Long-term spectroscopic monitoring of HD 160529

Details Long-term spectroscopic monitoring of HD 160529 Long-term spectroscopic monitoring of HD 160529

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8002g&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #80.02; Bulletin of the American Astronomical Society, Vol. 26, p.1446

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed the galactic Luminous Blue Variable HD 160529 at the ESO-50cm telescope with a fiber-linked echelle spectrograph in 3 observing runs from 1992 to 1994. In total 188 spectra were obtained with a S/N ~ 100 and a resolving power of lambda / Delta lambda ~20000 in the wavelength range 4050 Angstroms < lambda < 6800 Angstroms. In our 1992 survey we detected a sharp increase in the radial velocity curve of the HeIlambda5876 line (from about -13 km/s to -27 km/s) which could be explained by a shell-ejection. Simultaneously a peak in the visuell brightness is observed indicating a possible correlation of photometric and spectroscopic variations. At the same time the SiIIlambda6347 and FeIIlambda6248 lines show significant intensity variations in their red wings. The blue wings of these lines which originate further outside of the atmosphere at higher velocities are not influenced by this feature. The Hα line shows a strong P Cygni profile with no v_rad variations; only the variable intensity of the emission component reflects the density variations within the envelope which are caused by the ejected shell. The maximum radial velocity of about v_rad(max) ~ -185\ km/s was measured on the blue wing of the absorption component of Hα . A mass-loss rate of dot {M} ~ 10(-5) \ Msunyr(-1) was determined by fitting models to the Hα line profile. The sodium lines consisted of 3 absorption and 1 emission components at v_rad= -98, -68, -12, +34 \ km/s (measured at the line peaks). By comparing the NaD lines from Wolf et al. (1974), Sterken et al. (1991) and our observations we see similar v_rad values but strongly varying intensities.

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