The age rank of the nearest pre-main-sequence groups

Details The age rank of the nearest pre-main-sequence groups The age rank of the nearest pre-main-sequence groups

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.400l..29l&link_type=abstract

Monthly Notices of the Royal Astronomical Society: Letters, Volume 400, Issue 1, pp. L29-L33.

Astronomy and Astrophysics

Astronomy

4

Techniques: Spectroscopic, Stars: Evolution, Stars: Formation, Stars: Fundamental Parameters, Stars: Pre-Main-Sequence, Open Clusters And Associations: General

Scientific paper

We address the age rank of the nearest pre-main-sequence (PMS) associations, using low-resolution spectrophotometry to measure gravity-sensitive indices in these stars. We compare spectral index-colour sequences for the PMS populations and rank them according to the strength of their gravity-sensitive features. The age rank using the gravity method is in general agreement with the ranking of these groups suggested by colour-magnitude (CM) diagram placement. Several of the groups have a kinematic origin in the Oph-Sco-Cen OB association. For three of them, their age rank is also in agreement with epochs resulting from a formation scenario for the OB association.

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