Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..164t&link_type=abstract
STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin
Other
Cepheids, Stellar Characteristics And Properties, Giant And Subgiant Stars
Scientific paper
We describe our study of long-term variability of o Ceti (Mira A), the prototype of the Mira-type pulsating stars. Our study was originally undertaken to search for coherent long-period variability, but the results of our analysis didn't uncover this. However, we detected a low-frequency ``red noise'' in the Fourier spectrum of the o Ceti century-long light curve. We have since found similar behavior in other Miras and pulsating giant stars and have begun a study of a large sample of Mira variables. Similar red noise has been previously detected in red supergiants and attributed to supergranular convection. Its presence in Miras suggests the phenomenon may be ubiquitous in cool giant pulsators. These results support high-angular resolution observations of Miras and supergiants showing asymmetries in their surface brightness distributions, which may be due to large supergranular convection cells. Theoretical modeling, and numerical simulations of pulsation processes in late-type giants and supergiants should therefore take into account the effects of deep convection and large supergranular structures, which in turn may provide important insights into the behavior of Miras and other giant and supergiant pulsators. In this work, we summarize our results for o Ceti, present preliminary results of our broader study of Mira variables, and discuss how the results of this study may be used by future studies of AGB variables.
Karovska Margarita
Templeton Matthew R.
No associations
LandOfFree
Long-Term Variability in o Ceti and Other Mira Variables: Signs of Supergranular Convection? 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 Long-Term Variability in o Ceti and Other Mira Variables: Signs of Supergranular Convection?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long-Term Variability in o Ceti and Other Mira Variables: Signs of Supergranular Convection? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1271665