Scientific Results

Preliminary scientific results from UVSTAR: The FUV spectra of BD+28° 4211 and NGC 246

Year: 1998

Authors: Stalio R., Bratina V., Holberg J.

Autors Affiliation: Dipartimento di Astronomia, Università di Trieste, Italy; Ctr. for Adv. Res. in Space Optics, Area Science Park, Trieste, Italy; Lunar and Planetary Laboratory, University of Arizona, United States

Abstract: UVSTAR, Ultraviolet Spectrograph Telescope for Astronomical Research operates in the 500 – 1200 Å waveband; it has capability for long slit spectral imaging of extended cosmic sources. UVSTAR has recently flown as a Hitchhiker-M payload on the STS 85 mission (August 7-18, 1997) of the Shuttle Discovery. UVSTAR is a joint collaboration between the University of Arizona (Tucson) and the University of Trieste. The instrument consists of a movable platform and an optical system. The platform provides fine pointing (±5 arcsec) within ±3 degrees from the nominal view direction, which is near the Shuttle +Y axis, i.e. perpendicular to the long axis of the Shuttle and in the plane of the wings. The optical system has two channels, each formed of a telescope and Rowland concave-grating spectrograph with intensified CCD detector. The first channel, FUV, operates in the 850 – 1250 Å spectral range, the second, EUV, has covered the 500 – 900 Å region. UVSTAR includes capabilities for independent target acquisition and tracking. Here we report FUV observations, obtained in August 1997, of the sdO star BD +28°4211 which is a secondary flux standard and of the central star of the planetary nebula NGC 246, a hot degenerate star which shows strong OV1 lines in the optical region. The UVSTAR spectrum of NGC 246 displays remarkable P Cygni profiles indicating a very fast stellar wind.

Conference title:
Place:

KeyWords: FUV spectroscopy; Planetary nebula; Stellar wind; UVSTAR

gdpr-image
This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more