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Dear Sebastian, The conclusion that the progenitor was an F-type star by Munari et al. (2002) was based on a distance of 790+/-30 pc. However later detailed works (Bond et al. 2003; Tylenda 2003, Crause et al. 2003) showed that the light echo can only give a lower limit on the distance, which is 5-8 Kpc. Crause's work uses the latest images and thus their lower limit of D > 8 Kpc is the best value. A factor of 10 in the distance makes a huge difference. Regards, Alon ----------------------------------------------------------------------- Dr. Alon Retter Tel. (work) +61-2-9351-4058 School of Physics Fax (work) +61-2-9351-7726 University of Sydney ------------------------------------------- Sydney, 2006 "As a scientist I don't believe myself, so Australia why should I believe you?" (A.R. 1965-2085) http://vsnet.physics.usyd.edu.au/~retter/ ----------------------------------------------------------------------- On Mon, 22 Sep 2003, Sebastian Otero wrote: > http://vsnet.usyd.edu.au/news/newsevents/articles/2003/sep/16_star.shtml > > About V838 Mon. > My question is: wasn't the progenitor an F-type star?? It seems it was a red > giant. > Someon ecould clarify? > > Thanks! > Sebastian. > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://vsnet.grisoft.com). > Version: 6.0.518 / Virus Database: 316 - Release Date: 11/09/03 > >
Return to the Daisaku Nogami
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