%0 Generic %1 defreitas2020insight %A de Freitas, D. B. %D 2020 %K age down spin %T A new insight on stellar age I. Theoretical trends with gyro-age and rotation %U http://arxiv.org/abs/2003.01444 %X 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.

@misc{defreitas2020insight, 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.}, added-at = {2020-03-06T22:56:54.000+0100}, author = {de Freitas, D. B.}, biburl = {https://www.bibsonomy.org/bibtex/2acbb9a5ff22d5f85cfb66d5848015a73/ericblackman}, description = {A new insight on stellar age I. Theoretical trends with gyro-age and rotation}, interhash = {49caf0ef38cf708fa15a1d835d3ae2c1}, intrahash = {acbb9a5ff22d5f85cfb66d5848015a73}, keywords = {age down spin}, note = {cite arxiv:2003.01444Comment: 5 pages and 1 figure. (Brainstorm)}, timestamp = {2020-03-06T22:56:54.000+0100}, title = {A new insight on stellar age I. Theoretical trends with gyro-age and rotation}, url = {http://arxiv.org/abs/2003.01444}, year = 2020 }