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Pregled bibliografske jedinice broj: 479896

Časopis

Autori: Fouqué, P.; ...; Dominis Prester, Dijana; ...; Seitz, S.
Naslov: OGLE 2008-BLG-290 : an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing
Izvornik: Astronomy and Astrophysics (0004-6361) 518 (2010); A51-1-A51-12
Vrsta rada: članak
Ključne riječi: gravitational lensing: micro; techniques: high angular; resolution; stars: atmospheres; stars: individual:; OGLE 2008-BLG-290
Sažetak:
Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczyński point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement of the respective limb-darkening coefficients. In the case of the microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification at about 100. Thirteen different telescopes have covered this event in eight different photometric bands. Subsequent light-curve analysis yielded measurements of linear limb-darkening coefficients of the source in six photometric bands. The best-measured coefficients lead to an estimate of the source effective temperature of about 4700+100-200 K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200 ± 100 K. Because the limb-darkening measurements, at least in the CTIO/SMARTS2 V_s- and I_s-bands, are among the most accurate obtained, the above disagreement needs to be understood. A solution is proposed, which may apply to previous events where such a discrepancy also appeared.
Projekt / tema: 316-0000000-2824
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://adsabs.harvard.edu/abs/2010A%26A...518A..51F
URL cjelovitog teksta:
Google Scholar: OGLE 2008-BLG-290 : an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing
Upisao u CROSBI: dijana@uniri.hr (dijana@uniri.hr), 6. Ruj. 2010. u 04:49 sati



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