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The Advanced Spectral Library (ASTRAL): Reference Spectra for Evolved M StarsThe HST Treasury Program Advanced Spectral Library Project: Cool Stars was designed to collect representative, high-quality UV spectra of eight evolved FM type cool stars. The Space Telescope Imaging Spectrograph (STIS)echelle spectra of these objects enable investigations of a broad range of topics, including stellar and interstellar astrophysics. This paper provides a guide to the spectra of the two evolved M stars, the M2 Iab supergiant Oriand the M3.4 giant Cru, with comparisons to the prototypical K1.5 giant Boo. It includes identifications of the significant atomic and molecular emission and absorption features and discusses the character of the photospheric and chromospheric continua and line spectra. The fluorescent processes responsible for a large portion of the emission-line spectrum, the characteristics of the stellar winds, and the available diagnostics for hot and cool plasmas are also summarized. This analysis will facilitate the future study of the spectra, outer atmospheres, and winds, not only of these objects but of numerous other cool, low-gravity stars, for years to come.
Document ID
20190025303
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.3847/1538-4357/aaf164
Authors
Carpenter, Kenneth G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nielson, Krister E. (Catholic Univ. of America Washington, DC, United States)
Kober, Gladys V. (Catholic Univ. of America Washington, DC, United States)
Ayers, Thomas R. (Colorado Univ. Boulder, CO, United States)
Wahlgren, Glenn M. (Space Telescope Science Institute (STScI) Baltimore, MD, United States)
Rau, Gioia (Catholic Univ. of America Washington, DC, United States)
Date Acquired
May 23, 2019
Publication Date
December 21, 2018
Publication Information
Publication: The Astrophysicial Journal
Publisher: The American Astronomical Society
Volume: 869
Issue: 2
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN64711
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: NNX17AC49G
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Technical Review
NASA Peer Committee
Keywords
The HST Treasury Program Advanced Spectral Library Project: Cool Stars

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