{
  "id": "2003.01444",
  "version": "v1",
  "published": "2020-03-03T10:55:32.000Z",
  "updated": "2020-03-03T10:55:32.000Z",
  "title": "A new insight on stellar age I. Theoretical trends with gyro-age and rotation",
  "authors": [
    "D. B. de Freitas"
  ],
  "comment": "5 pages and 1 figure. (Brainstorm)",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "In this first work attempts to analytically explain the effects on the magnetic braking index, $q$, caused by the evolution of stellar velocity in main-sequence stars, and estimated by de Freitas \\& De Medeiros (2013). We have found that the effect of $q$ is here a determining factor for understanding the delicate mechanisms that control the spin-down of stars as a function of the mass of stars. We note that our models predict that the calculated ages are distinct from gyrochronology ages. Indeed, the gyro-ages are measured considering only the canonical value of the Skumanich relation ($q$=3). As a result, we find that the age of stars can be well-determined when $q$ is free parameter. We also verified that for rotation periods less than $\\sim$ 5 days (i.e., fast rotators) there is a strong discrepancy among the different indexes $q$. In addition, the ages measured by gyrochronology model can be underestimated according to mass range selected. In conclusion, we suggest that the generalized gyro-ages by magnetic braking index can be an interesting way to better understand the idea of rotation as a clock.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-03-03T10:55:32.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stellar age",
      "theoretical trends",
      "magnetic braking index",
      "first work attempts",
      "mass range"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}