EX Hydrae in outburst

Details EX Hydrae in outburst EX Hydrae in outburst

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238.1107h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 1, 1989, p. 1107-1119. Research supported by

Astronomy and Astrophysics

Astronomy

65

Binary Stars, Red Dwarf Stars, Stellar Mass Accretion, Stellar Spectrophotometry, White Dwarf Stars, H Alpha Line, Light Curve, Magnetic Stars, Spectral Line Width, Stellar Magnetospheres

Scientific paper

Photometry and red spectroscopy of the intermediate polar EX Hya in its rare outburst state are presented. Photometry during the declining phase of the July-August 1986 outburst shows the 67-min (spin) modulation to be present with similar characteristics to that in quiescence. In contrast, photometry from near the peak of the 1987 May outburst shows little evidence of the 67-min modulation, while spectroscopy obtained nearly simultaneously is similarly lacking in such evidence, despite its presence in quiescent spectroscopic data. Near the beginning of the May 1987 outburst the H alpha emission line develops a broad, high velocity base component whose velocity is modulated with the orbital cycle. The velocity and phase of the broad base component suggest that it is produced near the magnetosphere of the white dwarf at a point along the projected trajectory of the gas stream from the companion. The feature disappears later in the outburst and is not present during quiescence. It is suggested that the outbursts in EX Hya are caused by an increase in the rate of mass transfer from the companion, and that part of this enhanced mass-transfer stream skims over the top of the accretion disk to strike the magnetosphere directly. The interaction of the stream with the magnetosphere gives rise to the broad-base component observed.

Affiliated with

Also associated with

No associations

Rating

EX Hydrae in outburst does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with EX Hydrae in outburst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and EX Hydrae in outburst will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1855915