Mathematics – Probability
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..108m&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p.108-108
Mathematics
Probability
Scientific paper
New optical high-resolution (R»50 000) spectra of the star HD 327083 are reported in this work. The Balmer and Fe ii lines show P Cygni profiles, while He i lines are all in pure absorption, ressembling the spectra of the Luminous Blue Variable HR Carinae. However, the blue absorption components of the Balmer lines are more pronounced in HD 327083 than in HR Carinae, indicating a more intense mass loss. We performed a spectroscopic analysis of the Balmer lines (Ha, Hb, Hg and Hd) with a non-LTE code to analyse extended atmospheres. The basic assumptions are: spherical symmetry, stationary and homogeneity. The density structure r(r) is related to the mass loss rate and the velocity field via the equation of continuity. The velocity field is pre-specified in an ad-hoc way as a b-type law. The statistical equilibrium equations are solved using the escape probability method for calculating the source function while the transfer equation is solved using the "SEI" - Sobolev Exact Integration - method. Due the large number of "free" parameters we constructed a primary grid of models (theoretical profiles) based on the results provided by theoretical evolutionary paths. In other words, the input parameters L«, T«, and AHe are those provided as output data of the evolutive models. We chose the tracks of the Geneve group since they are available in the WEB in the range of initial masses from Mi = 25 M¤ to 120 M¤. The derived stellar parameters for HD 327083 are: log(L«/L¤) = 6.0, T« = 11500 K, = 8.0´10-5 M¤/yr and He/H = 0.2 (by number). From these results and considering the similarity with HR Carinae we concluded that HD 327083 is a superluminous object in an evolved phase of an evolutive track of MZAMS~ 60 M¤. It might be a B[e] Supergiant but it is most likely to be about to enter in a typical LBV phase.
de Araújo Francisco Xavier
Machado M. A. D.
No associations
LandOfFree
Spectroscopic analysis of the superluminous HD327083 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spectroscopic analysis of the superluminous HD327083, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectroscopic analysis of the superluminous HD327083 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1665538