研究目的
To find solar twins by analyzing stellar spectra closely resembling the spectrum of the Sun using a purely differential method.
研究成果
HIP 076114 (HD 138573) is identified as the best solar twin candidate, looking exactly like the Sun in all properties. The study demonstrates the ELODIE archive's value for comprehensive studies of solar-type stars and identifies 19 solar twins that closely resemble the Sun in atmospheric parameters and abundances.
研究不足
The study is limited by the quality and quantity of the spectra available in the ELODIE archive. The selection of spectra with a S/N at 550 nm greater than 70 and the rejection of spectra showing an enlarged CCF with FWHM greater than 12 km s?1 or a double-peaked CCF may exclude potential solar twins.
1：Experimental Design and Method Selection:
A purely differential method was applied directly on the fluxes to select stellar spectra resembling the Sun's spectrum.
2：Sample Selection and Data Sources:
A large dataset of ～2800 spectra extracted from the ELODIE archive was analyzed.
3：List of Experimental Equipment and Materials:
18 spectra of asteroids, Moon, and blue sky were used as solar reference.
4：Experimental Procedures and Operational Workflow:
Atmospheric parameters and differential abundances of eight chemical elements were determined for the solar twin candidates after a careful selection of appropriate lines. The Li feature of the targets was investigated.
5：Data Analysis Methods:
The degree of similarity between two spectra was measured using the TGMET code, a purely differential method implementing a minimum distance criterion.
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