Current day mass loss rate for Luminous Blue Variable IRAS 18576+0341

Free access article

Issue		A&A Volume 437, Number 1, July I 2005


Page(s)		L1 - L5
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500126

A&A 437, L1-L5 (2005)
DOI: 10.1051/0004-6361:200500126

Letter

Current day mass loss rate for Luminous Blue Variable IRAS 18576+0341

G. Umana^{1, 2}, C. S. Buemi², C. Trigilio² and P. Leto²

¹ INAF - Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania Italy
² INAF - Istituto di Radioastronomia Sezione di Noto, CP 141, 96017 Noto (SR), Italy
e-mail: g.umana@ira.inaf.it

(Received 23 February 2005 / Accepted 13 May 2005 )

Abstract
In this letter we report on the first set of multi-frequency and high angular resolution radio observations of IRAS 18576+0341 . The radio observations have revealed an extended, asymmetric and quite structured radio nebula and allowed us to locate the central core of this highly obscured new galactic Luminous Blue Variable. From the analysis of radio properties of IRAS 18576+0341 estimates of important physical parameters of the central star have been determined. In particular, an effective temperature of $T_{\rm eff} \sim (2.6 \pm 0.2)$ $\times$ $10^{4}~{\rm K}$ , corresponding to a B0-B0.5 supergiant, has been derived. The most notable result is the determination of the current day mass-loss ( $\dot {M}= 3.7$ $\times$ $10^{-5}~M_{\odot}~{\rm yr}^{-1}$ ), which is of particular importance since mass-loss rate determination from radio observations appears to be a more reliable method compared to the others based on different diagnostics.

Key words: circumstellar matter -- stars: winds, outflows -- stars: mass-loss -- radio continuum: stars -- stars: individual: IRAS 18576+0341, AFGL 2298

SIMBAD Objects in preparation

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.