U, B, V photometry and spectroscopy of HM Sagittae in 1978

Details U, B, V photometry and spectroscopy of HM Sagittae in 1978 U, B, V photometry and spectroscopy of HM Sagittae in 1978

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sval....5..349b&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 5, Dec. 1979, p. 653-657.) Soviet Astronomy Letters, vol. 5, Nov.-Dec. 1979, p. 349-351

Astronomy and Astrophysics

Astronomy

4

Emission Spectra, Stellar Spectrophotometry, Ubv Spectra, Visual Photometry, Forbidden Bands, Hydrogen, Light Curve, Oxygen Spectra, Ultraviolet Photometry

Scientific paper

During 1978 the peculiar object HM Sge faded gradually in all the U, B, V bands; the mean B-V color index increased somewhat, while U-B was slightly smaller than in 1977. Rapid light fluctuations of up to 0.1m amplitude again occurred, lasting about a day. Several forbidden lines were significantly enhanced relative to the hydrogen emission lines. High-dispersion coude spectrograms show that different hydrogen lines have similar profiles, implying that their great width (plus or minus 2000 km/sec) is due to the Doppler effect.

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