Ambiguities of parametrized dust disk models for young stellar objects

Details Ambiguities of parametrized dust disk models for young stellar objects Ambiguities of parametrized dust disk models for young stellar objects

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..493t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 2, p. 493-502

Astronomy and Astrophysics

Astrophysics

41

Accretion Disks, Fitting, Parameterization, Pre-Main Sequence Stars, Stellar Envelopes, Stellar Models, Algorithms, Minima, Radii, Spectral Energy Distribution, Stellar Mass, Stellar Temperature

Scientific paper

We present a detailed study of the parameter space of circumstellar dust disk models for young stellar objects. Fitting the observed spectral energy distributions of FU Ori and DN Tau the problem of finding the best chi2-fit in a topologically complicated multidimensional parameter space is solved using a special Metropolis algorithm. The proposed automated fitting method is of simple structure, stable, and of general use for all kinds of fitting problems. Comparing the resulting disk parameters with earlier estimates we discuss methods used in recent papers to deduce constraints directly from the fit. In all cases we find a global ambiguity in acceptable fits. The only constraints we find for FU Ori are a temperature index limit of q less than 0.7, beta greater than 1 for the opacity index, and a total disk mass of 1/10 solar mass with an order of magnitude variation. For the spectrum of DN Tauri we find acceptable fits with inner radii ri less than 1.6 AU, q less than 0.65, and density indices p less than 1.6. This qualifies some of the previously found constraints, since the used methods did not sufficiently cover the entire parameter space.

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