Karl, Martina, Pfuhl, Oliver, Eisenhauer, Frank, Genzel, Reinhard, Grellmann, Rebekka, Habibi, Maryam, Abuter, Roberto, Accardo, Matteo, Amorim, Antonio ORCID: 0000-0003-0638-2321, Anugu, Narsireddy ORCID: 0000-0002-2208-6541, Avila, Gerardo, Benisty, Myriam, Berger, Jean-Philippe, Blind, Nicolas, Bonnet, Henri, Bourget, Pierre, Brandner, Wolfgang, Brast, Roland, Buron, Alexander, Garatti, Alessio Caratti O., Chapron, Frederic, Clenet, Yann, Collin, Claude, du Foresto, Vincent Coude, de Wit, Willem-Jan, de Zeeuw, Tim, Deen, Casey, Delplancke-Stroebele, Francoise, Dembet, Roderick, Derie, Frederic, Dexter, Jason ORCID: 0000-0003-3903-0373, Duvert, Gilles, Ebert, Monica, Eckart, Andreas, Esselborn, Michael, Fedou, Pierre, Finger, Gert, Garcia, Paulo, Dabo, Cesar Enrique Garcia, Lopez, Rebeca Garcia, Gao, Feng, Gendron, Eric, Gillessen, Stefan, Gonte, Frederic, Gordo, Paulo ORCID: 0000-0001-6861-8446, Groezinger, Ulrich, Guajardo, Patricia, Guieu, Sylvain, Haguenauer, Pierre, Hans, Oliver, Haubois, Xavier, Haug, Marcus ORCID: 0000-0002-7227-5914, Haussmann, Frank, Henning, Thomas, Hippler, Stefan ORCID: 0000-0002-3912-6108, Horrobin, Matthew, Huber, Armin, Hubert, Zoltan, Hubin, Norbert, Jakob, Gerd, Jochum, Lieselotte, Jocou, Laurent, Kaufer, Andreas, Kellner, Stefan, Kendrew, Sarah, Kern, Lothar, Kervella, Pierre ORCID: 0000-0003-0626-1749, Kiekebusch, Mario, Klein, Ralf, Koehler, Rainer, Kolb, Johan, Kulas, Martin, Lacour, Sylvestre ORCID: 0000-0002-6948-0263, Lapeyrere, Vincent, Lazareff, Bernard, Le Bouquin, Jean-Baptiste, Lena, Pierre, Lenzen, Rainer, Leveque, Samuel, Lin, Chien-Cheng ORCID: 0000-0002-7272-5129, Lippa, Magdalena, Magnard, Yves, Mehrgan, Leander, Merand, Antoine ORCID: 0000-0003-2125-0183, Moulin, Thibaut, Mueller, Eric, Mueller, Friedrich, Neumann, Udo, Oberti, Sylvain, Ott, Thomas, Pallanca, Laurent, Panduro, Johana, Pasquini, Luca, Paumard, Thibaut, Percheron, Isabelle, Perraut, Karine, Perrin, Guy, Pflueger, Andreas, Plewa, Philipp M., Popovic, Dan, Rabien, Sebastian, Ramirez, Andres, Ramos, Jose, Rau, Christian, Riquelme, Miguel, Rodriguez-Coira, Gustavo ORCID: 0000-0002-4177-6433, Rohloff, Ralf-Rainer, Rosales, Alejandra, Rousset, Gerard, Sanchez-Bermudez, Joel, Scheithauer, Silvia, Schoeller, Markus, Schuhler, Nicolas, Spyromilio, Jason, Straub, Odele, Straubmeier, Christian, Sturm, Eckhard, Suarez, Marcos, Tristram, Konrad R. W., Ventura, Noel, Vincent, Frederic, Waisberg, Idel, Wank, Imke, Widmann, Felix, Wieprecht, Ekkehard, Wiest, Michael, Wiezorrek, Erich, Wittkowski, Markus ORCID: 0000-0002-7952-9550, Woillez, Julien, Wolff, Burkhard, Yazici, Senol, Ziegler, Denis and Zins, Gerard (2018). Multiple star systems in the Orion nebula. Astron. Astrophys., 620. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

This work presents an interferometric study of the massive-binary fraction in the Orion Trapezium cluster with the recently comissioned GRAVITY instrument. We observed a total of 16 stars of mainly OB spectral type. We find three previously unknown companions for theta(1) Ori B, theta(2) Ori B, and theta(2) Ori C. We determined a separation for the previously suspected companion of NU Ori. We confirm four companions for theta(1) Ori A, theta(1) Ori C, theta(1) Ori D, and theta(2) Ori A, all with substantially improved astrometry and photometric mass estimates. We refined the orbit of the eccentric high-mass binary theta(1) Ori C and we are able to derive a new orbit for theta(1) Ori D. We find a system mass of 21.7 M-circle dot and a period of 53 days. Together with other previously detected companions seen in spectroscopy or direct imaging, eleven of the 16 high-mass stars are multiple systems. We obtain a total number of 22 companions with separations up to 600 AU. The companion fraction of the early B and O stars in our sample is about two, significantly higher than in earlier studies of mostly OB associations. The separation distribution hints toward a bimodality. Such a bimodality has been previously found in A stars, but rarely in OB binaries, which up to this point have been assumed to be mostly compact with a tail of wider companions. We also do not find a substantial population of equal-mass binaries. The observed distribution of mass ratios declines steeply with mass, and like the direct star counts, indicates that our companions follow a standard power law initial mass function. Again, this is in contrast to earlier findings of flat mass ratio distributions in OB associations. We excluded collision as a dominant formation mechanism but find no clear preference for core accretion or competitive accretion.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Karl, MartinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pfuhl, OliverUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eisenhauer, FrankUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Genzel, ReinhardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grellmann, RebekkaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Habibi, MaryamUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Abuter, RobertoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Accardo, MatteoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Amorim, AntonioUNSPECIFIEDorcid.org/0000-0003-0638-2321UNSPECIFIED
Anugu, NarsireddyUNSPECIFIEDorcid.org/0000-0002-2208-6541UNSPECIFIED
Avila, GerardoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benisty, MyriamUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Berger, Jean-PhilippeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blind, NicolasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonnet, HenriUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bourget, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brandner, WolfgangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brast, RolandUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buron, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garatti, Alessio Caratti O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chapron, FredericUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Clenet, YannUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Collin, ClaudeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
du Foresto, Vincent CoudeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Wit, Willem-JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Zeeuw, TimUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deen, CaseyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Delplancke-Stroebele, FrancoiseUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dembet, RoderickUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Derie, FredericUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dexter, JasonUNSPECIFIEDorcid.org/0000-0003-3903-0373UNSPECIFIED
