Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213l..15h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. L15-L18.
Astronomy and Astrophysics
Astrophysics
29
Astronomical Photometry, Cataclysmic Variables, Eclipsing Binary Stars, Stellar Evolution, Light Curve, M Stars, Periodic Variations, Stellar Orbits, Visible Spectrum, White Dwarf Stars
Scientific paper
PG 1550+131 was discovered to be a binary with an orbital period of 3 h 07 min. The optical light curve (integral light) is characterized by the appearance of a strong heating effect (about 0.6 mag) and very deep primary eclipses (at least 4.8 mag) occurring half a period after maximum light. These eclipses are among the deepest if not actually the deepest ever recorded for a binary. No secondary eclipse is detectable. The optical spectrum near maximum light is dominated by narrow emissions of the Balmer series and by weak He I emissions, both disappearing near primary eclipse. A preliminary analysis shows that PG 1550+131 is a precataclysmic (still detached) binary probably consisting of an about 1800-K white dwarf or white dwarf precursor and an about 3000-K M dwarf.
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