A sensitive 10-micron search for emission arising from circumstellar dust associated with solar-type pre-main-sequence stars

Details A sensitive 10-micron search for emission arising from circumstellar dust associated with solar-type pre-main-sequence stars A sensitive 10-micron search for emission arising from circumstellar dust associated with solar-type pre-main-sequence stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1187s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, April 1990, p. 1187-1195. Research supported by NASA and NSF.

Astronomy and Astrophysics

Astronomy

224

Cosmic Dust, Emission Spectra, Infrared Astronomy, Pre-Main Sequence Stars, Stellar Envelopes, H Alpha Line, Optical Thickness, Photosphere, Spectral Energy Distribution, Spectral Line Width, Stellar Evolution

Scientific paper

The presence and evolutionary timescales of circumstellar disks surrounding solar-type premain-sequence stars are studied using excess IR radiation above photospheric levels. The analysis is based on optical photometry, published near-IR fluxes, IRAS fluxes, and 10-micron flux measurements of 20 stars in Taurus-Auriga obtained with the NASA IR telescope facility. About half of the stars with ages less than 3 Myr show excess 2.2 and 10 micron emission, consistent with emission from optically thick disks extending inward to the stellar surface. At ages of about 10 Myr, less than 10 percent of the sample stars show evidence of dust emission from optically thick disks. It is concluded that the timescale over which disks survive as IR-luminous, optically thick structures is less than 10 Myr. Also, evidence for inner holes in premain-sequence stars surrounded by optically thick disks is discussed.

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