signal-to-noise spectra were used for a new abundance study. The atmospheric model determined is Teff= 6250 K, log g = 1.0, Vt= 3.0 km/s, and a metal abundance of [M/H] = -1.5. A low carbon abundance and a lack of s-process element enhancement indicate that the star has not experienced a third dredge-up on the AGB. The sulfur and zinc abundances are high compared with iron, and the chemical abundances show a clear anti-correlation with condensation temperature. The abundance depletion pattern is similar to that seen in other post-AGB binaries, and, like them, is attributed to the chemical fractionation of refractory elements onto dust stored in a circumbinary disk and the re-accretion of volatiles in the stellar atmosphere. The infrared excess is small but the excess energy distribution is very similar to what can be expected from a disk. HD 46703 joins the growing list of depleted, post-AGB stars which are likely surrounded by a dusty and stable circumbinary disk.
Abstract Copyright:
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Journal keyword(s):
binaries: spectroscopic - stars: abundances - stars: AGB and post-AGB - stars: chemically peculiar - stars: individual: HD 46703
VizieR on-line data:
<Available at CDS (J/AJ/136/1557): table1.dat table3.dat table4.dat table5.dat>
Simbad objects:
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