César Briceño et al. 2002 ApJ 580 317 doi:10.1086/343127
The Initial Mass Function in the Taurus Star-forming Region*
FREECésar Briceño1,5, K. L. Luhman2, Lee Hartmann2, John R. Stauffer3 and J. Davy Kirkpatrick4
Show affiliationsBy combining a deep optical imaging (I, z') survey of 8 deg2 in the Taurus star-forming region with data from the Two-Micron All-Sky Survey (2MASS) and follow-up spectroscopy, we have performed a search for low-mass Taurus members that is complete to 0.02 M
for reddenings of AV 
4. We report the discovery of nine new members with spectral types of M5.75-M9.5, corresponding to masses of 0.1-0.015 M by recent evolutionary models. The new M9.5 member is the least massive brown dwarf found to date in the Taurus star-forming region. We derive an initial mass function (IMF) for the fields surveyed in this work and in our previous studies, which encompass 54% of the known Taurus membership. We compare the Taurus IMF with a similarly derived one for the Trapezium Cluster and to mass functions for the M35 and Pleiades open clusters. While the IMFs in all of these regions flatten near ~0.8 M, the mass function in Taurus is more narrow and sharply peaked at this mass. Our survey indicates that Taurus has ~2 × fewer brown dwarfs at 0.02-0.08 M than the Trapezium. We discuss the implications of these results for theories of the IMF, and suggest that the lower frequency of brown dwarfs in Taurus relative to the Trapezium may result from the low-density star-forming environment, leading to larger minimum Jeans masses.
- Footnote
- Subject headings
infrared: stars; stars: evolution; stars: formation; stars: low-mass, brown dwarfs; stars: luminosity function, mass function; stars: pre-main sequence
- Dates
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Issue 1 (2002 November 20)
Received 2002 March 14, accepted for publication 2002 July 25
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The Initial Mass Function in the Taurus Star-forming Region
César Briceño et al. 2002 ApJ 580 317
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