Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..506m&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 15, 1980, p. 506-512.
Astronomy and Astrophysics
Astrophysics
41
Binary Stars, Late Stars, Satellite Observation, Stellar Envelopes, Variable Stars, Balmer Series, Black Body Radiation, Chromosphere, Forbidden Transitions, Hot Stars, Iue, Line Spectra, Stellar Mass Ejection, Ultraviolet Spectra
Scientific paper
IUE observations of R Aquarii (M7 + pec) have been obtained in low dispersion in order to study its circumstellar emission. Strong permitted, semiforbidden, and forbidden emission lines are identified that are superposed on a bright ultraviolet continuum. From the analysis it is deduced that the strong emission-line spectrum that involves semiforbidden C III, C IV, semiforbidden Si III, forbidden O II, and forbidden O III probably arises from a dense compact nebula the size of which is comparable to the binary system of which R Aqr is the primary star. Low-excitation emission lines of Fe II, Mg II, O I, and Si II suggest the presence of a warm chromosphere (T less than about 10,000 K) in the primary M7 late type giant. The secondary is identified as a white dwarf, comparable to or somewhat brighter than the sun, since such a star can produce enough ionizing photons to excite the continuum and emission-line spectrum and yet be sufficiently faint to escape detection by direct observation. The UV continuum observed is attributed to Balmer recombination and not to blackbody emission from the hot companion. The general spectral properties of R Aqr between 1200 A and 3200 A are discussed in the context of the model for the circumstellar nebula, the companion, and the mass-loss rate of the primary star.
Hobbs Richard W.
Kafatos Menas
Michalitsianos Andrew G.
No associations
LandOfFree
IUE observations of circumstellar emission from the late type variable R Aquarii /M7 + pec/ 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 IUE observations of circumstellar emission from the late type variable R Aquarii /M7 + pec/, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IUE observations of circumstellar emission from the late type variable R Aquarii /M7 + pec/ will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1697813