The ultraviolet flux distribution of Alpha-2 Canum Venaticorum

Details The ultraviolet flux distribution of Alpha-2 Canum Venaticorum The ultraviolet flux distribution of Alpha-2 Canum Venaticorum

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...39..549l&link_type=abstract

Astrophysical Journal Supplement Series, vol. 39, Apr. 1979, p. 549-572.

Computer Science

Sound

17

A Stars, Magnetic Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, Abundance, Opacity, Rare Earth Elements, Rocket Sounding, Satellite Observation, Spectral Bands, Wavelengths

Scientific paper

Intermediate- and narrow-band UV spectrophotometry from Copernicus, OAO 2, the S2-68 experiment on TD 1, and a sounding-rocket experiment are combined with ground-based observations to define the absolute flux distribution of the bright magnetic Ap star Alpha-2 CVn over the wavelength range from 1030 to 7580 A. Two flux distributions are presented which coincide more or less with the rare-earth maximum and minimum in the star's cycle. The results are compared with those for two normal stars, the UV variability of Alpha-2 CVn is characterized as a function of wavelength, and non-LTE effects on the UV continua of C I and Si I are analyzed. Some physical properties of Alpha-2 CVn are estimated, and the evolutionary age of the star is estimated to be between 220 million and 300 million years. It is concluded that Alpha-2 CVn is old enough to have been magnetically braked to its current rotational velocity by either the centrifugal-wind or the accretion mechanism and to have developed its chemical peculiarities by either mechanism.

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