2005A&A...440..239B


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.22CEST17:35:25

2005A&A...440..239B - Astronomy and Astrophysics, volume 440, 239-248 (2005/9-2)

The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr.

BRANDI E., MIKOLAJEWSKA J., QUIROGA C., BELCZYNSKI K., FERRER O.E., GARCIA L.G. and PEREIRA C.B.

Abstract (from CDS):

We present a study of the eclipsing symbiotic binary FN Sgr with a period of 568.3 days determined photometrically and confirmed spectroscopically. The hot component underwent a 2.5mag eruption covered by most of our spectroscopic observations. In particular, we have determined for the first time spectroscopic orbits based on the radial velocity curves for both components. A set of blue absorption lines resembling an A-F type star is present in all our spectra and they seem to be associated with the hot component. Based on the light curve, we derive the red giant's radius (140R) and the orbital inclination (i=80°). We find that FN Sgr is similar to other S-type symbiotic binaries, composed by an M 5-type giant (Mg=1.5M) and a hot white dwarf (Mh=0.7M, Rh=0.2R) with a binary separation of ∼1.6AU. The red giant is just filling its Roche lobe and a geometrically and optically thick accretion disk is likely to be present around the low-mass accretor. The evolution of Th and Lh along the active phase argues in favour of accretion disk instabilities similar to those of Z And. We have also studied spectral changes and photometric variations as a function of both the hot component activity and the orbital motion.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stars: binaries: symbiotic - stars: fundamental parameters - stars: individual: FN Sgr

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* AX Per Sy* 01 36 22.6996835649 +54 15 02.411289057   11.45 10.67 11.04   M3IIIep+A0 274 1
2 V* AR Pav Al* 18 20 27.8818737427 -66 04 42.931712420   11.36 7.40     B1 144 0
3 V* FN Sgr Sy* 18 53 54.7732843778 -18 59 40.660080929     9.00     M4 50 0
4 V* CI Cyg Al* 19 50 11.8344401438 +35 41 03.000692799   11.97 9.90     Bep+M5III 403 0
5 EM* AS 373 Sy* 19 57 05.0184580246 +39 49 36.085051314         10.592 M6/8e 564 0
6 V* Z And Sy* 23 33 39.9551345052 +48 49 05.973842875 8.86 9.35 8.00     M2III+B1eq 498 0
7 V* R Aqr Sy* 23 43 49.4629939776 -15 17 04.184232557   8.823 7.683 9.37   M6.5-8.5e 726 0

    Equat.    Gal    SGal    Ecl

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2019.09.22-17:35:25

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