| PROPOSAL OVERVIEW | |
| Proposal Title | Stellar spin-down: does the magnetic dynamo have an expiration date? |
| Proposal Category | Life-cycle of Stars and Planets |
| Proposal Type | LARGE PROGRAM |
| Proposal Id | 092110 |
| Number of Observations | 6 |
| Total exposure time (ks) | 420 |
| PI DETAILS | |
| PI | Prof. Katja Poppenhaeger |
| Institute | Leibniz-Institut für Astrophysik Potsdam (AIP) |
| Country | GERMANY |
| CO-INVESTIGATORS | ||
| Name | Country | |
| E. Amazo-Gomez | GERMANY | |
| J. Alvarado Gomez | GERMANY | |
| A. Warmuth | GERMANY | |
| N. Ilic | GERMANY | |
| ABSTRACT | |
| Recent years have seen great controversy about the rotational state of solar-mass stars older than the Sun. After excluding observational biases, evidence solidifies that the stars expected to rotate slower than the Sun are nowhere to be found, leading to theories that such stars may have a mostly switched-off dynamo and continue to coast with practically constant rotation periods into their future. However, age-rotation studies can only detect a dearth of stars rotating slower than our Sun, not the reason behind it. In contrast, X-ray observations can probe the state of the magnetic dynamo and reveal whether a switch-off really occurs. We therefore propose deep X-ray observations of a small, decisive sample of old sunlike stars to find out the reason behind the missing slow rotators. | |
| 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 |