2019A&A...623L...5K


Query : 2019A&A...623L...5K

2019A&A...623L...5K - Astronomy and Astrophysics, volume 623, L5-5 (2019/3-1)

Resolving the MYSO binaries PDS 27 and PDS 37 with VLTI/PIONIER.

KOUMPIA E., ABABAKR K.M., DE WIT W.J., OUDMAIJER R.D., CARATTI O GARATTI A., BOLEY P., LINZ H., KRAUS S., VINK J.S. and LE BOUQUIN J.-B.

Abstract (from CDS):


Context. Binarity and multiplicity appear to be a common outcome in star formation. In particular, the binary fraction of massive (OB-type) stars can be very high. In many cases, the further stellar evolution of these stars is affected by binary interactions at some stage during their lifetime. The origin of this high binarity and the binary parameters are poorly understood because observational constraints are scarce, which is predominantly due to a dearth of known young massive binary systems.
Aims. We aim to identify and describe massive young binary systems in order to fill in the gaps of our knowledge of primordial binarity of massive stars, which is crucial for our understanding of massive star formation.
Methods. We observed the two massive young stellar objects (MYSOs) PDS 27 and PDS 37 at the highest spatial resolution provided by VLTI/PIONIER in the H-band (1.3 mas). We applied geometrical models to fit the observed squared visibilities and closure phases. In addition, we performed a radial velocity analysis using published VLT/FORS2 spectropolarimetric and VLT/X-shooter spectroscopic observations.
Results. Our findings suggest binary companions for both objects at 12 mas (30au) for PDS 27 and at 22-28 mas (42-54au) for PDS 37. This means that they are among the closest MYSO binaries resolved to date.
Conclusions. Our data spatially resolve PDS 27 and PDS 37 for the first time, revealing two of the closest and most massive (>8M) YSO binary candidates to date. PDS 27 and PDS 37 are rare but great laboratories to quantitatively inform and test the theories on formation of such systems.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: formation - binaries: close - techniques: interferometric - stars: individual: PDS 27 - stars: individual: PDS 37 - stars: pre-main sequence

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 SS 103 Ae* 07 19 35.9395695288 -17 39 17.935943004 14.61 15.016 13.582 13.080   B2?e 56 0
2 BD-17 1959 PM* 07 24 34.2541592088 -17 53 31.989108552 12.962 11.712 10.315 9.444 8.646 M0V: 28 0
3 IRAS 08131-4432 Y*O 08 14 46.5095313648 -44 41 33.950925564   11.31 10.71     G0III 9 0
4 THA 35-II-3 Y*O 10 10 00.3244888680 -57 02 07.354107816   15.163 13.643 13.001   Be 51 0
5 HD 88773 * 10 12 48.2508535896 -56 09 02.763487260   7.98 7.96     B9V 13 0
6 CD-42 11721 Be* 16 59 06.7629322176 -42 42 08.404228224 12.16 12.28 11.00     B0IVe 168 0
7 IRAS 17216-3801 Y*? 17 25 06.51720 -38 04 00.4368           ~ 35 0
8 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 414 3
9 [WBN74] NGC 7538 IRS 2 Y*? 23 13 45.4691116296 +61 28 19.985984832           ~ 74 0

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