Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43....1h&link_type=abstract
New Astronomy Reviews, Volume 43, Issue 1, p. 1-29.
Astronomy and Astrophysics
Astronomy
12
Scientific paper
There is a well-developed, observationally-tested paradigm for accretion flows around young low-mass stars, consisting of infall to a rotating circumstellar disk, followed by accretion through the disk onto the central star. This basic picture may apply to higher-mass stars as well, but this has not been convincingly demonstrated yet, largely due to observational limitations. While it is clear that at least some intermediate-mass (2-5 Msolar) stars have dusty circumstellar disks, progress has been limited by small sample sizes and by difficulties in assigning ages to these stars. The origin of the excess infrared emission is not clear in many IM stars; either disks or envelopes, or both, may contribute. It is also not clear whether the model for T Tauri stars, in which disk material accretes onto the star along a stellar magnetosphere, also applies to some pre-main sequence intermediate mass stars. Further studies are needed to understand whether the strong winds of some young intermediate mass stars are driven by accretion energy release.
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