Line-Profile Analysis of K{I} 7699 in the Sun and in Procyon

Details Line-Profile Analysis of K{I} 7699 in the Sun and in Procyon Line-Profile Analysis of K{I} 7699 in the Sun and in Procyon

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..511t&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.511-528.

Astronomy and Astrophysics

Astronomy

31

Line Formation, Line Profiles, Stars: Abundances, Stars: Individual (Procyon), Sun: Atmosphere

Scientific paper

The profiles of the resonance line of potassium (KI 7698.98) in the flux spectrum of the Sun and Procyon were studied in detail using the multi-parameter fitting method, in order to extract information regarding the fundamental atomic parameters responsible for the formation of this line as well as to diagnose the nature of the velocity fields in their atmospheres. It was concluded from an analysis of the solar KI 7699 profil e that neutral-hydrogen collisions are practically negligible compared to electron collisions in the rate equation of statistical equilibrium, and that an empirical correcti on to the Uns{o}ld's standard (van der Waals effect) damping constant is Delta log C6 =~ +1.0 with the most consistent microturbulent velocity of xi =~ 0.8 km s(-1) . Based upon these results, the atmospheric-velocity parameters of Procyon were determined to be xi =~ 1.4 km s(-1) , zeta_RT =~ 6.7 km s(-1) (the radial-tangential macroturbulence), and v_esin i =~ 3.3 km s(-1) (the projected rotational velocity). The potassium abundances of the Sun and Procyon derived from this resonance lin e, which are significantly affected by the non-LTE effect amounting to ~ 0.4 dex (Sun) and ~ 0.7 dex (Procyon), turned out to be nearly the same and log epsilon_K =~ 5.1. It also appears that the microturbulence tends to decrease with an increase in the atmospheric height of the Sun as well as of Procyon.

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