Abundances of lithium, sodium, and potassium in Vega

Abstract

Vega's photospheric abundances of Li, Na, and K were determined by using considerably weak lines measured on the very high-S/N spectrum, while the non-LTE correction and the gravity-darkening correction were adequately taken into account. It was confirmed that these alkali elements are mildly underabundant ([Li/H] ~ -0.6, [Na/H] ~ -0.3, and [K/H] ~ -0.2) compared to the solar system values, as generally seen also in other metals. Since the tendency of Li being more deficient than Na and K is qualitatively similar to what is seen in typical interstellar cloud, the process of interstellar gas accretion may be related with the abundance anomaly of Vega, as suspected in the case of lambda Boo stars.

arXiv commentAccepted for publication in MNRAS; 8 pages, 9 figures

References in corpus (6)

• Vega is a rapidly rotating star
• First Results from the CHARA Array VII: Long-Baseline Interferometric Measurements of Vega Consistent with a Pole-On, Rapidly Rotating Star
• Non-LTE Analysis for the Sodium Abundances of Metal-Poor Stars in the Galactic Disk and Halo
• On the Abundance of Potassium in Metal-Poor Stars
• The status of Galactic field lambda Bootis stars in the post-Hipparcos era
• The lambda Bootis phenomenon: interaction between a star and a diffuse interstellar cloud

Cited by in corpus (6)

• The chemical abundance analysis of normal early A- and late B-type stars
• Abundances in the Herbig Ae star HD 101412: Abundance anomalies; Lambda Boo-Vega characteristics?
• Lithium, Sodium, and Potassium Abundances in Sharp-Lined A-Type Stars
• Can Sodium Abundances of A-Type Stars Be Reliably Determined from Na I 5890/5896 Lines?
• Abundance analysis of the supergiant stars HD 80057 and HD 80404 based on their UVES Spectra
• Detailed photospheric abundances of 28 Peg and HD 202240