2MASS J15460752-6258042: a mid-M dwarf hosting a prolonged accretion disc
Monthly Notices of the Royal Astronomical Society(2020)
摘要
We report the discovery of the oldest (∼55 Myr) mid-M type star known to host ongoing accretion. 2MASS J15460752–6258042 (2M1546, spectral type M5, 59.2 pc) shows spectroscopic signs of accretion such as strong H α, He i, and [O i] emission lines, from which we estimate an accretion rate of ∼10−10 M⊙ yr−1. Considering the clearly detected infrared excess in all WISE bands, the shape of its spectra...
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关键词
accretion, accretion discs,stars: late-type,stars: pre-main-sequence,open clusters and associations: individual
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