On the potassium-rotation connection in late-type Alpha Persei stars

Details On the potassium-rotation connection in late-type Alpha Persei stars On the potassium-rotation connection in late-type Alpha Persei stars

2004-09-18

arxiv.org/abs/astro-ph/0409450v1

Astron.Astrophys. 429 (2005) 1051-1055

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20041629

We present measurements of the \ion{K}{i} $\lambda 7699$ line from spectra of 19 late-type members of the $\alpha$Persei cluster obtained with the Intermediate Dispersion Spectrograph at the Isaac Newton Telescope. These stars span a narrow range of $T_\mathrm{eff}$, from 5091 K to 4771 K, and a wide range of $v \sin i$ values (9 $\mathrm{km s}^{-1}$--170 $\mathrm{km s}^{-1}$). We find empirically that larger rotational broadening increases the equivalent width of \ion{K}{i} $\lambda 7699$ linearly for $v \sin i$ values from 15 $\mathrm{km s}^{-1}$ to 75 $\mathrm{km s}^{-1}$. This correlation breaks down for $v \sin i >$ 75 $\mathrm{km s}^{-1}$. After correction for this effect, we show that the potassium line equivalent widths do not correlate with $v \sin i$.}

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