High-Resolution UV Absorption Observations of the Local Interstellar Cavity

We present far-ultraviolet (1245–1680 Å), high-resolution ( R ∼ 3 km s-1 R ∼ 3     km   s - 1 ) spectroscopic observations of three early-type stars (HD 32630, HD 158427, and HD 175191) located within 75 pc of the Sun recorded with the recently refurbishedHST-STIS instrument. These data have allowed...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 2010-11, Vol.122 (897), p.1320-1333
Hauptverfasser: Welsh, Barry Y., Lallement, Rosine
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Sprache:eng
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Zusammenfassung:We present far-ultraviolet (1245–1680 Å), high-resolution ( R ∼ 3 km s-1 R ∼ 3     km   s - 1 ) spectroscopic observations of three early-type stars (HD 32630, HD 158427, and HD 175191) located within 75 pc of the Sun recorded with the recently refurbishedHST-STIS instrument. These data have allowed an absorption study of the local interstellar gas to investigate some of its physical, chemical, and kinematic properties. A local stellar continuum level was assigned to each of the various interstellar absorption lines, and the resultant residual-intensity absorption profiles were then fit with a theoretical multicomponent model of interstellar cloud component velocity and cloud component column density. These model parameters were then used to investigate the physical and chemical states of the local gas along each of the three interstellar sight lines. Eleven velocity components were required to fit all of the observed absorption line profiles, and we have identified the source of most of this absorption as arising in gas associated with the Local Interstellar Cloud (LIC) complex distance of
ISSN:0004-6280
1538-3873
DOI:10.1086/657323