2008A&A...482..259C


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET11:00:50

2008A&A...482..259C - Astronomy and Astrophysics, volume 482, 259-266 (2008/4-4)

Testing the limb-darkening coefficients measured from eclipsing binaries.

CLARET A.

Abstract (from CDS):

The numerical methods used to compute limb-darkening coefficients (LDCs) are still a matter of discussion. To improve this scenario, we have revised our earlier calculations and compare the new LDCs with previous theoretical ones, as well as with empirical values measured from eclipsing binaries. We present new LDCs, based on the least-squares method but computed with higher numerical resolution (100 µ points instead of 11). The LDCs are computed for the following photometric bands: Johnson-Cousins, Stroemgren, Geneva, and Walraven systems. Bolometric and monochromatic calculations are also available on request. The computations are presented for 19 metallicities ranging from 10–5 up to 10+1 times the solar abundance, with logg values between 0.0 and 5.0, effective temperatures between 2000K and 50000K, and microturbulent velocities from 0km/s to 8km/s. The new theoretical LDCs provide better fits to the calculated specific intensities than those derived by adopting the r-integration. The improvement is approximately one order of magnitude. When compared with empirical linear LDCs measured for nine eclipsing binaries, it was not possible to distinguish our results from those provided by the r-integration method. However, this comparison also reveals that the theoretical atmosphere models are unable to give a satisfactory fit to the observations. This result is supported by a recent investigation of transiting extrasolar planets. These discrepancies may also be related to problems with the empirical LDC values themselves.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stellar: atmospheres

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * mu. Cas SB* 01 08 16.39470 +54 55 13.2264 5.93 5.86 5.17 4.55 4.13 G5Vb 549 1
2 V* V459 Cas Al* 01 11 29.9133783181 +61 08 48.056142164   10.55 10.36     A2 69 0
3 V* WW Cam Al* 04 31 25.2823769221 +64 21 45.496920856   10.61 10.09     A5 55 0
4 V* GG Ori Al* 05 43 10.2225202776 -00 41 14.794297965   10.92       A2 70 0
5 * bet Aur Al* 05 59 31.7229284 +44 56 50.757259 1.97 1.93 1.90 1.82 1.83 A1IV-Vp 405 0
6 V* WW Aur Al* 06 32 27.1844547414 +32 27 17.633031158   6.005 5.829     ~ 239 0
7 V* BS Dra Al* 19 56 28.7704782049 +73 36 57.518195948   9.58 9.14     F5 79 0
8 V* EE Peg Al* 21 40 01.8784962647 +09 11 05.116891931   7.09 6.98     A1III 162 0
9 V* RW Lac Al* 22 44 57.1032069864 +49 39 27.511213337   11.23 10.81     F2 68 0

    Equat.    Gal    SGal    Ecl

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2021.01.27-11:00:50

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