New Results on Long Secondary Periods in Red Giants

Details New Results on Long Secondary Periods in Red Giants New Results on Long Secondary Periods in Red Giants

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..122n&link_type=abstract

STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin

Computer Science

Giant And Subgiant Stars, Variable And Peculiar Stars, Binary And Multiple Stars

Scientific paper

Approximately 30% of variable red giants have light curves which show a Long Secondary Period (LSP) in addition to their primary oscillation. No model has been proposed that can satisfactorily explain the LSPs. Here we present velocity curves obtained from VLT spectra for a large sample of LMC red giants exhibiting LSPs. We use the velocity data in addition to both MACHO and OGLE light curves to examine the properties of the stars, and to evaluate models for the cause of LSPs. Extant models generally involve either binarity or pulsation. We show that both of these have severe problems explaining the light and velocity variations. However, new mid-infrared observations of stars with LSPs indicate the presence of a significant amount of circumstellar dust, most likely in a disk-like configuration. This observation favours the presence of a binary companion.

Affiliated with

Also associated with

No associations

Rating

New Results on Long Secondary Periods in Red Giants does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with New Results on Long Secondary Periods in Red Giants, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Results on Long Secondary Periods in Red Giants will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1271626