The deep eclipse of NN Ser.

Details The deep eclipse of NN Ser. The deep eclipse of NN Ser.

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000msngr.100...42h&link_type=abstract

The Messenger, vol. 100, p. 42-44

Physics

2

Cataclysmic Binaries: Eclipsing Binaries

Scientific paper

The elusive nature of NN Ser was discovered in July 1988 (Häfner, 1989a, 1989b) in the course of a search for eclipses in faint cataclysmic variables using the CCD camera on the Danish 1.5-m telescope at La Silla. This target (V ~ 17), then named PG 1550+131 and thought to be such a variable, turned out to exhibit a sine-shaped light curve and a very deep eclipse of short duration repeating once every 3 hours and 7 minutes. Due to the low time resolution of the photometry (3.5 min), the duration of the eclipse (separated by half a period from maximum light) as well as its depth could only be roughly estimated to be about 12 min and at least 4.8 mag respectively. During mid-eclipse no signal from the object was recordable. Two spectra (resolution about 12 Å) obtained near maximum light (A) and near the onset of the eclipse (B) using EFOSC at the 3.6-m telescope revealed mainly narrow emission lines of the Balmer series superimposed on broad absorptions (A) and shallow Balmer absorptions without emission (B).

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