Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203..117p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 1, Sept. 1988, p. 117-122.
Astronomy and Astrophysics
Astronomy
25
Hot Stars, Iue, Supergiant Stars, Ultraviolet Astronomy, Absorption Spectra, F Stars, Infrared Astronomy Satellite, Planetary Nebulae, Stellar Temperature
Scientific paper
Low resolution (6 A) IUE ultraviolet spectra of the high galactic latitude F supergiants HD 161796 (F3 Ib) and HD 187885 (F2-3I) are analyzed. The UV spectrum (1250 A to 3250 A) of HD 161796 shows no excess UV flux attributable to a hot degenerate companion. From the UV spectrum the temperature is found to be 6300 K. There is no evidence for significant metal deficiency. Except for the semiforbidden N IV 1487 A line the rest of the transition region emission lines are weak. In spite of the large IR (IRAS) excess, the 2200 A region shows no evidence for circumstellar reddening. The UV spectrum (1250 A to 1900 A) of HD 187885 is peculiar. A broad emission feature with emission peak centered around 1580 A is present. A broad absorption feature nearly 100 A wide centered around 1657 A appears to be present. This absorption feature may be due to C I or due to quasi-molecular absorption of the H2.
Parthasarathy Mudumba
Pottasch Stuart R.
Wamsteker Willelm
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