Additional constraints on circumstellar disks in the Trapezium Cluster

Details Additional constraints on circumstellar disks in the Trapezium Cluster Additional constraints on circumstellar disks in the Trapezium Cluster

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1375s&link_type=abstract

The Astronomical Journal, vol. 108, no. 4, p. 1375-1381

Astronomy and Astrophysics

Astronomy

33

Astronomical Photography, B Stars, Galactic Clusters, Infrared Astronomy, Infrared Spectra, O Stars, Pre-Main Sequence Stars, Stellar Envelopes, Stellar Evolution, Stellar Models, Stellar Spectra, Visible Spectrum, Astronomical Photometry, Astronomical Spectroscopy, Emission Spectra, Hubble Space Telescope, Image Processing, Infrared Spectroscopy, Spaceborne Astronomy, Stellar Mass

Scientific paper

We discuss the new constraints on the population of compact ionized sources in the Trapezium Cluster thought to arise from the ionization by the central OB stars of circumstellar disks around low-mass pre-main sequence stars. We present new Hubble Space Telescope (HST) Planetary Camera observations of two of these candidate disk sources, resolving extended nebulosity around them. One source shows a small-scale (greater than or approximately = 100 AU) bow-shock structure, previously seen on larger scales by O'Dell et al. We show that the circumstellar disk model is the most likely one for the majority of sources, although is remains plausible that some of the larger objects could be equilibrium globules. We combine the most complete censuses of compact radio sources and stars in the core region to derive the fraction of the stellar population that may be associated with a circumstellar disk. Our estimate of 25%-75% is comparable to that found for pre-main sequence (PMS) stars in the Taurus-Auriga dark clouds, indicating that the dense cluster environment of the Trapezium has not drastically reduced the frequency of disks seen around PMS stars.

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