Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-23T11:45:10.808Z Has data issue: false hasContentIssue false

The dependence of maximum starspot amplitude and the amplitude distribution on stellar properties

Published online by Cambridge University Press:  26 August 2011

Steven H. Saar
Affiliation:
Smithsonian Astrophysical Obs., 60 Garden Street, Cambridge, MA 02138, USA email: [email protected], [email protected]
Michelle Dyke
Affiliation:
Smithsonian Astrophysical Obs., 60 Garden Street, Cambridge, MA 02138, USA email: [email protected], [email protected] Yale Univ. New Haven, CTUSA
Søren Meibom
Affiliation:
Smithsonian Astrophysical Obs., 60 Garden Street, Cambridge, MA 02138, USA email: [email protected], [email protected]
Sydney A. Barnes
Affiliation:
Lowell Obs., 1400 W. Mars Hill Road, Flagstaff, AZ 86011 email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

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

We combine photometric data from field stars, plus over a dozen open clusters and associations, to explore how the maximum photometric amplitude (Amax) and the distribution of amplitudes varies with stellar properties. We find a complex variation of Amax with inverse Rossby number Ro−1, which nevertheless can be modeled well with a simple model including an increase in Amax with rotation for low Ro−1, and a maximum level. Amax may then be further affected by differential rotation and a decline at the highest Ro−1. The distribution of Aspot below Amax varies with Ro−1 : it peaks at low Aspot with a long tail towards Amax for low Ro−1, but is more uniformly distributed at higher Ro−1. We investigate further dependences of the Aspot distributions on stellar properties, and speculate on the source of these variations.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

Allain, S., Bouvier, J., Prosser, C., Marschall, L. A., & Laaksonen, B. D. 1996, Astron. Astrophys, 305, 498Google Scholar
Barnes, S. A. & Kim, Y.-C. 2010, Astrophys. J., 721, 675CrossRefGoogle Scholar
Barnes, S. A. 2003, Astrophys. J., 586, 464CrossRefGoogle Scholar
Barnes, S. A., Sofia, S., Prosser, C. F., & Stauffer, J. R. 1999, Astrophys. J., 516, 263CrossRefGoogle Scholar
Collier Cameron, A., et al. 2009, Mon. Not. Roy. Astron. Soc., 400, 451CrossRefGoogle Scholar
Gunn, A. G., Mitrou, C. K., & Doyle, J. G. 1998, Mon. Not. Roy. Astron. Soc., 296, 150Google Scholar
Hartman, J. D., et al. 2009, Astrophys. J., 691, 342CrossRefGoogle Scholar
Meibom, S., Mathieu, R. D., & Stassun, K. G. 2009, Astrophys. J., 695, 679CrossRefGoogle Scholar
Messina, S., Desidera, S., Turatto, M., Lanzafame, A. C., & Guinan, E. F. 2010, arXiv:1004.1959Google Scholar
Messina, S., Parihar, P., Koo, J.-R., Kim, S.-L., Rey, S.-C., & Lee, C.-U. 2010, Astron. Astrophys, 513, A29CrossRefGoogle Scholar
Messina, S., Rodonò, M., & Guinan, E. F. 2001, Astron. Astrophys, 366, 215CrossRefGoogle Scholar
O'Neal, D., Saar, S. H., & Neff, J. E. 1996, Astrophys. J., 463, 766CrossRefGoogle Scholar
Patten, B. M. & Simon, T. 1996, Astrophys. J. Suppl., 106, 489CrossRefGoogle Scholar
Randich, S. 1998, 10th Cool Stars, Stellar Systems, and the Sun, ASP Conf. Ser., 154, 501Google Scholar
Saar, S. H. 2009, Astronomical Society of the Pacific Conference Series, ASP Conf. Ser. 416, 375Google Scholar
Saar, S. H., Peterchev, A., O'Neal, D., & Neff, J. E. 2001, 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conf. Ser., 223, 1057Google Scholar
Schüssler, M. & Solanki, S. K. 1992, Astron. Astrophys, 264, L13Google Scholar
Strassmeier, K. G. 2009, A&A Rev., 17, 251Google Scholar