Discovery in IC10 of the farthest known symbiotic star

Gonçalves, Denise R.; Magrini, Laura; Munari, Ulisse; Corradi, Romano L. M.; Costa, Roberto D. D.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society: Letters, Volume 391, Issue 1, pp. L84-L87.

Advertised on:
11
2008
Number of authors
5
IAC number of authors
1
Citations
30
Refereed citations
25
Description
We report the discovery of the first known symbiotic star in IC10, a starburst galaxy belonging to the Local Group, at a distance of ~750 kpc. The symbiotic star was identified during a survey of emission-line objects. It shines at V = 24.62 +/- 0.04,V - RC = 2.77 +/- 0.05 and RC - IC = 2.39 +/- 0.02, and suffers from EB- V = 0.85 +/- 0.05 reddening. The spectrum of the cool component well matches that of solar neighbourhood M8III giants. The observed emission lines belong to Balmer series, [SII], [NII] and [OIII]. They suggest a low electronic density, negligible optical depth effects and 35000 < Teff < 90000 K for the ionizing source. The spectrum of the new symbiotic star in IC10 is an almost perfect copy of that of Hen 2-147, a well-known Galactic symbiotic star and Mira. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership. We also retrieved UBVRI images of the `Survey of Local Group Galaxies Currently Forming Stars', Massey et al. (2007). E-mail: denise [at] ov.ufrj.br (denise[at]ov[dot]ufrj[dot]br)
Related projects
Planetary Nebula "The Necklace"
Bipolar Nebulae
This project has three major objectives: 1) To determine the physico-chemical characteristics of bipolar planetary nebulae and symbiotic nebulae, to help understanding the origin of bipolarity and to test theoretical models, mainly models with binary central stars, aimed at explaining the observed morphology and kinematics. 2) To study the low
Antonio
Mampaso Recio