EDP Sciences
Free access
Issue
A&A
Volume 441, Number 3, October III 2005
Page(s) 1099 - 1109
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20042485


A&A 441, 1099-1109 (2005)
DOI: 10.1051/0004-6361:20042485

On the progenitor of V838 Monocerotis

R. Tylenda1, 2, N. Soker3 and R. Szczerba1

1  Department for Astrophysics, N. Copernicus Astronomical Center, Rabianska 8, 87-100 Torun, Poland
    e-mail: [tylenda;szczerba]@ncac.torun.pl
2  Centre for Astronomy, N. Copernicus University, 87-100 Torun, Poland
3  Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel
    e-mail: soker@physics.technion.ac.il

(Received 6 December 2004 / Accepted 9 June 2005)

Abstract
We summarize and analyze the available observational data on the progenitor and the environment of V838 Mon. From the available photometric data for the progenitor of V838 Mon we exclude the possibility that the object before eruption was an evolved red giant star (AGB or RGB star). We find that most likely it was a main sequence or pre-main sequence star of ${\sim} 5{-}10~ M_\odot$. From the light echo structure and evolution we conclude that the reflecting dust is of interstellar nature rather than blown by V838 Mon in the past. We discuss the IRAS and CO data for interstellar medium observed near the position of V838 Mon. Several interstellar molecular regions have radial velocities similar to that of V838 Mon, so dust seen in the light echo might be related to one of them.


Key words: stars: early-type -- stars: binaries: close -- stars: circumstellar matter -- stars: individual: V838 Mon -- ISM: reflection nebulae -- ISM: structure

SIMBAD Objects



© ESO 2005