Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...61h&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 3, p. 61-64
Astronomy and Astrophysics
Astronomy
Data Reduction, Galactic Halos, Ionized Gases, Magellanic Clouds, Spatial Distribution, Absorption Spectra, Discovery (Orbiter), High Resolution, Line Spectra, Ultraviolet Astronomy, Ultraviolet Spectrometers, Ultraviolet Telescopes
Scientific paper
We present high resolution (lambda/delta lambda = 3000) observations of the Small Magellanic Cloud (SMC) star NGC 346 #1 near the O VI resonance doublet (1031.9, 1037.6 A). The data were collected with the Berkeley extreme/far ultraviolet (EUV/FUV) spectrometer in the ORFEUS telescope aboard the space platform Astro-SPAS during the missiom of space shuttle Discovery flown in September 1993. The O VI features shows broad absorption centered near nuLSR is approximately equal to +140 km/sec. This is almost certainly associated with the OB cluster NGC 346 itself, which also shows deep absorption at Si IV and C IV at comparable velocities. An absorption feature corresponding to O VI near nuLSR = -230 km/sec is present in our data, but this feature is caused by contamination from a second star, probably an early B-type main sequence star at lower standard of rest (LSR) velocity, which is also present in the 20 min circular aperture. Between these velocity extrema lies one broad feature (b is approximately equal 70 km/sec) or multiple narrower features, with a combined column density of about 1.4 x 1014/sq cm. Assuming an exponential distribution of O VI with the in-plane density of Jenkins, we infer a scale height, H0, of no more than approximately equal 1.2 kpc toward NGC 346 #1. Our O VI column density is about a factor of 4 below the predictions of cooling fountain models, but our low scale height is consistent with more recent predictions.
Bowyer Stuart
Hurwitz Margaret M.
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