Physics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..25....2a&link_type=abstract
The Messenger, No.25, P. 2, 1981
Physics
Scientific paper
The class of bright blue variable stars, which we call "Hubble-Sandage" or "s Dor" variables, contains some of the most luminous stars known in the universe. At maximum light at least their visual brightness may surpass that of any known non-variable star. Because of their high luminosity and since these stars can be distinguished from faint galactic foreground stars by their particular light curves, the identification of such objects in extragalactic systems is relatively easy, and a considerable number of these stars has been discovered in nearby galaxies. Since they can be detected over so large distances, Hubble-Sandage variables could in principle provide a useful tool in the calibration of the extragalactic distance scale and in studies of the physical conditions in extragalactic systems. However, before such investigations can be considered, we first have to learn much more about the nature and structure of these stars. Since all these objects are blue and since as a rule Hubble-Sandage variables are surrounded by dense expanding circumstellar envelopes, spectroscopic observations at ultraviolet wavelengths (where the most common ions in these envelopes have their strongest spectral lines) are particularly important for clarifying the nature of these stars. Therefore, we used the International Ultraviolet Explorer (IUE) satellite to observe some of these objects.
Appenzeller Immo
Stahl Otmar
Wolf Bernd
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