New VIC photometry of the sdOB binary AA Dor and an improved photometric model
نویسندگان
چکیده
منابع مشابه
Aa Dor — an Eclipsing Sdob – Brown Dwarf Binary
AA Dor is an eclipsing, close, post common-envelope binary (PCEB) consisting of a sdOB primary star and an unseen secondary with an extraordinary small mass (M2 ≈ 0.066M⊙) – formally a brown dwarf. The brown dwarf may have been a former planet which survived a common envelope (CE) phase and has even gained mass. A recent determination of the components’ masses from results of NLTE spectral anal...
متن کاملThe rotational velocity of the sdOB primary of the eclipsing binary system LB 3459 ( AA Dor ) ⋆
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...
متن کاملNLTE 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...
متن کاملFUSE spectroscopy of sdOB primary of the post common - envelope binary LB 3459 ( AA Dor ) ⋆
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...
متن کاملThe mass ratio and the orbital parameters of the sdOB binary AA Doradus
The time sequence of 105 spectra covering one full orbital period of AA Dor has been analyzed. Direct determination of V sin i for the sdOB component from 97 spectra outside of the eclipse for the lines Mg II 4481 Å and Si IV 4089 Å clearly indicated a substantially smaller value than estimated before. Detailed modelling of line profile variations for 8 spectra during the eclipse for the Mg II ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06860.x