Dust near luminous ultraviolet stars

Details Dust near luminous ultraviolet stars Dust near luminous ultraviolet stars

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jhu..reptq....h&link_type=abstract

Final Report Johns Hopkins Univ., Baltimore, MD. Center for Astrophysical Sciences.

Astronomy and Astrophysics

Astronomy

Cosmic Dust, Galactic Structure, Infrared Astronomy Satellite, Interstellar Matter, Nebulae, Sky Surveys (Astronomy), Thermal Emission, Bibliographies, Clouds, Extinction, Thermal Radiation

Scientific paper

This report describes research activities related to the Infrared Astronomical Satellite (IRAS) sky survey. About 745 luminous stars were examined for the presence of interstellar dust heated by a nearby star. The 'cirrus' discovered by IRAS is thermal radiation from interstellar dust at moderate and high galactic latitudes. The IRAS locates the dust which must (at some level) scatter ultraviolet starlight, although it was expected that thermal emission would be found around virtually every star, most stars shown no detectable emission. And the emission found is not uniform. It is not that the star is embedded in 'an interstellar medium', but rather what is found are discrete clouds that are heated by starlight. An exception is the dearth of clouds near the very hottest stars, implying that the very hottest stars play an active role with respect to destroying or substantially modifying the dust clouds over time. The other possibility is simply that the hottest stars are located in regions lacking in dust, which is counter-intuitive. A bibliography of related journal articles is attached.

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