Volume 369, Number 1, April I 2001
|Page(s)||L1 - L4|
|Published online||15 April 2001|
Discovery of a bipolar and highly variable mass outflow from the symbiotic binary StHα 190*
Osservatorio Astronomico di Padova, Sede di Asiago, 36032 Asiago (VI), Italy
2 Center of Studies and Activities for Space (CISAS "G. Colombo"), Uniersity of Padova, Italy
3 Center for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, 87100 Torun, Poland
4 Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow 119899, Russia
5 Department of Physics, Univ. of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
6 Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
7 Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
8 Centro Galileo Galilei -CNAA, Calle Alvarez de Abreu 70, 38700 Santa Cruz de La Palma (TF), Spain
Corresponding author: U. Munari, firstname.lastname@example.org
Accepted: 6 February 2001
A highly and rapidly variable bipolar mass outflow from StHα 190 has been discovered, the first time in a yellow symbiotic star. Permitted emission lines are flanked by symmetrical jet features and multi-component P-Cyg profiles, with velocities up to 300 km s-1. Given the high orbital inclination of the binary, if the jets leave the system nearly perpendicular to the orbital plane, the de-projected velocity equals or exceeds the escape velocity (1000 km s-1). StHα 190 looks quite peculiar in many other respects: the hot component is an O-type sub-dwarf without an accretion disk or a veiling nebular continuum and the cool component is a G7 III star rotating at a spectacular 105 km s-1, unseen by a large margin in field G giants.
Key words: binaries: symbiotic / stars: individual: StHα 190 / interstellar medium: jets and outflows
© ESO, 2001
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