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Reverse engineering a spectrum: using fluorescent spectra of molecular hydrogen to recreate the missing Lyman-α line of pre-main sequence stars

Linsky, J. L. and Herczeg, G. and Wood, B. E. (2008) Reverse engineering a spectrum: using fluorescent spectra of molecular hydrogen to recreate the missing Lyman-α line of pre-main sequence stars. Physica Scripta, T133 . Art. No. 014018. ISSN 0031-8949. https://resolver.caltech.edu/CaltechAUTHORS:LINps08

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Abstract

The hydrogen Lyman-α (Lyα) line, a major source of ionization of metals in the circumstellar disks of pre-main sequence (PMS) stars, is usually not observed due to absorption by interstellar and circumstellar hydrogen. We have developed a technique to reconstruct the intrinsic Lyα line using the observed emission in the H2 B-X lines that are fluoresced by Lyα. We describe this technique and the subsequent analysis of the ultraviolet (UV) spectra of the TW Hya, RU Lupi and other PMS stars. We find that the reconstructed Lyα lines are indeed far brighter than any other feature in the UV spectra of these stars and therefore play an important role in the ionization and heating of the outer layers of circumstellar disks.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0031-8949/2008/T133/014018DOIArticle
http://www.iop.org/EJ/abstract/1402-4896/2008/T133/014018PublisherArticle
http://stacks.iop.org/PhysScr/T133/014018PublisherArticle
ORCID:
AuthorORCID
Herczeg, G.0000-0002-7154-6065
Additional Information:Copyright © 2008 The Royal Swedish Academy of Sciences. Received 17 September 2008, accepted for publication 19 September 2008. Published 19 December 2008. Print publication: Issue T133 (December 2008). This work is funded by Space Telescope Science Institute grant AR-9930 to the University of Colorado. This work is based on observations made in programs 7718, 8041 and 8157 (PIs J L Linsky and F M Walter) of the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
Funders:
Funding AgencyGrant Number
Space Telescope Science InstituteAR-9930
NASA7718
NASA8041
NASA8157
NASANAS 5-26555
Record Number:CaltechAUTHORS:LINps08
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:LINps08
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12753
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:22 Dec 2008 21:26
Last Modified:03 Oct 2019 00:31

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