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Record 3 of 406
A catalog of stellar Lyman-alpha fluxes
External Online Source: doi:10.1086/172589
Author and Affiliation:
Landsman, Wayne(Hughes/STX Corp., NASA, Goddard Space Flight Center)
Simon, Theodore(Hawaii Univ., Honolulu, United States)
Abstract: We present a catalog of stellar Ly-alpha emission fluxes, based on new and archival images obtained with the IUE spacecraft. The catalog includes 227 stars with detectable Ly-alpha emission fluxes, and upper limits on the Ly-alpha emission flux for another 48 stars. Multiple flux measurements are given for 52 stars. We present a model for correcting the observed Ly-alpha flux for attenuation by the local interstellar medium, and we apply this model to derive intrinsic Ly-alpha fluxes for 149 catalog stars which are located in low H I column density directions of the local interstellar medium. In our catalog, there are 14 late-A and early-F stars at B-V = 0.29 or less that show detectable emission at Ly-alpha. We find a linear correlation between the intrinsic Ly-alpha flux and C II 1335 A flux for stars with B-V greater than 0.60, but the A and F stars deviate from this relation in the sense that their Ly-alpha flux is too low. We also find a good correlation between Ly-alpha strength and coronal X-ray emission. This correlation holds over most of the H-R diagram, even for the F stars, where an X-ray deficit has previously been found relative to the transition region lines of C II and C IV.
Publication Date: May 01, 1993
Document ID:
19930051603
(Acquired Dec 28, 1995)
Accession Number: 93A35600
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 408; 1; p. 305-322.
Publisher Information: United States
Contract/Grant/Task Num: NAS5-30446; NAG5-146; NAG5-1823
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 18p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ASTRONOMICAL CATALOGS; LYMAN ALPHA RADIATION; STELLAR RADIATION; ULTRAVIOLET ASTRONOMY; ULTRAVIOLET EMISSION; A STARS; CHROMOSPHERE; F STARS; INTERSTELLAR EXTINCTION; IUE
Imprint And Other Notes: Astrophysical Journal, Part 1 vol. 408, no. 1 p. 305-322. May 1, 1993
Availability Source: Other Sources
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