Spectroscopic and Photometric Observations of a Z Cam-Type Dwarf Nova, AT Cancri, in Standstill

Details Spectroscopic and Photometric Observations of a Z Cam-Type Dwarf Nova, AT Cancri, in Standstill Spectroscopic and Photometric Observations of a Z Cam-Type Dwarf Nova, AT Cancri, in Standstill

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..115n&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.115-125.

Astronomy and Astrophysics

Astronomy

11

Accretion, Accretion Disks, Stars: Cataclysmic, Stars: Dwarf Novae, Stars: Individual (At Cancri)

Scientific paper

We performed quasi-simultaneous spectroscopic and photometric observations of a Z Cam star, AT Cnc, in standstill in 1997 February. V-band time-resolved photometry marginally revealed small-amplitude ( ~ 0.01 mag) oscillations with period candidates of 0.132 d, 0.124 d, 0.142 d, and 0.249 d. Low-resolution spectra show Balmer lines in emission and absorption, and Na D absorption. From the radial-velocity variation of Hα , we deduced the system parameters: the orbital period = 0.2011 (+/- 0.0006) d, the semi-amplitude = 80 (+/- 4) km s^{{-1}} , the systemic velocity = 11 (+/- 3) km s^{{-1}} , the primary mass = 0.9 (+/- 0.5) MO . The phase of the velocity variation of Hα is very close to that of Na D. There are two possibilities: the Hα emission line radiated (a) from the secondary star, or (b) from the accretion disk. The inclination is estimated to be 17^° (+/- 5^° ) and 36^° (+/- 12^° ) based on the respective possibilities. Doppler map drawn under possibility (a) revealed on a broadly extended component in the (-V_x, -V_y) region. In the Doppler map drawn under the possibility (b), the peak exists on the irradiated side of the Doppler position of the secondary and the (+V_x, +V_y) region. We discovered an absorption component in the blue wing at Hα . The P Cyg profile appeared during a limited period in its orbital phase, which is interpreted to be caused by transient mass ejection episodes.

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