# New $\beta$ Cep pulsators discovered with K2 space photometry

## TL;DR

This paper reports the discovery of new $eta$ Cephei pulsators using K2 space photometry, providing detailed frequency analyses and potential for future asteroseismic modeling of massive stars.

## Contribution

It introduces three new $eta$ Cep pulsators and characterizes their pulsation frequencies and patterns, expanding the known sample for asteroseismic studies.

## Key findings

- Discovered three new $eta$ Cep pulsators with high-frequency pulsations.
- Identified regular frequency spacing in one pulsator, HD 169173.
- Provided detailed pulsation frequency lists for multiple stars.

## Abstract

We present the discovery of three new $\beta$ Cep pulsators, three new pulsators with frequency groupings, and frequency patterns in a B3Ib star, all of which show pulsations with frequencies as high as about 17 d$^{-1}$, with K2 space mission photometry. Based on a Fourier analysis and iterative pre-whitening we present a classification and evaluate the potential for asteroseismic modelling. We include the lists of pulsation frequencies for three new $\beta$ Cep pulsators, CD-28 12286, CD-27 10876, LS 3978, and additional pulsation mode frequencies for the known $\beta$ Cep pulsator HD 164741. In addition we characterise the regular frequency spacing found in the new pulsator HD 169173, and discuss its origin. We place the newly discovered variables in a colour-magnitude diagram using parallaxes from Gaia-DR2, showcasing their approximate location in the massive star domain. The identified frequency lists of these multiperiodic pulsators are a good starting point for future forward seismic modelling, after identification of at least one pulsation frequency from high-resolution time series spectroscopy and/or multi-colour photometry.