HD 114839 - An Am star showing both delta Scuti and gamma Dor pulsations discovered through MOST photometry

TL;DR

This paper reports the discovery of HD 114839, a hybrid pulsating Am star exhibiting both delta Scuti and gamma Dor oscillations, identified through nearly continuous MOST satellite photometry over 10 days.

Contribution

It is the fourth known hybrid pulsator of its kind, demonstrating the capability of space-based photometry to detect complex stellar oscillations.

Findings

HD 114839 shows hybrid p- and g-mode pulsations.

Frequencies identified near 2, 8, and 20 cycles/day.

First continuous 10-day observation revealing hybrid pulsations.

Abstract

Using MOST (Microvariability and Oscillations of STars) satellite guide star photometry, we have discovered a metallic A star showing hybrid p- and g-mode pulsations. HD 114839 was observed nearly continuously for 10 days in March, 2005. We identify frequencies in three groups: the first centered near 2 cycles/day, in the gamma Dor pulsation range, and two others near 8 and 20, both in the delta Scuti range. This is only the fourth known such hybrid pulsator, including another MOST discovery (Rowe et al. 2006, this issue).