AAS 196th Meeting, June 2000
Session 27. The ISM of Extragalactic Sources and The Outer Galaxy
Display, Tuesday, June 6, 2000, 10:00am-6:30pm, Empire Hall South

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[27.01] High Velocity Interstellar Lines and Temporal Variations in the UV Spectra of Stars in the Carina Nebula

A.C. Danks (Raytheon ITSS and GSFC/NASA), N.R. Walborn (STScI), G.L. Vieira (Raytheon ITSS and GSFC/NASA), J.M. Gales (Futuretech and GSFC/NASA), W.B. Landsman (Raytheon ITSS and GSFC/NASA), B. Garcia (Centro Regional de Investigaciones Cientificas y Tecnicas), S.J. Hulbert (STScI)

UV observations of 4 stars in the Carina Nebula region have been obtained with STIS at a resolution of R ~ 110,000. All four stars demonstrate numerous high velocity components extending over ranges ~ ± 200 km/sec. In particular two observations of the star CPD -59 2603 have been obtained 22 months apart and demonstrate substantial variations in the intensities of the high velocity components of Mg II 2796.35, 2803.53 and Mg I 2852.96 lines. The origin of the variations is discussed. Furthermore, there is a marked similarity in the shape of the absorption features with those seen in narrow-lines QSO systems, which may shed light on the origin of these features.

This work was supported by NASA through the STIS GTO funding.

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The author(s) of this abstract have provided an email address for comments about the abstract: danks@ambrose.gsfc.nasa.gov

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