Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97.1115t&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Nov. 1985, p. 1115-1118. Sponsorship: Ministry of E
Astronomy and Astrophysics
Astronomy
5
Binary Stars, Emission Spectra, H Gamma Line, Infrared Astronomy, Spectral Line Width, Stellar Spectra, H Alpha Line, Nebulae, Radial Velocity, Stellar Winds, Wind Velocity
Scientific paper
The B-gamma line emission of MWC349 was observed in May 1984 with a velocity resolution of 25 km/s. The spectrum shows two distinct emission components. The main component has a FWHM of 115 km/s at V(LSR) = 5/km/s. The observed line profile is well reproduced with a model in which the B-gamma emission arises from a stellar wind with a constant velocity of 55 km/s. However, the profile shows a slight asymmetry. Comparisons of the observed profile with theoretical ones suggests blue-shifted absorption dip which might be produced in an outer decelerated region or in an expanding disk. The subcomponent was first detected and has a FWZI of 80 km/s at V(LSR) = -260 km/s with a relative intensity of 4 percent compared to the main component. The H-alpha spectrum also obtained in May 1984 shows a weak component at the same velocity. The corresponding feature was not seen in the early H-alpha spectrum observed in June 1979 by Hartmann, Jaffe, and Huchra (1980).
Nishida Munehiro
Okuda Haruyuki
Sato Sasumu
Tanaka Masao
Ukita Naoya
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