2022A&A...657A.137G


Query : 2022A&A...657A.137G

2022A&A...657A.137G - Astronomy and Astrophysics, volume 657A, 137-137 (2022/1-1)

The symbiotic binary St 2-22: Orbital and stellar parameters and jet evolution following its 2019 outburst.

GALAN C., MIKOLAJEWSKA J., ILKIEWICZ K., MONARD B., ZYWICA S.T. and ZAMANOV R.K.

Abstract (from CDS):


Context. St 2-22 is a relatively poorly studied S-type symbiotic system that belongs to a small group of jet-producing systems as a result of disc accretion onto a white dwarf fed by its red giant companion.
Aims. The goal of this paper is to analyse the nature and derive the basic parameters of St 2-22, and to follow the jet evolution.
Methods. Photometric monitoring for over 16 yr and high-quality spectroscopic data enabled us to shed new light on its nature. The high-resolution SALT spectra and V Ic photometry obtained during and between the last two outbursts have been used to search for periodic changes, to derive spectroscopic orbits of both system components, and to study the outburst and jet evolution.
Results. We present the orbital and stellar parameters of the system components. The orbital period is Porb = 918 ±6d. The double-line spectroscopic orbits indicate the mass ratio q=Mg/Mh=3.50±0.53, and the components masses Mgsin3i∼2.35M and Mhsin3i∼0.67M. The orbit shows significant eccentricity, e = 0.16 ±0.07. The orbital inclination is close to 70°. During outbursts, accelerating and decelerating jets are observed with changes in their radial velocity component in a range from ∼1500 up to nearly 1800 km s–1. St 2-22 turned out to be a classical symbiotic system very similar to the precursor of the group - Z And.

Abstract Copyright: © ESO 2022

Journal keyword(s): binaries: symbiotic - stars: jets - novae, cataclysmic variables - stars: individual: St 2-22 (PN Sa 3-22)

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 - 2023
#notes
1 V* AX Per Sy* 01 36 22.7004366768 +54 15 02.411547480   11.45 10.67 11.04   M3IIIep+A0 286 1
2 PN Sa 3-22 Sy* 13 14 30.3005092416 -58 51 49.628844504       13.91 12.06 M4.5III 21 1
3 V* RS Oph Sy* 17 50 13.1591484960 -06 42 28.480729788   11.884 10.776 11.228   K5.5/M0IIIe 1036 0
4 V* AR Pav LP* 18 20 27.8820649248 -66 04 42.928979808   11.36 7.40     B1 152 0
5 V* V3890 Sgr No* 18 30 43.2877623168 -24 01 08.944843980     15.944 14.798 12.611 ~ 176 0
6 V* FN Sgr Sy* 18 53 54.7734717504 -18 59 40.659146196           M5IIIe 55 0
7 V* CI Cyg Sy* 19 50 11.8342618008 +35 41 03.004794996   11.97 9.90     M4.9III 414 0
8 V* Z And Sy* 23 33 39.9553225728 +48 49 05.974867308 8.86 9.35 8.00     M2III+B1eq 514 0

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2023.01.31-02:24:43

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