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

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115407· OSTI ID:6770632

Skrutskie, M F; Dutkevitch, D; Strom, S E; Edwards, S; Strom, K M ^[1]

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1. Massachusetts Univ., Amherst (USA)

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. 18 refs.

• OSTI ID: 6770632
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 99; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGE ESTIMATION
ATMOSPHERES
BALMER LINES
COSMIC DUST
DUSTS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY SPECTRA
INFRARED RADIATION
LINE WIDTHS
MAIN SEQUENCE STARS
MORPHOLOGY
PHOTOMETRY
PROTOSTARS
RADIATIONS
SPECTRA
STAR EVOLUTION
STARS
STELLAR ATMOSPHERES