4. Trigonometrical Parallaxes of LB 3303 and LB 3459
نویسندگان
چکیده
منابع مشابه
NLTE spectral analysis of the sdOB primary of the eclipsing binary system LB 3459 (AA Dor)
We present a spectral analysis of the sdOB primary star of the binary system LB 3459 based on high-resolution highS/N optical and UV spectra. The metal abundances are determined by means of state-of-the-art NLTE model atmospheres. We determined Teff =42kK and log g =5.2 within very small error limits. The He (1/125 solar), C (1/265), N (1/33), O (1/12), and Si (1/5) abundances appear strongly d...
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Context. LB 3459 (AA Dor) is an eclipsing, close, post common-envelope binary (PCEB) consisting of an sdOB primary star and an unseen secondary with an extraordinarily low mass (M2 ≈ 0.066 M⊙) – formally a brown dwarf. A recent NLTE spectral analysis shows a discrepancy with the surface gravity, which is derived from analyses of radial-velocity and lightcurves. Aims. We aim at precisely determi...
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We present an analysis of the rotational velocity of the primary of LB 3459 based on 107 new high-resolution and high-S/N ESO VLT UVES spectra. 105 of them cover a complete orbital period (0.26 d) of this binary system. We have determined an orbital period of P = 22 600.702 ± 0.005 sec, a radial velocity amplitude of A 1 = 39.19 ± 0.05 km/sec, and T 0 = 2451917.152690 ± 0.000005. From simulatio...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1971
ISSN: 0074-1809
DOI: 10.1017/s0074180900097035