The Taurus Spitzer Survey: New Candidate Taurus Members Selected Using Sensitive Mid-Infrared Photometry

February 2010 • 2010ApJS..186..259R

Authors • Rebull, L. M. • Padgett, D. L. • McCabe, C. -E. • Hillenbrand, L. A. • Stapelfeldt, K. R. • Noriega-Crespo, A. • Carey, S. J. • Brooke, T. • Huard, T. • Terebey, S. • Audard, M. • Monin, J. -L. • Fukagawa, M. • G├╝del, M. • Knapp, G. R. • Menard, F. • Allen, L. E. • Angione, J. R. • Baldovin-Saavedra, C. • Bouvier, J. • Briggs, K. • Dougados, C. • Evans, N. J. • Flagey, N. • Guieu, S. • Grosso, N. • Glauser, A. M. • Harvey, P. • Hines, D. • Latter, W. B. • Skinner, S. L. • Strom, S. • Tromp, J. • Wolf, S.

Abstract • We report on the properties of pre-main-sequence objects in the Taurus molecular clouds as observed in seven mid- and far-infrared bands with the Spitzer Space Telescope. There are 215 previously identified members of the Taurus star-forming region in our ~44 deg2 map these members exhibit a range of Spitzer colors that we take to define young stars still surrounded by circumstellar dust (noting that ~20% of the bona fide Taurus members exhibit no detectable dust excesses). We looked for new objects in the survey field with similar Spitzer properties, aided by extensive optical, X-ray, and ultraviolet imaging, and found 148 new candidate members of Taurus. We have obtained follow-up spectroscopy for about half the candidate sample, thus far confirming 34 new members, three probable new members, and 10 possible new members, an increase of 15%-20% in Taurus members. Of the objects for which we have spectroscopy, seven are now confirmed extragalactic objects, and one is a background Be star. The remaining 93 candidate objects await additional analysis and/or data to be confirmed or rejected as Taurus members. Most of the new members are Class II M stars and are located along the same cloud filaments as the previously identified Taurus members. Among non-members with Spitzer colors similar to young, dusty stars are evolved Be stars, planetary nebulae, carbon stars, galaxies, and active galactic nuclei.


IPAC Authors

Sean Carey

Senior Scientist


Luisa Rebull

Senior Research Scientist