2012A&A...542A..95R


Query : 2012A&A...542A..95R

2012A&A...542A..95R - Astronomy and Astrophysics, volume 542A, 95-95 (2012/6-1)

9 Sagittarii: uncovering an O-type spectroscopic binary with an 8.6 year period.

RAUW G., SANA H., SPANO M., GOSSET E., MAHY L., DE BECKER M. and EENENS P.

Abstract (from CDS):

The O-type object 9 Sgr is a well-known synchrotron radio emitter. This feature is usually attributed to colliding-wind binary systems, but 9Sgr was long considered a single star. We have conducted a long-term spectroscopic monitoring of this star to investigate its multiplicity and search for evidence for wind-wind interactions.Radial velocities are determined and analysed using various period search methods. Spectral disentangling is applied to separate the spectra of the components of the binary system.We derive the first ever orbital solution of 9Sgr. The system is found to consist of an O3.5V((f+)) primary and an O5-5.5V((f)) secondary moving around each other on a highly eccentric (e=0.7), 8.6 year orbit. The spectra reveal no variable emission lines that could be formed in the wind interaction zone in agreement with the expected properties of the interaction in such a wide system.Our results provide further support to the paradigm of synchrotron radio emission from early-type stars being a manifestation of interacting winds in a binary system.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: spectroscopic - stars: fundamental parameters - stars: massive - stars: individual: 9 Sgr

VizieR on-line data: <Available at CDS (J/A+A/542/A95): files.dat sp/*>

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 - 2023
#notes
1 HD 15558 Y*O 02 32 42.5366901168 +61 27 21.572901360 7.82 8.37 7.87 7.34 6.94 O4.5III(f) 309 0
2 HD 46150 Em* 06 31 55.5205071744 +04 56 34.296516096 6.03 6.86 6.73 6.50 6.41 O5V((f))z 386 0
3 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.45 4.68   4.88 O7V+B1.5/2V 781 0
4 HD 93128 SB* 10 43 54.3957741024 -59 32 57.497266716 8.82 8.97 8.77 9.40 8.71 O3.5V((fc))z 96 1
5 M 8 HII 18 03 37 -24 23.2           ~ 598 1
6 * 9 Sgr Em* 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 531 0
7 NGC 6530 OpC 18 04 31 -24 21.5           ~ 400 0
8 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 218 0
9 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 238 0

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2023.02.01-07:35:21

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