Journal of Astronomy and Space Sciences 제37권 3호 (p.157-163)

|Research Paper|
The Chemical Composition of V1719 Cyg: δ Scuti Type Star without the Accretion of Interstellar Matter

키워드 :
stars: individual (V1719 Cyg),stars: abundances,stars: circumstellar matter,stars: atmospheres,stars: Population I,physical data and processes: accretion

목차

1. INTRODUCTION
2. HISTORY OF V1719 CYG
3. THE USED SPECTRUM AND THE ABUNDANCEANALYSIS
4. DISCUSSION
REFERENCES

초록

High resolution spectroscopic observation of V1719 Cyg were made at 1.8 meter telescope of Bohyunsan Optical Astronomy observatory in Korea. Spectral resolving power was R=45,000, signal to noise ratio S/N>100. The abundances of 28 chemical elements from carbon to dysprosium were found with the spectrum synthesis method. The abundances of oxygen, titanium, vanadium and elements with Z>30 are overabundant by 0.2–0.9 dex with respect to the solar values. Correlations of derived abundances with condensation temperatures and second ionization potentials of these elements are discussed. The possible influence of accretion from interstellar environment is not so strong as for ρ Pup and other stars with similar temperatures. The signs of accretion are absent. The comparison of chemical composition with solar system r- & s-process abundance patterns shows the enhancement of the photosphere by s-process elements.