First far-UV observations of KQ Puppis with FUSE

Details First far-UV observations of KQ Puppis with FUSE First far-UV observations of KQ Puppis with FUSE

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..681g&link_type=abstract

Astronomy and Astrophysics, v.399, p.681-686 (2003)

Astronomy and Astrophysics

Astrophysics

1

Stars: Binaries: Spectroscopic, Stars: Individual: Kq Pup, Stars: Mass-Loss, Ultraviolet: Stars

Scientific paper

We report the first far-ultraviolet spectrum of the emission line spectroscopic binary KQ Pup (M2Iab+B0Ve), obtained with FUSE shortly after conjunction at orbital phase Phi =0.13. The spectrum presents a sharp flux cutoff at 1040 Å; longwards, it is dominated by a large amount of resonant and low excitation transitions of neutral and singly ionized species, probably mostly of circumsystem origin, and by the Lyman absorption bands of H2, whose strength corresponds to an interstellar H2 column density of ~ 2x 1020 cm-2, indicating a fraction of molecular hydrogen 2N(H2)/[N(HI)+2N(H2)] of ~ 0.4. An N(HI)/EB-V ratio of 4.3x 1021 is derived from the IUE spectra. The long-term UV monitoring of KQ Pup with IUE, HST and FUSE reveals a large decrease of the far-UV flux since orbital phase 0.82 and occupying more than 0.3 of the orbital period. This ``shell'' episode is attributed to line absorption and to Lyalpha Rayleigh scattering due to an extended dense cool envelope in the line of sight of the B star.
Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985. The HST spectrum used in this paper was obtained from the Multimission Archive at the Space Telescope Science Institute (MAST).

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