Astronomy & Astrophysics

Free access article

Issue		A&A Volume 369, Number 1, April I 2001
Page(s)		L1 - L4
Section		Letters
DOI		10.1051/0004-6361:20010210

A&A 369, L1-L4 (2001)
DOI: 10.1051/0004-6361:20010210

Discovery of a bipolar and highly variable mass outflow from the symbiotic binary StH $\alpha$ 190

U. Munari^{1, 2}, T. Tomov^{2, 3}, B. F. Yudin⁴, P. M. Marrese^{1, 2}, T. Zwitter⁵, R. G. Gratton⁶, G. Bonanno⁷, P. Bruno⁷, A. Calí⁷, R. U. Claudi⁶, R. Cosentino^{7, 8}, S. Desidera⁶, G. Farisato⁶, G. Martorana¹, G. Marino⁸, M. Rebeschini¹, S. Scuderi⁷ and M. C. Timpanaro⁷

¹ 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

(Received 26 January 2001 / Accepted 6 February 2001 )

Abstract
A highly and rapidly variable bipolar mass outflow from StH $\alpha$ 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). StH $\alpha$ 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: StH $\alpha$ 190 -- interstellar medium: jets and outflows

Offprint request: U. Munari, ulisse@ulisse.pd.astro.it

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Discovery of a bipolar and highly variable mass outflow from the symbiotic binary StH 190

Discovery of a bipolar and highly variable mass outflow from the symbiotic binary StH $\alpha$ 190