Solar like oscillations in the stars KIC 5390438 and KIC 5701829 observed by Kepler

TL;DR

This study identifies two red giant stars, KIC 5390438 and KIC 5701829, exhibiting solar-like oscillations through Kepler data analysis, providing insights into their pulsation characteristics and stellar classifications.

Contribution

First detection of solar-like oscillations in KIC 5390438 and KIC 5701829 using Kepler short-cadence data and Fourier analysis, with spectroscopic classification confirming their giant status.

Findings

Detected excess power in 100-350 μHz range indicating solar-like oscillations

Estimated large and small frequency separations for the stars

Spectroscopic classification as K2III and K0III giants

Abstract

The preliminary results of an analysis of the KIC 5390438 and KIC 5701829 light curves are presented. The variations of these stars were detected by Baran et al. (2011a) in a search for pulsating M dwarfs in the Kepler public database. The objects have been observed by the Kepler spacecraft during the Q2 and Q3 runs in a short-candence mode (integration time of $\sim$ 1 min). A Fourier analysis of the time series data has been performed by using the PERIOD04 package. The resulting power spectrum of each star shows a clear excess of power in the frequency range 100 and 350 $\mu$Hz with a sequence of spaced peaks typical of solar-like oscillations. A rough estimation of the large and small separations has been obtained. Spectroscopic observations secured at the Observatorio Astronomico Nacional in San Pedro M\'artir allowed us to derive a spectral classification K2III and K0III for KIC 5390438 and KIC 5701829, respectively. Thus, KIC 5390438 and KIC 5701829 have been identified as solar-like oscillating red giant stars.