Why variable AGB stars with Long Secondary Periods aren't binaries, but are dusty

Details Why variable AGB stars with Long Secondary Periods aren't binaries, but are dusty Why variable AGB stars with Long Secondary Periods aren't binaries, but are dusty

2012-01-05

arxiv.org/abs/1201.1046v1

2011ASPC..445..167N

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages. ASP conference proceedings, from the conference: 'Why Galaxies Care About AGB Stars II', held in Vienna 16-20 August

Scientific paper

Roughly 30% of variable AGB stars show a Long Secondary Period, or LSP. These LSPs have posed something of a problem in recent years and their cause remains a mystery. By combining VLT-derived velocity curves with MACHO and OGLE light curves we were able to examine many properties of these stars and test the theory that LSPs are caused by binarity. We show why we concluded that the binary model for LSPs is unlikely. Examining mid-infrared SAGE observations for stars with LSPs shows that these stars are surrounded by a significant amount of cool dust in a nonspherical distribution, e.g. a disk or clumps. The unlikeliness of binarity in these stars forces us to conclude that the dust is not in a disk. We are left without an acceptable explanation for Long Secondary Periods in AGB stars.

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