Stauffer, John R. and Hartmann, Lee W. and Fazio, Giovanni G. and Allen, Lori E. and Patten, Brian M. and Lowrance, Patrick J. and Hurt, Robert L. and Rebull, Luisa M. and Cutri, Roc M. and Ramirez, Solange V. and Young, Erick T. and Rieke, George H. and Gorlova, Nadya I. and Muzerolle, James C. and Slesnick, Cathy L. and Skrutskie, Michael F. (2007) Near- and Mid-Infrared Photometry of the Pleiades and a New List of Substellar Candidate Members. Astrophysical Journal Supplement Series, 172 (2). pp. 663-685. ISSN 0067-0049 http://resolver.caltech.edu/CaltechAUTHORS:20100204-153206137
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We make use of new near- and mid-IR photometry of the Pleiades cluster in order to help identify proposed cluster members. We also use the new photometry with previously published photometry to define the single-star main-sequence locus at the age of the Pleiades in a variety of color-magnitude planes. The new near- and mid-IR photometry extend effectively 2 mag deeper than the 2MASS All-Sky Point Source catalog, and hence allow us to select a new set of candidate very low-mass and substellar mass members of the Pleiades in the central square degree of the cluster. We identify 42 new candidate members fainter than K_s = 14 (corresponding to 0.1 M_☉). These candidate members should eventually allow a better estimate of the cluster mass function to be made down to of order 0.04 M_☉. We also use new IRAC data, in particular the images obtained at 8 μm, in order to comment briefly on interstellar dust in and near the Pleiades. We confirm, as expected, that—with one exception—a sample of low-mass stars recently identified as having 24 μm excesses due to debris disks do not have significant excesses at IRAC wavelengths. However, evidence is also presented that several of the Pleiades high-mass stars are found to be impacting with local condensations of the molecular cloud that is passing through the Pleiades at the current epoch.
|Additional Information:||© 2007 American Astronomical Society. Print publication: Issue 2 (2007 October); received 2007 February 23; accepted for publication 2007 April 6. Most of the support for this work was provided by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. This research has made use of NASA’s Astrophysics Data System (ADS) Abstract Service, and of the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of data products from the Two Micron All-Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation. These data were served by the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The research described in this paper was partially carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of the SIMBAD database operated at CDS, Strasbourg, France, and also of the NED and NStED databases operated at IPAC, Pasadena, CA. A large amount of data for the Pleiades (and other open clusters) can also be found at the open cluster databaseWEBDA(http://www.univie.ac.at/webda/ ), operated in Vienna by Ernst Paunzen.|
|Subject Keywords:||open clusters and associations: individual (Pleiades); stars: low-mass, brown dwarfs|
|Official Citation:||Near- and Mid-Infrared Photometry of the Pleiades and a New List of Substellar Candidate Members John R. Stauffer, Lee W. Hartmann, Giovanni G. Fazio, Lori E. Allen, Brian M. Patten, Patrick J. Lowrance, Robert L. Hurt, Luisa M. Rebull, Roc M. Cutri, Solange V. Ramirez, Erick T. Young, George H. Rieke, Nadya I. Gorlova, James C. Muzerolle, Cathy L. Slesnick, and Michael F. Skrutskie 2007 ApJS 172 663-685 doi: 10.1086/518961|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||16 Feb 2010 19:20|
|Last Modified:||26 Dec 2012 11:44|
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