Detection of an energetic flare from the M5V secondary star in the Polar MQ Dra
Wood Matt A; Hakala Pasi; Ramsay Gavin
Detection of an energetic flare from the M5V secondary star in the Polar MQ Dra
Wood Matt A
Hakala Pasi
Ramsay Gavin
OXFORD UNIV PRESS
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021093048871
https://urn.fi/URN:NBN:fi-fe2021093048871
Tiivistelmä
MQ Dra is a strongly magnetic Cataclysmic Variable whose white dwarf accretes material from its secondary star through a stellar wind at a low rate. TESS observations were made of MQ Dra in four sectors in Cycle 2 and show a short duration, high energy flare (similar to 10(35) erg) which has a profile characteristic of a flare from the M5V secondary star. This is one of the few occasions where an energetic flare has been seen from a Polar. We find no evidence that the flare caused a change in the light curve following the event and consider whether a coronal mass ejection was associated with the flare. We compare the frequency of energetic flares from the secondary star in MQ Dra with M dwarf stars and discuss the overall flare rate of stars with rotation periods shorter than 0.2 d and how such fast rotators can generate magnetic fields with low differential rotation rates.
Kokoelmat
- Rinnakkaistallenteet [19207]