Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9423330.&link_type=abstract
Final Report Hughes STX, Inc., Greenbelt, MD.
Astronomy and Astrophysics
Astronomy
Globular Clusters, Hot Stars, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Background Radiation, Stellar Luminosity, Ultraviolet Spectrometers
Scientific paper
The objectives of this task are to direct and analyze the observations of globular clusters targets observed with the ultraviolet spectrometer on the Voyager spacecraft. The data analysis will be directed toward understanding the Voyager spectra or upper limits in terms of the expected properties of the hot stars in the globular clusters. One out of the four proposed targets was observed before the Voyager guest observer program was cancelled in early 1993. The observed target, NGC 6397, showed a spectrum characteristic of hot stars. However, further analysis showed that most of this emission was unlikely to be due to the hot post asymptotic giant branch cluster member ROB 162, and was probably due to dust-scattered light from unrelated foreground stars. Three types of analysis were performed to test the origin of the Voyager spectrum. First, the flux variations during the limit-cycle motion of the spacecraft motion were binned as a function of time; these showed no evidence of a point source response. Second, the Voyager spectrum were compared with an IUE spectrum of ROB 162; this showed that the Voyager flux was three times larger than could be explained from this star alone. Finally, a Voyager background observation taken 26 arcminutes from the cluster center was analyzed; this showed that the observed spectrum intensity did not diminish as the Voyager aperture was moved away from the globular cluster center.
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