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Title:
Pre-Main-Sequence A-type stars
Authors:
Marconi, Marcella; Palla, Francesco
Publication:
The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. Edited by J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss, IAU Symposium, No. 224. Cambridge, UK: Cambridge University Press, 2004., p.69-79
Publication Date:
12/2004
Origin:
CUP
Keywords:
Stars: evolution, stars: Pre-Main-Sequence, stars: oscillations (including pulsations), stars: variables: delta Scuti.
DOI:
10.1017/S1743921304004399
Bibliographic Code:
2004IAUS..224...69M

Abstract

Young A-type stars in the pre-main-sequence (PMS) evolutionary phase are particularly interesting objects since they cover the mass range (˜1.5-4 M&sun;) which is most sensitive to the internal conditions inherited from the protostellar phase. In particular, they undergo a process of thermal relaxation from which they emerge as fully radiative objects contracting towards the Main Sequence. A-type stars also show intense surface activity (including winds, accretion, pulsations) whose origin is still not completely understood, and infrared excesses related to the presence of circumstellar disks and envelopes. Disks display significant evolution in the dust properties, likely signalling the occurrence of protoplanetary growth. Finally, A-type stars are generally found in multiple systems and small aggregates with lower mass companions.

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