Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...547l.155d&link_type=abstract
The Astrophysical Journal, Volume 547, Issue 2, pp. L155-L159.
Astronomy and Astrophysics
Astronomy
13
Ism: Abundances, Ism: Individual: Name: Carina Nebula, Ism: Kinematics And Dynamics, Ism: Lines And Bands, Ism: Structure, Ultraviolet: Ism
Scientific paper
Two observations of the complex interstellar absorption-line profiles in the UV spectrum of CPD -59°2603, obtained 22 months apart in the R~110,000 mode of the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, reveal substantial variations in the intensities of several high-velocity components, including the virtual disappearance of one of them. These are the first observations of interstellar temporal variations in dominant ions to our knowledge. The most probable interpretation is motion across the line of sight of discrete absorbing features in the near foreground of the O-type star, within the Carina Nebula. Ground-based survey data also indicate that the extreme interstellar profiles throughout this region originate relatively near the most massive stars, suggesting an origin related to their stellar winds. The morphological similarity of these profiles to a low-ionization, narrow-line system in a quasi-stellar object (QSO) spectrum is pointed out. Time variability may provide a critical test among different interpretations of such QSO systems. Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
Danks Anthony C.
Gales Joel
García Beatriz
Landsman Wayne B.
Vieira Gladys
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