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Ultraviolet observations of alpha Aurigae from CopernicusEmission lines of L-alpha (1215.67 A) and O VI (1031.94 A) were detected in the spectroscopic binary alpha Aur (Capella) with the Princeton experiment on Copernicus. Temperatures of the emitting regions are inferred to be in excess of 300,000 K. The temperature and emission measure are consistent with a variable source of soft X-rays. If the emission is attributed to the primary star (G5 III), the atmosphere is expanding with velocities of about 20-100 km/s. Such expansion can lead to material within the binary system. The density of interstellar hydrogen inferred from absorption of stellar L-alpha appears to be approximately 0.01 hydrogen atoms per cu cm.
Document ID
19750059556
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dupree, A. K.
Date Acquired
August 8, 2013
Publication Date
August 15, 1975
Publication Information
Publication: Astrophysical Journal
Volume: 200
Subject Category
Astronomy
Accession Number
75A43628
Funding Number(s)
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: NGR-22-007-285
Distribution Limits
Public
Copyright
Other

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