we have recently discovered a shell source in cygnus and identified its central star. all data available up to now in the radio, iras and optical regime are consistent with an interpretation that we have found an hitherto unknown lbv surrounded by a nearly perfect wind blown bubble. as the star apparently undergoes an interstellar extinction of about 16 magnitudes there is no hope to study the interaction of its strong stellar wind at optical or even shorter wavelengths. as lbvs are rare objects and none features a well defined wind blown bubble we may have caught one at a special time of its evolution. as the iras data strongly indicate that there are at least 2 ir components, one maybe directly near the star and the other connected with either the ionized or neutral shell we want to map the spectral energy distribution of the 4. bubble at 8 wavelengths with different isophot filters. with these maps we want to disentangle the spatial and spectral components. as the expected geometry is that of many filaments as usual in ring nebulae we expect several such components. in the end the temperature and density distribution shall be derived which shall help to model the interaction of a wind with the ambient medium, a wind which may have changed its properties only recently. as the amount of circumstellar and ambient dust is critical for cooling down hot gas from the wind shocks and as contaminations of continuum emission by strong emission lines (cii,oi,oiii) is expected with large line to continuum ratios we also want to map these lines. in addition the line ratios will be used to derive electron densities of the cool and warm gas components.
Instrument
LWS02 , PHT03 , PHT32
Temporal Coverage
1996-11-03T04:23:47Z/1996-12-02T01:01:58Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, WENDKER et al., 1999, 'G 79.29+0.46: A NEW LBV AND ITS SHELL. A SURPRISINGLY PERFECT BUBBLE AROUND AN LBV.', 1.0, European Space Agency, https://doi.org/10.5270/esa-l3o15hq
