Skip to main content Accessibility help
×
Home

Binary Stars in the Orion Nebula Cluster

  • Rainer Köhler (a1), Monika G. Petr-Gotzens (a2), Mark J. McCaughrean (a3), Jerome Bouvier (a4), Gaspard Duchêne (a4), Andreas Quirrenbach (a5) and Hans Zinnecker (a6)...

Abstract

We report on a high-spatial-resolution survey for binary stars in the periphery of the Orion Nebula Cluster, at 5–15 arcmin (0.65 – 2 pc) from the cluster center. We observed 228 stars with adaptive optics systems, in order to find companions at separations of 0.13 – 1.12 arcsec (60 – 500 AU), and detected 13 new binaries. Combined with the results of Petr (1998), we have a sample of 275 objects, about half of which have masses from the literature and high probabilities to be cluster members. We used an improved method to derive the completeness limits of the observations, which takes into account the elongated point spread function of stars at relatively large distances from the adaptive optics guide star. The multiplicity of stars with masses >2 M is found to be significantly larger than that of low-mass stars. The companion star frequency of low-mass stars is comparable to that of main-sequence M-dwarfs, less than half that of solar-type main-sequence stars, and 3.5 to 5 times lower than in the Taurus-Auriga and Scorpius-Centaurus star-forming regions. We find the binary frequency of low-mass stars in the periphery of the cluster to be the same or only slightly higher than for stars in the cluster core (< 3′ from θ1C Ori). This is in contrast to the prediction of the theory that the low binary frequency in the cluster is caused by the disruption of binaries due to dynamical interactions. There are two ways out of this dilemma: Either the initial binary frequency in the Orion Nebula Cluster was lower than in Taurus-Auriga, or the Orion Nebula Cluster was originally much denser and dynamically more active. A detailed report of this work has been published in Astronomy & Astrophysics (Köhler et al. 2006).

    • 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.

      Binary Stars in the Orion Nebula Cluster
      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.

      Binary Stars in the Orion Nebula Cluster
      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.

      Binary Stars in the Orion Nebula Cluster
      Available formats
      ×

Copyright

References

Hide All
Duchêne, G. 1999, A&A 341, 547
Durisen, R.H. & Sterzik, M.F. 1994, A&A 286, 84
Ghez, A.M., Neugebauer, G., & Matthews, K. 1993, AJ 106, 2005
Ghez, A.M., McCarthy, D.W., Patience, J. & Beck, T. 1997, AJ 481, 378
Köhler, R., Petr-Gotzens, M.G., McCaughrean, M.J., Bouvier, J., Duchêne, G., Quirrenbach, A. & Zinnecker, H. 2006, A&A 458, 461
Kroupa, P. 1995, MNRAS 277, 1491
Kroupa, P., Petr, M., & McCaughrean, M. 1999, New Astronomy 4, 495
Leinert, Ch., Zinnecker, H., Weitzel, N. et al. , 1993, A&A 278, 129
McCaughrean, M.J. 2001, in: The Formation of Binary Stars, proceedings of IAU Symp. No. 200, eds. Zinnecker, H. and Mathieu, R.D., ASP Conference Series, p. 169
Padgett, D.L., Strom, S.E., & Ghez, A. 1997, ApJ 477, 705
Petr, M.G., Coudé du Foresto, V., Beckwith, S.V.W., Richichi, A., & McCaughrean, M.J. 1998, ApJ 500, 825
Petr, M.G. 1998, PhD Thesis, University of Heidelberg
Prosser, C.F., Stauffer, J.R., Hartmann, L. et al. , 1994, ApJ 421, 517
Scally, A., Clarke, C., & McCaughrean, M.J. 1999, MNRAS 306, 253
Simon, M., Close, L.M., & Beck, T.L. 1999, AJ 117, 1375
Sterzik, M.F., Durisen, R.H., & Zinnecker, H. 2003, A&A 411, 91
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

Type Description Title
PDF
Full Posters

koehler
Symposium poster

 PDF (337 KB)
337 KB

Binary Stars in the Orion Nebula Cluster

  • Rainer Köhler (a1), Monika G. Petr-Gotzens (a2), Mark J. McCaughrean (a3), Jerome Bouvier (a4), Gaspard Duchêne (a4), Andreas Quirrenbach (a5) and Hans Zinnecker (a6)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed