Discovery of a very cool object with extraordinarily strong H(alpha) emission

Details Discovery of a very cool object with extraordinarily strong H(alpha) emission Discovery of a very cool object with extraordinarily strong H(alpha) emission

2002-08-28

arxiv.org/abs/astro-ph/0208497v1

Astron.Astrophys. 393 (2002) L85-L88

Astronomy and Astrophysics

Astrophysics

Astronomy and Astrophysics Letters, accepted

Scientific paper

10.1051/0004-6361:20021251

We report on the finding of the strongest H(alpha) emission -pseudoequivalent width of 705 Angstrom- known so far in a young, late type dwarf. This object, named as SOri71, is a substellar candidate member of the 1-8 Myr star cluster sigma Orionis. Due to its overluminous location in color-magnitude diagrams, SOri71 might be younger than other cluster members, or a binary of similar components. Its mass is in the range 0.021-0.012 M(sun), depending on evolutionary models and possible binarity. The broad H(alpha) line of SOri71 appears asymmetric, indicative of high velocity mass motions in the H(alpha) forming region. The origin of this emission is unclear at the present time. We discuss three possible scenarios: accretion from a disk, mass exchange between the components of a binary system, and emission from a chromosphere.

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