Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104.1054s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 681, p. 1054-1059.
Astronomy and Astrophysics
Astronomy
4
Emission Spectra, Nitrogen, Spectral Line Width, Stellar Radiation, Supergiant Stars, Calibrating, Radial Velocity
Scientific paper
McDonald spectra of HR 8752 from the last 16 years reveal a constant radial velocity and a variable equivalent width of the forbidden N II emission at 6583 A. The 1976-1991 interval confirms and expands the increasing equivalent width trend first reported in Sheffer and Lambert (1987). The current equivalent width of 230 mA is the strongest forbidden N II emission ever observed from HR 8752. By analyzing published B and V photometry we establish that the cause of forbidden N II equivalent width variability is the variable continuum of HR 8752. Extension of the analyzed interval back to the 1961 discovery epoch is accomplished by a survey of both the spectroscopic and photometric literature. This uncovers a remarkable minimum in forbiden N II strength around 1973 and possibly demonstrates a cyclical behavior of the continuum with a 30-yr period, or longer.
Lambert David L.
Sheffer Yaron
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