SIMBAD references

2015ApJ...803...17Z - Astrophys. J., 803, 17 (2015/April-2)

The evolved pulsating CEMP star HD 112869.

ZACS L., SPERAUSKAS J., GRANKINA A., DEVEIKIS V., KAMINSKYI B., PAVLENKO Y. and MUSAEV F.A.

Abstract (from CDS):

Radial velocity measurements, BVRCphotometry, and high-resolution spectroscopy in the wavelength region from blue to near-infrared are employed in order to clarify the evolutionary status of the carbon-enhanced metal-poor star HD 112869 with a unique ratio of carbon isotopes in the atmosphere. An LTE abundance analysis was carried out using the method of spectral synthesis and new self-consistent 1D atmospheric models. The radial velocity monitoring confirmed semiregular variations with a peak-to-peak amplitude of about 10 km/s and a dominating period of about 115 days. The light, color, and radial velocity variations are typical of the evolved pulsating stars. The atmosphere of HD 112869 appears to be less metal-poor than reported before, [Fe/H] = -2.3±0.2 dex. Carbon-to-oxygen and carbon isotope ratios are found to be extremely high, C/O ~= 12.6 and12C/13C ≳ 1500, respectively. The s-process elements yttrium and barium are not enhanced, but neodymium appears to be overabundant. The magnesium abundance seems to be lower than the average found for CEMP stars, [Mg/Fe] < +0.4 dex. HD 112869 could be a single low-mass halo star in the stage of asymptotic giant branch evolution.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: carbon - stars: individual: TT CVn - stars: oscillations

Simbad objects: 15

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2021.03.07-19:54:59

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