The Gravities of K Giant Stars Determined from OI and OH Features

Details The Gravities of K Giant Stars Determined from OI and OH Features The Gravities of K Giant Stars Determined from OI and OH Features

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..319b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO.2/SEP15, P. 319, 1993

Astronomy and Astrophysics

Astronomy

19

Line: Formation - Stars: Abundances - Stars: Atmospheres - Stars: Fundamental Parameters - Stars: Giant

Scientific paper

The oxygen abundances of four K giant stars, including Arcturus, are deduced from [O I] and OH line data. The OH lines used are vibration-rotation lines of the Δυ=2 and Δυ=1 sequences. Surface gravities are then determined for the stars, adopting a temperature and overall abundance and then solving for the surface gravity by requiring the oxygen abundance derived from OH lines to match that derived from [O I] lines. In addition, an analysis of the Δυ=2 OH lines in the solar spectrum is carried out in order to obtain the solar oxygen abundance and thereby check the transition probabilities used. We find that more accurate values of the OH transition probabilities would offer another means of choosing which solar models better represent the Sun. The wavelengths of the Δυ=2 lines are located in a region in which the H- opacity is a minimum, suggesting that these lines are formed deep in the stellar (and solar) atmospheres, and are therefore less likely to be subject to non-LTE effects. They are also much weaker than the Δυ= 1 lines, and their equivalent widths are less dependent on microturbulent velocity. We also find that the microturbulent velocity is different for lines of the two sequences in α Tau, presumably because of the different depths of formation.

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