Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..481j&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 699, p. 481-485
Astronomy and Astrophysics
Astronomy
27
Dwarf Novae, Emission Spectra, H Lines, Mass Ratios, Periodic Variations, Spectral Line Width, Stellar Magnitude, Velocity Distribution, Astronomical Photometry, Astronomical Spectroscopy, Charge Coupled Devices, Light Curve
Scientific paper
Time-resolved spectroscopy of the dwarf nova BZ Ursae Majoris (BZ UMa) reveals periodic velocity variations in the hydrogen emission lines with P = 97.9 +/- 0.1 min and K = 73 +/- 6 km/s. CCD photometry over a 16-month interval shows three outbursts of about 4 mag with a mean separation of 181 days. The mean full width at half maximum (FWHM) for the hydrogen beta emission is large, prompting a recalibration of the FWHM/K vs. mass ratio relation, giving a mass ratio (MRD/MWD) of 0.20 for BZ UMa. The short period, long outburst interval, and small mass ratio support the suggestion of BZ UMa being in the SU Ursae Majoris subclass of dwarf novae.
Honeycutt Kent R.
Jurcevic John S.
Schlegel Eric M.
Webbink Ronald F.
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