| PROPOSAL OVERVIEW | |
| Proposal Title | Exploring the juvenile behavior of 2.7-Gyr-old-stars in Ruprecht 147 |
| Proposal Category | Life-cycle of Stars and Planets |
| Proposal Type | LARGE PROGRAM |
| Proposal Id | 094283 |
| Number of Observations | 5 |
| Total exposure time (ks) | 440 |
| PI DETAILS | |
| PI | Dr. Marcel Agueros |
| Institute | Columbia Astrophysics Laboratory |
| Country | UNITED STATES |
| CO-INVESTIGATORS | ||
| Name | Country | |
| A. Nunez | UNITED STATES | |
| J. Curtis | UNITED STATES | |
| ABSTRACT | |
| Knowing the ages of low-mass stars is key to constraining the habitability of their planets. FGKM stars spin down due to loss of angular momentum via magnetized winds, and rotation-period and magnetic-activity measurements are windows into what should be the most reliable clocks in these stars. However, observations of open clusters, whose known ages make them ideal testbeds for the age-rotation-activity relation (ARAR), show some single >1 Gyr old stars not behaving their age, with rotation remaining unexpectedly rapid. X-rays are the most direct way of testing explanations for this stalling in spin-down. We propose to turn Ruprecht 147, at 300 pc the closest old cluster, into a new benchmark for the ARAR, by measuring coronal activity at 2.7 Gyr, when K and M stars are acting half their age. | |
| PAPERS |
| - CLASS 1: | papers that present specific XMM-Newton observations |
| - CLASS 2: | papers that refer to published XMM-Newton results with complementary observations, follow-up analysis, or theoretical analysis |
| - CLASS 3: | further deliveries which resulted from the program and which are made available to the community (e.g. source catalogues, processed images or spectra in public data base) |
| - CLASS 4: | comments and suggestions from PI |