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Spitzer-mips Observations of the Chamaeleontis Young Association
| Content Provider | Semantic Scholar |
|---|---|
| Author | Gautier, Thomas. N. Rebull, Luisa M. Stapelfeldt, Karl R. Mainzer, Amy K. |
| Copyright Year | 2008 |
| Abstract | We have mapped the Chamaeleontis young stellar association in the far-infrared with the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. All 16 members within the map region were detected at 24 m, along with five members at 70 m and two at 160 m. Ten stars show far-infrared excess emission indicating the presence of circumstellar disks; six of these have central clearings as evidenced by the onset of excess emission at k > 5 m. No new infrared-excess sources are identified among the 113 2MASS field stars with 24 m photometry but not seen as X-ray sources, indicating that membership lists derived from X-ray surveys are reasonably complete. Circumstellar disks in the Cha association span the range from 10 1 to 10 4 in their fractional infrared luminosity, with a median Ld /L of 0.04. The presence of optically thick, optically thin, and intermediate optical depth disks within the same stellar group, in combination with the large fraction of disks with inner holes, indicates that the Cha association represents a crucial stage in circumstellar disk evolution. Subject headinggs: circumstellar matter — infrared: stars — open clusters and associations: individual ( Chamaeleontis) — planetary systems — stars: preYmain-sequence |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://authors.library.caltech.edu/13783/1/GAUapj08.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | 2MASS Floppy disk Hydra Engine Hydra Polyps Mahdiyar Mental association Meteorological reanalysis Offset binary Onset (audio) Photometry Planetary scanner Span Distance Stars, Celestial Stellar (payment network) TCFL5 gene United States National Aeronautics and Space Administration photometers |
| Content Type | Text |
| Resource Type | Article |
