2007ApJ...656..275M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET12:56:16

2007ApJ...656..275M - Astrophys. J., 656, 275-286 (2007/February-2)

Capture-formed binaries via encounters with massive protostars.

MOECKEL N. and BALLY J.

Abstract (from CDS):

Most massive stars are found in the center of dense clusters and have a companion fraction much higher than their lower mass siblings; the massive stars of the Trapezium core in Orion have ∼1.5 companions each. This high multiplicity could be a consequence of formation via a capture scenario, or it could be due to fragmentation of the cores that form the massive stars. During stellar formation circumstellar disks appear to be nearly ubiquitous. Their large radii compared to stellar sizes increase the interaction radius significantly, suggesting that disk interactions with neighboring stars could assist in capturing binary companions. This mechanism has been studied for stars of approximately solar mass and found to be inefficient. In this paper we present simulations of interactions between a 22 Mstar-disk system and less massive impactors in order to study the disk-assisted capture formation of binaries in a regime suited to massive stars. The formation of binaries by capture is found to be much more efficient for massive capturers. We discuss the effects of a mass-dependent velocity dispersion and mass segregation on the capture rates and consider the long-term survival of the resulting binaries in a dense cluster.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Stars: Formation

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2014 1
2 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1484 1
3 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 135 1
4 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 637 0
5 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 944 2
6 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 399 0
7 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 710 0
8 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 196 0
9 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 369 3
10 [WBN74] NGC 7538 IRS 2 Y*? 23 13 45.474 +61 28 19.87           ~ 71 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-12:56:16

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