Duvert, GillesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ebert, MonicaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eckart, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esselborn, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fedou, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Finger, GertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia, PauloUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dabo, Cesar Enrique GarciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lopez, Rebeca GarciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gao, FengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gendron, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gillessen, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gonte, FredericUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gordo, PauloUNSPECIFIEDorcid.org/0000-0001-6861-8446UNSPECIFIED
Groezinger, UlrichUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guajardo, PatriciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guieu, SylvainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haguenauer, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hans, OliverUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haubois, XavierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haug, MarcusUNSPECIFIEDorcid.org/0000-0002-7227-5914UNSPECIFIED
Haussmann, FrankUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hippler, StefanUNSPECIFIEDorcid.org/0000-0002-3912-6108UNSPECIFIED
Horrobin, MatthewUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huber, ArminUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hubert, ZoltanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hubin, NorbertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jakob, GerdUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jochum, LieselotteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jocou, LaurentUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kaufer, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kellner, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kendrew, SarahUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kern, LotharUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kervella, PierreUNSPECIFIEDorcid.org/0000-0003-0626-1749UNSPECIFIED
Kiekebusch, MarioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klein, RalfUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koehler, RainerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kolb, JohanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kulas, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lacour, SylvestreUNSPECIFIEDorcid.org/0000-0002-6948-0263UNSPECIFIED
Lapeyrere, VincentUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lazareff, BernardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Le Bouquin, Jean-BaptisteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lena, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lenzen, RainerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leveque, SamuelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lin, Chien-ChengUNSPECIFIEDorcid.org/0000-0002-7272-5129UNSPECIFIED
Lippa, MagdalenaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magnard, YvesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mehrgan, LeanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Merand, AntoineUNSPECIFIEDorcid.org/0000-0003-2125-0183UNSPECIFIED
Moulin, ThibautUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, FriedrichUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neumann, UdoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oberti, SylvainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ott, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pallanca, LaurentUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Panduro, JohanaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pasquini, LucaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paumard, ThibautUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Percheron, IsabelleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perraut, KarineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perrin, GuyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pflueger, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plewa, Philipp M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Popovic, DanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rabien, SebastianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ramirez, AndresUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ramos, JoseUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rau, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Riquelme, MiguelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rodriguez-Coira, GustavoUNSPECIFIEDorcid.org/0000-0002-4177-6433UNSPECIFIED
Rohloff, Ralf-RainerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rosales, AlejandraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rousset, GerardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Bermudez, JoelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scheithauer, SilviaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schoeller, MarkusUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schuhler, NicolasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Spyromilio, JasonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Straub, OdeleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Straubmeier, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sturm, EckhardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suarez, MarcosUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tristram, Konrad R. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ventura, NoelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vincent, FredericUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waisberg, IdelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wank, ImkeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Widmann, FelixUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wieprecht, EkkehardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiest, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiezorrek, ErichUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wittkowski, MarkusUNSPECIFIEDorcid.org/0000-0002-7952-9550UNSPECIFIED
Woillez, JulienUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wolff, BurkhardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yazici, SenolUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ziegler, DenisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zins, GerardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-162337
DOI: 10.1051/0004-6361/201833575
Journal or Publication Title: Astron. Astrophys.
Volume: 620
Date: 2018
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MASSIVE STARS; TRAPEZIUM CLUSTER; SPECTROSCOPIC BINARIES; SPECKLE INTERFEROMETRY; COMPETITIVE ACCRETION; STELLAR PARAMETERS; RADIAL-VELOCITY; ORBITAL MOTION; MAGNETIC-FIELD; WINDMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/16233

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