Skip to main content Accessibility help
×
Home
Hostname: page-component-65d66dc8c9-5vmdn Total loading time: 0.228 Render date: 2021-09-28T19:04:03.678Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Barium Stars: Theoretical Interpretation

Published online by Cambridge University Press:  05 March 2013

Laura Husti*
Affiliation:
Dipartimento di Fisica Generale, Università degli Studi di Torino, via P. Giuria 1, 10125 Torino, Italia Research Centre for Atomic Physics and Astrophysics, University of Bucharest, P.O. Box MG-6, RO-077125 Bucharest-Magurele, Romania
Roberto Gallino
Affiliation:
Dipartimento di Fisica Generale, Università degli Studi di Torino, via P. Giuria 1, 10125 Torino, Italia
Sara Bisterzo
Affiliation:
Dipartimento di Fisica Generale, Università degli Studi di Torino, via P. Giuria 1, 10125 Torino, Italia
Oscar Straniero
Affiliation:
INAF Osservatorio Astronomico di Collurania, via M. Maggini, 64100 Teramo, Italy
Sergio Cristallo
Affiliation:
INAF Osservatorio Astronomico di Collurania, via M. Maggini, 64100 Teramo, Italy
*
D Corresponding author. Email: lotesileanu@yahoo.com
Rights & Permissions[Opens in a new window]

Abstract

HTML view is not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Barium stars are extrinsic Asymptotic Giant Branch (AGB) stars. They present the s-enhancement characteristic for AGB and post-AGB stars, but are in an earlier evolutionary stage (main sequence dwarfs, subgiants, red giants). They are believed to form in binary systems, where a more massive companion evolved faster, produced the s-elements during its AGB phase, polluted the present barium star through stellar winds and became a white dwarf. The samples of barium stars of Allen & Barbuy (2006) and of Smiljanic et al. (2007) are analysed here. Spectra of both samples were obtained at high-resolution and high S/N. We compare these observations with AGB nucleosynthesis models using different initial masses and a spread of 13C-pocket efficiencies. Once a consistent solution is found for the whole elemental distribution of abundances, a proper dilution factor is applied. This dilution is explained by the fact that the s-rich material transferred from the AGB to the nowadays observed stars is mixed with the envelope of the accretor. We also analyse the mass transfer process, and obtain the wind velocity for giants and subgiants with known orbital period. We find evidence that thermohaline mixing is acting inside main sequence dwarfs and we present a method for estimating its depth.

Type
Theory, Evolution and Models
Copyright
Copyright © Astronomical Society of Australia 2009

References

Allen, D. M. & Barbuy, B., 2006, A&A, 454, 895 Google ScholarPubMed
Arlandini, C., Käppeler, F., Wisshak, K., Gallino, R., Lugaro, M., Busso, M. & Straniero, O., 1999, ApJ, 525, 886 CrossRefGoogle Scholar
Bidelman, W. P. & Keenan, P. C., 1951, ApJ, 114, 473 CrossRefGoogle Scholar
Boffin, H. M. J. & Jorissen, A., 1988, A&A, 205, 155 Google Scholar
Busso, M., Lambert, D. L., Beglio, L., Gallino, R., Raiteri, C. M. & Smith, V. V., 1995, ApJ, 446, 775 CrossRefGoogle Scholar
Busso, M., Gallino, R. & Wasserburg, G. J., 1999, ARAA, 37, 239 CrossRefGoogle Scholar
Busso, M., Gallino, R., Lambert, D. L., Travaglio, C. & Smith, V.V., 2001, ApJ, 557, 802 CrossRefGoogle Scholar
Chieffi, A. & Straniero, O., 1989, ApJS, 71, 47 CrossRefGoogle Scholar
Gallino, R. et al., 1998, ApJ, 497, 388 CrossRefGoogle Scholar
Husti, L., 2008, PhD Thesis, Turin University Google Scholar
Husti, L. & Gallino, R., 2008, AIPC, 1001, 139 Google Scholar
Husti, L., Gallino, R. & Straniero, O., 2008, AIPC, 990, 161 Google Scholar
Knapp, R., 1985, ApJ, 293, 273 CrossRefGoogle Scholar
Izzard, R. G. & Glebbeek, E., 2006, NewA, 12, 161 CrossRefGoogle Scholar
Lodders, K., 2003, ApJ, 591, 1220 CrossRefGoogle Scholar
Jorissen, A. & Mayor, M., 1988, A&A, 198, 187 Google Scholar
Pottasch, S. R., 1984, ASSL, 107 Google Scholar
Pourbaix, D. & Jorissen, A., 2000, A&AS, 145, 161 Google Scholar
Reimers, D., 1977, A&A, 61, 217 Google ScholarPubMed
Smiljanic, R., Porto de Mello, G. F. & da Silva, L., 2007, A&A, 468, 679 Google Scholar
Stancliffe, R. J., Glebbeek, E., Izzard, R. G. & Pols, O. R., 2007, A&A, 464, 57 Google Scholar
Straniero, O. et al., 1995, ApJ, 440, 85 CrossRefGoogle Scholar
Straniero, O., Domínguez, I., Cristallo, S. & Gallino, R., 2003, PASA, 20, 389 CrossRefGoogle Scholar
Udry, S. et al., 1998a, A&AS, 131, 25 Google Scholar
Udry, S. et al., 1998b, A&AS, 131, 43 Google Scholar
You have Access
21
Cited by

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Barium Stars: Theoretical Interpretation
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Barium Stars: Theoretical Interpretation
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Barium Stars: Theoretical Interpretation
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *