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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730228.0, MPI für Astronomie / Publikationen_mpia
New constraints on the multiplicity of massive young stars in Upper Scorpius
Authors:Grellmann, R.; Ratzka, T.; Köhler, R.; Preibisch, T.; Mucciarelli, P.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Astronomy and Astrophysics
Start Page:id. A84 (11 pp)
Audience:Not Specified
Abstract / Description:Context. Observations and simulations have clearly established that most stars form in multiple systems. Characterizing their properties is thus important for our understanding of the star formation process. <BR /> Aims: To provide statistics about the number of companions per star over the full range of angular distances, infrared long-baseline interferometric studies can be employed to fill the gap between spectroscopic and adaptive optics searches. The Upper Scorpius OB association is a good target for such observations, because its stellar content is very well known from both spectroscopic and adaptive optics searches. <BR /> Methods: We used the ESO Very Large Telescope Interferometer to perform long-baseline interferometric observations of a sample of seven B stars. Furthermore, we used ROSAT X-ray data to search for indications of low-mass companions. <BR /> Results: With the interferometric observations, we find previously known companions around σ Sco and HR 6027. For the other targets we determine the parameter space in which the presence of companions can be excluded from our data. For two of the B stars in our sample, π Sco and HR 6026, the detection of X-ray emission provides indirect evidence of previously unknown low-mass companions. <BR /> Conclusions: In total we find two previously unknown companions. We can exclude the presence of other unknown companions within the separation range of ~2 to ~100 mas and for a brightness ratio ≥0.1. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, observing program 085.C-0260.Appendix A is available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201219577/olm">http://www.aanda.org</A>
Free Keywords:techniques: interferometric; binaries: general; X-rays: stars; binaries : close; stars: formation; stars: massive
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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