Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...94..569l&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 94, no. 3, Sept. 1992, p. 569-586. Research supported by SER
Astronomy and Astrophysics
Astrophysics
65
Astronomical Maps, B Stars, O Stars, Stellar Luminosity, Stellar Spectrophotometry, Stellar Winds, Supergiant Stars, Charge Coupled Devices, Early Stars, Emission Spectra, Hydrogen, Nitrogen, Signal To Noise Ratios
Scientific paper
CCD spectra are presented for supergiants of spectral types O9-B9 and luminosity subclasses Ia and Ib. They cover the wavelength region from approximately 3950 A to 4950 A at a resolution of 0.8 A, and normally have a signal-to-noise in excess of 150 at 4600 A. The spectra are discussed in respect to their classification. A number of stars show clear evidence of the 'filling in' of hydrogen lines by emission from the stellar wind, while HD 190603, a B1.5 Ia(+) hypergiant, exhibits an H-beta P-Cygni type line-profile. Also reported is the finding of a new nitrogen weak star, HD 13866, in the Per OB1 association which is classified here as BC2 Ib.
Dufton Philip L.
Fitzsimmons Alan
Lennon Daniel J.
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