Kinematics and Evolution of Pre-Main Sequence Stars in Nearby Star-Forming Regions

• Grant number: 13/04934-8
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: June 01, 2013
• End date: May 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Positional Astronomy and Celestial Mechanics
• Principal Investigator: Ramachrisna Teixeira
• Grantee: Phillip Andreas Brenner Galli
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 11/51676-9 - LLAMA: a mm/submm radiotelescope in the Andes, in collaboration with Argentina, AP.TEM
• Associated scholarship(s): 15/14696-2 - Complementing Gaia from the ground with the dance survey in nearby star-forming regions, BE.EP.PD

Abstract

To reliably determine the main physical parameters (mass and age) of young stars we must know their distance. A precise determination of masses and ages is required to constrain the disk lifetime and can provide indications about the timescale of planet formation. While the average distance to nearby star-forming regions (< 200 pc) is often known, the distances to individual stars are usually unknown. Individual distances for members of co-moving groups of stars can be derived from their proper motions, radial velocities and the convergent point position of the moving group when the trigonometric parallax measured from the ground using optical telescopes is not accessible. However, a variant of the trigonometric parallax method using multi-epoch VLBI observations can also be successfully employed to measure very precise individual parallaxes. In this postdoctoral research project we propose to (i) investigate the kinematics and evolution of pre-main sequence stars in different star-forming regions and young associations within 200 pc, (ii) construct an online database for pre-main sequence and (iii) start a pilot study in radioastrometry dedicated to measure the distances of pre-main sequence stars.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ORTIZ-LEON, GISELA N.; LOINARD, LAURENT; DZIB, SERGIO A.; GALLI, PHILLIP A. B.; KOUNKEL, MARINA; MIODUSZEWSKI, AMY J.; RODRIGUEZ, LUIS F.; TORRES, ROSA M.; HARTMANN, LEE; BODEN, ANDREW F.; et al. The Gould's Belt Distances Survey (GOBELINS). V. Distances and Kinematics of the Perseus Molecular Cloud. ASTROPHYSICAL JOURNAL, v. 865, n. 1, SEP 20 2018. (13/04934-8, 15/14696-2)

GALLI, PHILLIP A. B.; LOINARD, LAURENT; ORTIZ-LEON, GISELA N.; KOUNKEL, MARINA; DZIB, SERGIO A.; MIODUSZEWSKI, AMY J.; RODRIGUEZ, LUIS F.; HARTMANN, LEE; TEIXEIRA, RAMACHRISNA; TORRES, ROSA M.; et al. The Gould's Belt Distances Survey (GOBELINS). IV. Distance, Depth, and Kinematics of the Taurus Star-forming Region. ASTROPHYSICAL JOURNAL, v. 859, n. 1, MAY 20 2018. (09/54006-4, 13/04934-8, 15/14696-2)

GALLI, PHILLIP A. B.; JONCOUR, ISABELLE; MORAUX, ESTELLE. Three-dimensional structure of the Upper Scorpius association with the Gaia first data release. Monthly Notices of the Royal Astronomical Society, v. 477, n. 1, p. L50-L54, JUN 2018. (13/04934-8, 15/14696-2)