|Manu||Date: Wednesday, 06-January-2021, 10:07 AM | Message # 1|
|Superflare detected on an ultracool star|
by Tomasz Nowakowski , Phys.org
WAC 181229A detected by GWAC. All these images were obtained by GWAC at the same night, and all the observation times are marked. Credit: Xin et al., 2020.
Using Xinglong observatory's Ground-based Wide Angle Cameras (GWAC), astronomers from China and France have detected a new superflare of an ultracool star known as SDSS J013333.08+003223.7. The newly found event, designated GWAC 181229A, appears to be one of the most powerful ﬂares on ultracool stars so far discovered. The finding is reported in a paper published December 28 on arXiv.org.
Ultracool dwarfs (UCDs) are stellar or sub-stellar objects of spectral class M with effective temperatures below 2,700 K and masses not exceeding 0.3 solar masses. In general, they have weak chromospheric emission and are dim in X-rays, however, they sometimes exhibit flaring activity in various wavelengths.
Read more/full article/source - https://phys.org/news/2021-01-superflare-ultracool-star.html