Distribution of hot stars and hydrogen in the Large Magellanic Cloud

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5635646

Page, T; Carruthers, G R

Imagery of the Large Magellanic Cloud (LMC), in the wavelength ranges 1050 to 1600 A and 1250 to 1600 A, was obtained by the S201 far ultraviolet camera during the Apollo 16 mission. These images were reduced to absolute far-UV intensity distributions over the area of the LMC, with 3 to 5 arc min angular resolution. Comparison of these far-UV measurements in the LMC with H sub alpha and 21 cm surveys reveals that interstellar hydrogen in the LMC is often concentrated in 100 pc clouds within 500 pc clouds. Furthermore, at least 25 associations of O-B stars in the LMC are outside the interstellar hydrogen clouds four of them appear to be on the far side. Far-UV and mid-UV spectra were obtained of stars in 12 of these associations, using the International Ultraviolet Explorer. Equivalent widths of L alpha and six other lines, and relative intensities of the continuum at seven wavelength from 1300 A to 2900 A, were measured. These spectra are also discussed.

• Research Organization: National Aeronautics and Space Administration, Houston, TX (USA). Lyndon B. Johnson Space Center
• OSTI ID: 5635646
• Report Number(s): NASA-TM-82375
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
FAR ULTRAVIOLET RADIATION
GALAXIES
HYDROGEN
LYMAN LINES
MAGELLANIC CLOUDS
NONMETALS
RADIATIONS
SPATIAL DISTRIBUTION
SPECTRA
STARS
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA