Time-resolved optical spectroscopy of IR GEM in quiescence

Details Time-resolved optical spectroscopy of IR GEM in quiescence Time-resolved optical spectroscopy of IR GEM in quiescence

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..196l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 196-200.

Astronomy and Astrophysics

Astronomy

1

Accretion Disks, Dwarf Novae, Stellar Spectrophotometry, Balmer Series, H Alpha Line, Spectral Line Width, Stellar Mass Accretion, Stellar Spectra

Scientific paper

Spectroscopic observations of the dwarf nova IR Gem in the range 4000-7000 A, covering a whole orbital period, are presented. The dates of the observations (February 3-6, 1987) were at the end of the decline from an outburst and the beginning of quiescence. Evidence of phase related variations in H-alpha equivalent width is found, showing a maximum at phase 0.5. The mean quiescence spectra are compared with published accretion disk models, deriving a mass transfer rate for the system of about 10 to the -10th solar mass/yr, but it is shown that these models do not reproduce satisfactorily the observed spectra.

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