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New Low-Mass Stars and Brown Dwarfs with Disks in Lupus 1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Allen, Peter B. Luhman, K. L. Myers, Philip C. Megeath, S. Thomas Allen, Lori E. Hartmann, Lee Fazio, Giovanni G. |
| Copyright Year | 2007 |
| Abstract | Using the Infrared Array Camera and the Multiband Imaging Photometer aboard the Spitzer Space Telescope, we have obtained images of the Lupus 3 star-forming cloud at 3.6, 4.5, 5.8, 8.0, and 24 μm. We present photometry in these bands for the 41 previously known members that are within our images. In addition, we have identified 19 possible new members of the cloud based on red 3.6-8.0 μm colors that are indicative of circumstellar disks. We have performed optical spectroscopy on 6 of these candidates, all of which are confirmed as young low-mass members of Lupus 3. The spectral types of these new members range from M4.75 to M8, corresponding to masses of 0.2-0.03 M⊙ for ages of ∼ 1 Myr according to theoretical evolutionary models. We also present optical spectroscopy of a candidate disk-bearing object in the vicinity of the Lupus 1 cloud, 2M 1541-3345, which Jayawardhana & Ivanov recently classified as a young brown dwarf (M ∼ 0.03 M⊙) with a spectral type of M8. In contrast to their results, we measure an earlier spectral type of M5.75±0.25 for this object, indicating that it is probably a low-mass star (M ∼ 0.1 M⊙). In fact, according to its gravity-sensitive absorption lines and its luminosity, 2M 1541-3345 is older than members of the Lupus clouds (τ ∼ 1 Myr) and instead is probably a more evolved pre-main-sequence star that is not directly related to the current generation of star formation in Lupus. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. Support for this work was provided by NASA through contract 1256790 issued by JPL/Caltech. Support for the IRAC instrument was provided by NASA through contract 960541 issued by JPL. Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802; pallen@astro.psu.edu. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138. Department of Physics and Astronomy, The University of Toledo, 2801 West Bancroft St., Toledo, OH 43606. Department of Astronomy, The University of Michigan, 500 Church Street, 830 Dennison Building, Ann Arbor, Michigan 48109. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0702435v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Astronomy Bands Color DWARF Floppy disk GUCY2C protein, human Lupus Vulgaris Optical Spectroscopy Photometry Stars, Celestial Stellar classification United States National Aeronautics and Space Administration photometers |
| Content Type | Text |
| Resource Type | Article |
