Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The masses of young stars: CN as a probe of dynamical masses   Aims: We attempt to determine the masses of single or multiple young T Tauri
and HAeBe stars from the rotation of their Keplerian disks. Methods:We used the
IRAM PdBI interferometer to perform arcsecond resolution images of the CN N=2-1
transition with good spectral resolution. Integrated spectra from the 30-m
radiotelescope show that CN is relatively unaffected by contamination from the
molecular clouds. Our sample includes 12 sources, among which isolated stars
like DM Tau and MWC 480 are used to demonstrate the method and its accuracy. We
derive the dynamical mass by fitting a disk model to the emission, a process
giving M/D the mass to distance ratio. We also compare the CN results with
higher resolution CO data, that are however affected by contamination. Results:
All disks are found in nearly perfect Keplerian rotation. We determine accurate
masses for 11 stars, in the mass range 0.5 to 1.9 solar masses. The remaining
one, DG Tau B, is a deeply embedded object for which CN emission partially
arises from the outflow. With previous determination, this leads to 14 (single)
stars with dynamical masses. Comparison with evolutionary tracks, in a distance
independent modified HR diagram, show good overall agreement (with one
exception, CW Tau), and indicate that measurement of effective temperatures are
the limiting factor. The lack of low mass stars in the sample does not allow to
distinguish between alternate tracks.

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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con