Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..769b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Dec. 1981, p. 769-771.
Astronomy and Astrophysics
Astronomy
9
Eclipsing Binary Stars, Emission Spectra, Spectrograms, Stellar Atmospheres, Stellar Mass, Stellar Spectra, Line Spectra, Main Sequence Stars, Nebulae, Orbital Elements, Sagittarius Constellation, Stellar Spectrophotometry
Scientific paper
High dispersion spectrograms obtained in 1980 and 1981 confirm earlier reports (McLaughlin et al., 1952) that the star HD 187076/7 or delta-Sagittae, a system of the zeta-Aur type, undergoes atmospheric eclipses approximately every 3725 days. Reimers and Kudritzki (1980) demonstrated the possibility of determining the individual masses in the system. The observed mass-function of 0.139 is adopted, and a high orbital inclination (70 deg) is assumed. If the B7 star is a main-sequence object, its mass is close to 4 solar mass (Popper, 1980); this also implies a mass of 15.5 solar mass for the M star. Double-peaked emission lines were also found, and are attributed to a disk surrounding the early-type component. This, along with reflection nebulosity around the star, tends to complicate photometry, making it more difficult to detect a marginal eclipse.
Batten Alan H.
Fisher Wesley A.
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