The connection between pulsation, mass loss and circumstellar shells in classical Cepheids

Hilding Neilson, Chow Choong Ngeow, Shashi Kanbur, John B. Lester

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Recent observations of Cepheids using infrared interferometry and Spitzer photometry have detected the presence of circumstellar envelopes (CSE) of dust and it has been hypothesized that the CSE's are due to dust forming in a Cepheid wind. Here we use a modified Castor, Abbott & Klein formalism to produce a Cepheid wind, and this is used to estimate the contribution of mass loss to the Cepheid mass discrepancy Furthermore, we test the OGLE-III Classical Cepheids using the IR fluxes from the SAGE survey to determine if Large Magellanic Cloud Cepheids have CSE's. It is found that IR excess is a common phenomenon for LMC Cepheids and that the resulting mass-loss rates can explain at least a fraction of the Cepheid mass discrepancy, depending on the assumed dust-to-gas ratio in the wind.

Original languageEnglish
Title of host publicationStellar Pulsation
Subtitle of host publicationChallenges for Theory and Observation - Proceedings of the International Conference
Pages141-145
Number of pages5
DOIs
StatePublished - 2009
EventInternational Conference on Stellar Pulsation: Challenges for Theory and Observation - Santa Fe, NM, United States
Duration: 31 May 20095 Jun 2009

Publication series

NameAIP Conference Proceedings
Volume1170
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on Stellar Pulsation: Challenges for Theory and Observation
Country/TerritoryUnited States
CitySanta Fe, NM
Period31/05/095/06/09

Keywords

  • Cepheids
  • Circumstellar Matter
  • Stars: Mass Loss

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