2002A&A...395..117S


Query : 2002A&A...395..117S

2002A&A...395..117S - Astronomy and Astrophysics, volume 395, 117-127 (2002/11-3)

Orbital motion in symbiotic Mira systems.

SCHMID H.M. and SCHILD H.

Abstract (from CDS):

We present new spectropolarimetry of the Raman lines for seven symbiotic Miras, combine it with earlier data and review the polarimetric changes. All systems show slow and usually steady angular variations which are most easily interpreted as a reflection of the orbital motion. We measure angular rotation rates of typically 1 to 5°/yr. Small position angle changes are seen in Hen 2-106 and RR Tel, while Hen 2-38 and Hen 2-127 have high rotation rates. Although our database spreads over a time span of almost 10 years, we still cover only a fraction of a typical D-type orbit. Since we expect elliptical orbits, it is too early to extrapolate to an orbital period for any individual object. In a statistical sense, however, our mean angular rotation rate shows that an average orbital period for a symbiotic Mira is 150 years. We also determine the position angle of the binary axes as projected onto the sky. Our polarimetry finally suggests that the binary axes of the systems V1016 Cyg and Hen 2-38 are not far from parallel to the line of sight (conjunction), whereas the binary axes of RR Tel and AS 210 lie approximately at an angle of 90° to the line of sight.

Abstract Copyright:

Journal keyword(s): stars: binaries: symbiotic - stars: AGB and post-AGB - stars: circumstellar matter - polarization - scattering

Simbad objects: 8

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Number of rows : 8
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 ACO S 210 ClG 01 57 22.3 -64 22 40           ~ 8 0
2 WRAY 16-62 Sy* 09 54 43.2887829456 -57 18 52.419901680   13.77 12.92 13.01 10.93 M5-7.5 97 0
3 WRAY 16-148 Sy* 14 14 09.4115687736 -63 25 46.319333808     14.00     Me 133 1
4 WRAY 16-180 Sy* 15 24 49.7859801424 -51 49 52.587850026     15.501   13.128 M3.5-7e 66 1
5 EM* AS 210 Sy* 16 51 20.4046944360 -26 00 26.822670444   11.5 11.9     ~ 72 1
6 V* HM Sge Sy* 19 41 57.0795884928 +16 44 39.805863828   12.37 10.99 12.217   M7 449 0
7 EM* AS 373 Sy* 19 57 05.0166505224 +39 49 36.076143036     11.50   10.592 M6/8e 582 0
8 V* RR Tel Sy* 20 04 18.5404499712 -55 43 33.153979080 9.93 11.33 10.81 11.689   M5e 531 0

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