Studying the Kinematics of the Stellar Association TW Hya from Current Data
| Autor: | Bobylev, Vadim V., Bajkova, Anisa T. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Astrophysical Bulletin, 2024, Vol. 79, No. 3, pp. 473-480 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1134/S1990341324600443 |
| Popis: | The kinematics of the young stellar association near the Sun TW Hya is studied. Kinematic estimates of the age of this association were obtained in two ways. The first method -- analysis of stellar trajectories integrated back in time -- gave an estimate of the age $t=4.9\pm1.2$ Myr. The second was to analyze the instantaneous velocities of stars and showed that there is a volume expansion of the stellar system with an angular velocity coefficient $K_{xyz}=103\pm12$ km s$^{-1}$ kpc$^{-1}$. Based on this effect, the time interval that passed from the beginning of the expansion of the TW Hya association to the present moment was found, $t=9.5\pm1.1$ Myr. The following principal semi-axes of the residual velocity ellipsoid are determined: $\sigma_{1,2,3}=(5.25,1.84,0.35)\pm(0.34,0.63,0.26)$ km s$^{-1}$. Comment: 10 pages, 3 figures, the secular equation (10) was missed |
| Databáze: | arXiv |
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