Interstellar O VI Absorption in the Monogem Ring and the GUM Nebula

Details Interstellar O VI Absorption in the Monogem Ring and the GUM Nebula Interstellar O VI Absorption in the Monogem Ring and the GUM Nebula

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.5106j&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #51.06; Bulletin of the American Astronomical Society, Vol. 29, p.1296

Astronomy and Astrophysics

Astronomy

Scientific paper

On a flight of the ORFEUS-SPAS mission in November-December 1996, the Interstellar Medium Absorption Profile Spectrograph (IMAPS) recorded high-resolution spectra of a number of hot stars over a wavelength interval that included the resonance absorption features of O VI at 1032 and 1038 Angstroms. O VI is an important tracer of interstellar gases at a temperature T~ 3x 10(5) K. Two noteworthy targets that were observed were 15 Mon, a star behind the Monogem Ring, and HD64760, a star within or behind the Gum Nebula. Distinct absorption features from interstellar O VI appear on top of the slowly varying stellar continua in the spectra of both stars: 15 Mon shows a shallow and very broad feature centered at a heliocentric radial velocity of about +35 km s(-1) and a stronger, asymmetric one with a peak absorption at v=+105 km s(-1) , while HD64760 exhibits an extraordinarily strong feature at v=+35 km s(-1) (central depth = 45% at 1032 Angstroms, FWHM = 80 km s(-1) ) that is situated between distinct, weaker ones centered at -195 and +155 km s(-1) . In the future, the O VI features may be compared with much weaker absorptions by species at lower ionization levels so that we can improve our understanding of the origin and dynamics of the O VI-bearing material. Already, there is evidence from an HST archive spectrum of 15 Mon that the main, low-velocity interstellar Mg II absorption for this star is accompanied by narrow, weak features at v=+57 and +86 km s(-1) .

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