# The Discovery of Stellar Oscillations in the K Giant $ι$ Dra - Astrophysics

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Abstract: $\iota$ Dra HIP 75458 is a well-known example for a K giant hosting asubstellar companion since its discovery by Frink et al. 2002. We presentradial velocity measurements of this star from observations taken with threedifferent instruments spanning nearly 8 years. They show more clearly that theRV period is long-lived and coherent thus supporting the companion hypothesis.The longer time baseline now allows for a more accurate determination of theorbit with a revised period of P=511 d and an additional small linear trend,indicative of another companion in a wide orbit. Moreover we show that the starexhibits low amplitude, solar like oscillations with frequencies around 3-4d$^{-1}$ 34.7-46.3 $\mu$Hz.

Autor: Mathias Zechmeister 1 and 2, Sabine Reffert 3, Artie P. Hatzes 2, Michael Endl 4, Andreas Quirrenbach 3 1 MPIA, Heidelberg, Germa

Fuente: https://arxiv.org/