Structure and kinematics of the Taurus star-forming region from Gaia-DR2 and VLBI astrometry
Idioma
en
Article de revue
Este ítem está publicado en
Astronomy and Astrophysics - A&A. 2019, vol. 630, p. A137
EDP Sciences
Resumen en inglés
Aims:We take advantage of the second data release of the Gaia space mission and the state-of-the-art astrometry delivered from very long baseline interferometry observations to revisit the structure and kinematics of the ...Leer más >
Aims:We take advantage of the second data release of the Gaia space mission and the state-of-the-art astrometry delivered from very long baseline interferometry observations to revisit the structure and kinematics of the nearby Taurus star-forming region. Methods: We apply a hierarchical clustering algorithm for partitioning the stars in our sample into groups (i.e., clusters) that are associated with the various molecular clouds of the complex, and derive the distance and spatial velocity of individual stars and their corresponding molecular clouds. Results: We show that the molecular clouds are located at different distances and confirm the existence of important depth effects in this region reported in previous studies. For example, we find that the L 1495 molecular cloud is located at $d=129.9^{+0.4}_{-0.3}$ pc, while the filamentary structure connected to it (in the plane of the sky) is at $d=160.0^{+1.2}_{-1.2}$ pc. We report B 215 and L 1558 as the closest ($d=128.5^{+1.6}_{-1.6}$ pc) and most remote ($d=198.1^{+2.5}_{-2.5}$ pc) substructures of the complex, respectively. The median inter-cloud distance is 25 pc and the relative motion of the subgroups is on the order of a few km/s. We find no clear evidence for expansion (or contraction) of the Taurus complex, but signs of the potential effects of a global rotation. Finally, we compare the radial velocity of the stars with the velocity of the underlying $^{13}$CO molecular gas and report a mean difference of $0.04\pm0.12$ km/s (with r.m.s. of 0.63 km/s) confirming that the stars and the gas are tightly coupled.< Leer menos
Palabras clave en inglés
Astrophysics - Solar and Stellar Astrophysics
Astrophysics - Astrophysics of Galaxies
Proyecto ANR
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
FUTURE - ANR-16-IDEX-0003
FUTURE - ANR-16-IDEX-0003
Orígen
Importado de HalCentros de investigación