Coronal modulation in the ultra-fast rotator LO Peg

TL;DR

This study uses X-ray observations to analyze the coronal structure of the ultra-fast rotator LO Peg, revealing non-uniform active regions and large coronal areas through rotational modulation modeling.

Contribution

First detailed coronal imaging of LO Peg showing non-uniform active regions and large coronal coverage using X-ray data and rotational modulation modeling.

Findings

Active regions concentrated around two longitudes.

Presence of a compact active region.

Large coronal area covering nearly 60 degrees in longitude.

Abstract

We present coronal imaging of the ultra-fast rotator, LO Peg, using the X-ray observations from XMM-Newton. The X-ray light curves show one strong flare at the end of observation, as reported in an earlier study. On removal of flaring events, the quiescent state light curve shows rotational modulations, which are modelled using a maximum likelihood model. The results obtained from modelling show the corona of LO Peg is not uniform. Active regions are concentrated around two longitudes, where one active region appears to be compact. The large coronal area that covers almost 60 degrees along longitude from the poles to the equator does not consist of active regions.