VEGA - Data analysis of the observations

Details VEGA - Data analysis of the observations VEGA - Data analysis of the observations

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.174..181m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 174, no. 2, Dec. 1990, p. 181-193.

Astronomy and Astrophysics

Astrophysics

A Stars, B Stars, Stellar Spectrophotometry, Atmospheric Temperature, Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Atmospheres, Stellar Envelopes, Stellar Spectra

Scientific paper

In view of the generally accepted notion that Vega is a standard star of A0 spectrum class and of V luminance class, a data analysis of Vega observations was carried out to verify the correspondence between the observed characteristics of Vega and the characteristics of a standard A0V star. The results of data analysis indicate that Vega is a star with B9.5IV-V characteristics with Te = 10,105 + or - 230 K and R = 2.69 + or - 0.25 solar radius, immersed in a nebula stretched along the equatorial plane. The gas and dust cover of Vega deform the energy distribution in Vega spectrum. As a result, energy flow with a distribution corresponding to an A0V star is imitated in the direction toward the observer. The results also suggest that Vega has already left the Main Sequence and is now in an unstable state of subsequent evolution.

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