Making the CHARA Array, Part I: founding CHARA, the audacity of hope

Beyond the Audacity of Hope: The Promise of an Educated Citizenry

Policy Futures in Education ◽

10.2304/pfie.2009.7.2.271 ◽

2009 ◽

Vol 7 (2) ◽

pp. 271-274

Author(s):

Henry A. Giroux

Keyword(s):

Audacity Of Hope

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VEGA: Visible spEctroGraph and polArimeter for the CHARA array: principle and performance

Astronomy and Astrophysics ◽

10.1051/0004-6361/200913016 ◽

2009 ◽

Vol 508 (2) ◽

pp. 1073-1083 ◽

Cited By ~ 103

Author(s):

D. Mourard ◽

J. M. Clausse ◽

A. Marcotto ◽

K. Perraut ◽

I. Tallon-Bosc ◽

...

Keyword(s):

Chara Array ◽

And Performance

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PTPS Candidate Exoplanet Host Star Radii Determination with CHARA Array

Proceedings of the International Astronomical Union ◽

10.1017/s1743921311027360 ◽

2011 ◽

Vol 7 (S282) ◽

pp. 203-204

Author(s):

Paweł Zieliński ◽

Martin Vaňko ◽

Ellyn Baines ◽

Andrzej Niedzielski ◽

Aleksander Wolszczan

Keyword(s):

Effective Temperature ◽

Critical Parameter ◽

Spectroscopic Analysis ◽

Evolutionary Model ◽

Stellar Mass ◽

Surface Temperatures ◽

Penn State ◽

Chara Array ◽

Model Dependency

AbstractWe propose to measure the radii of the Penn State - Toruń Planet Search (PTPS) exoplanet host star candidates using the CHARA Array. Stellar radii estimated from spectroscopic analysis are usually inaccurate due to indirect nature of the method and strong evolutionary model dependency. Also, the so-called degeneracy of stellar evolutionary tracks due to convergence of many tracks in the giant branch decreases the precision of such estimates. However, the radius of a star is a critical parameter for the calculation of stellar luminosity and mass, which are often not well known especially for giants. With well determined effective temperature (from spectroscopy) and radius, the luminosity may be calculated precisely. In turn also stellar mass may be estimated much more precisely. Therefore, direct radii measurements increase precision in the determination of planetary candidates masses and the surface temperatures of the planets.

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