Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538202c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #382.02; Bulletin of the American Astronomical Society, Vol. 42, p.593
Astronomy and Astrophysics
Astrophysics
Scientific paper
Our understanding of early stellar evolution is largely based upon theoretical models, requiring key empirical benchmarks for testing and calibration. Consequently, it is paramount to acquire accurate measurements of fundamental physical parameters of young stars, and to use these to assess the validity of early stellar evolution models with respect to mass and age. We have approached this endeavor on two different spatial and temporal scales:
First, we use eclipsing binary systems to measure the basic parameters of individual stars (masses, radii, temperatures, and luminosities), as well as providing important tests for the fundamental predictions of stellar evolution models. Here, we will present our work on Par 1802, a low-mass eclipsing binary system in the 1 Myr old Orion Nebula Cluster. Through extensive spectroscopic and photometric campaigns, we have determined Par 1802 to be composed of two 0.41 M&sun; stars, making it the first young, equal-mass eclipsing binary system identified. We find significant differences in the temperatures and luminosities of these two identical mass stars, allowing placement of empirical limits on evolutionary timescales of low-mass star formation.
On a larger scale, we exploit multi-wavelength observations of young open clusters to characterize the properties of large numbers of coeval, equidistant, and chemically homogeneous stars over a range of masses. We will discuss the details of our comprehensive study of the young, nearby, Southern open cluster Blanco 1, which is of particular astrophysical interest due to its high Galactic latitude (b=-79°) and its comparable age to the well-studied Pleiades cluster. Its unusual Galactic location makes it a highly attractive target for our extensive observing program due to low field star contamination. We will focus our discussion on the results from recent investigations into this cluster's X-ray emission and lithium abundance distributions.
Cargile Phillip
James Dionne
Stassun Keivan
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