Spectroscopic observations of the dwarf nova IP Pegasi

Abstract

view Abstract Citations (32) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopic Observations of the Dwarf Nova IP Pegasi Hessman, Frederic V. Abstract Time-resolved spectroscopic measurements of IP Peg were obtained immediately after a dwarf nova eruption. The radio-velocity amplitude of the white dwarf (118 + or - 10 km/s) implied by measurements from the wings of the Balmer emission lines is different from that found previously. The results suggest a mass ratio M1/M2 of 0.435 + or - 0.052 and that the narrow component is due to unusually strong chromospheric emission from the late-type star. The low value for the radial-velocity amplitude of this narrow emission (about 200 km/s) is consistent with the observed absorption-line amplitude of 331 km/s if the irradiated surface of the M dwarf produces little line absorption. Publication: The Astronomical Journal Pub Date: August 1989 DOI: 10.1086/115168 Bibcode: 1989AJ.....98..675H Keywords: Accretion Disks; Astronomical Spectroscopy; Cataclysmic Variables; Dwarf Novae; Balmer Series; Carbon; Chromosphere; Emission Spectra; Helium; Line Spectra; Nitrogen; Radial Velocity; Astrophysics; STARS: DWARF NOVAE; STARS: INDIVIDUAL full text sources ADS | data products SIMBAD (14)