IUE observations of eight OB stars in NGC 2244 - Ultraviolet continua and extinction

Details IUE observations of eight OB stars in NGC 2244 - Ultraviolet continua and extinction IUE observations of eight OB stars in NGC 2244 - Ultraviolet continua and extinction

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..201m&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 201-213.

Astronomy and Astrophysics

Astronomy

10

Early Stars, Interstellar Extinction, Interstellar Matter, Iue, Stellar Spectrophotometry, Ultraviolet Astronomy, B Stars, O Stars, Open Clusters, Stellar Atmospheres, Stellar Magnitude, Stellar Spectra

Scientific paper

Low-resolution IUE ultraviolet continuum observations of O and B stars in the young open cluster NGC 2244 are presented. When only relative energy distributions are considered, thereby eliminating any dependence on reddening corrections or absolute energy calibrations, it is found that the ultraviolet energy distributions of the O stars have significantly cooler ultraviolet color temperatures than the cluster early B stars. The effect is not considered a property of the B stars because their observed continua can be well represented by model atmospheres and ultraviolet extinction characteristic of the local interstellar medium. The effect is thus thought to originate with the O star continua and can be due to either interstellar effects (the cluster O stars suffer additional extinction which has an anomalous wavelength dependence) or stellar effects (the physics incorporated into current O star model atmospheres is inadequate). It is noted that current data do not allow a definitive distinction to be made between these two alternatives, and the possible origins and consequences of each are considered.

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