NDLI: Dust near luminous ultraviolet stars (Document No: 19950009617)

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Dust near luminous ultraviolet stars (Document No: 19950009617)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Henry, Richard C.
Copyright Year	1993
Description	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.
File Size	1543160
Page Count	36
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950009617
Archival Resource Key	ark:/13960/t05x77q51
Language	English
Publisher Date	1993-09-30
Access Restriction	Open
Subject Keyword	Astrophysics Galactic Structure Thermal Emission Thermal Radiation Cosmic Dust Clouds Extinction Infrared Astronomy Satellite Sky Surveys Astronomy Nebulae Interstellar Matter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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