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Dear Timothy, Indeed, some of the observed properties of V838 Mon were similar to the "born-again" type stars (Helium shell flashes) - relatively slow expansion rates and red colours. However, the light curve of V838 Mon is completely different than these cases (V4334 Sgr not V434 Sgr!, V605 Aql and FG Sge). Their light curves were relatively smooth (no several maxima as in V838 Mon) and the decline from maximum took several years or about a decade (as far as I remember) while V838 Mon returned to quiescence after a few months. In addition, the rise to maximum was very fast in V838 Mon compared with these objects. 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 Tue, 23 Sep 2003, Timothy M. Lawlor wrote: > Hi all, > > V838 Mon is indeed an interesting object. What are the main arguments > against it > being a "born-again" type, or like star (e.g. V434 Sgr or V605 Aql)? > V838 Mon has a light curve that sure looks a lot like our "born-again", > models. > > Cheers, > Tim Lawlor > ***************************************************************** > Timothy M. Lawlor, Assistant Professor > and Director, Friedman Observatory > Department of Physics > Penn State Wilkes-Barre > PO Box PSU > Lehman, Pa 18627 > ***************************************************************** > HOME PAGE http://vsnet.personal.psu.edu/faculty/t/m/tml10/ > FRIEDMAN OBSERVATORY http://vsnet.wb.psu.edu/observatory > Phone: 570 675-9278 > FAX: 570 674-9072
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