New Methods for Determining the Ages of PMS Stars

New Methods for Determining the Ages of PMS Stars

We present three new methods for determining the age of groups of pre-main-sequence stars. The first, creating empirical isochrones allows us to create a robust age ordering, but not to derive actual ages. The second, using the width of the gap in colour-magnitude space between the pre-main-sequence...

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Veröffentlicht in:arXiv.org 2009-09
Hauptverfasser: Naylor, Tim, Mayne, N J, Jeffries, R D, Littlefair, S P, Saunders, Eric S
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Sprache:eng
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Chronology
Physics - Instrumentation and Methods for Astrophysics
Physics - Solar and Stellar Astrophysics
Pre-main sequence stars
Stellar age
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Mayne, N J
Jeffries, R D
Littlefair, S P
Saunders, Eric S
description We present three new methods for determining the age of groups of pre-main-sequence stars. The first, creating empirical isochrones allows us to create a robust age ordering, but not to derive actual ages. The second, using the width of the gap in colour-magnitude space between the pre-main-sequence and main-sequence (the radiative convective gap) has promise as a distance and extinction independent measure of age, but is as yet uncalibrated. Finally we discuss tau-squared fitting of the main sequence as the stars approach the terminus of the main sequence. This method suggests that there is a factor two difference between these "nuclear" ages, and more conventional pre-main-sequence contraction ages.
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subjects Chronology
Physics - Instrumentation and Methods for Astrophysics
Physics - Solar and Stellar Astrophysics
Pre-main sequence stars
Stellar age
title New Methods for Determining the Ages of PMS Stars
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