1997A&A...318..841C


Query : 1997A&A...318..841C

1997A&A...318..841C - Astronomy and Astrophysics, volume 318, 841-869 (1997/2-3)

Notes on the convection in the ATLAS9 model atmospheres.

CASTELLI F., GRATTON R.G. and KURUCZ R.L.

Abstract (from CDS):

The mixing-length theory for the convection, as it is used in the ATLAS9 code (Kurucz, 1993a), is summarized and discussed. We investigated the effect of the modification called ``approximate overshooting'' on the model structure of the Sun and of stars with Teff included between 4000K and 8500K, logg included between 2.5 and 4.5, and metallicities [M/H]=0.0 and [M/H]=-3.0. We found that the Kurucz solar model (SUNK94) with the ``overshooting'' option switched on reproduces more observations than that without ``overshooting''. In the Hγ and Hβ regions no solar model is able to reproduce the level of the true continuum deduced from high-resolution observations absolutely calibrated. At 486 nm the computed continuum is about 6.6% higher than that inferred from the observed spectrum. We found that the largest effect of the ``approximate overshooting'' on the model structure occurs for models with Teff>6250K and it decreases with decreasing gravity. The differences in (b-y), (B-V), and (V-K) indices computed from models with the ``overshooting'' option switched on and off, correspond to Teff differences which may amount up to 180K, 100K, 60K respectively. The differences in Teff from Balmer profiles may amount up to 340K and they occur also for Teff<6250K down to about 5000K. The c1 index yields gravity differences {DELTA}logg as a function of logg which, for each Teff, grow to a maximum value. The maximum {DELTA}logg decreases with increasing temperatures and ranges, for solar metallicity, from 0.7 dex at logg=0.5 and Teff=5500K to 0.2dex at logg=4.5 and Teff=8000K. This behaviour does not change for [M/H]=-3.0. Comparisons with the observations indicate that model parameters derived with different methods are more consistent when the ``overshooting'' option is switched off (NOVER models), except for the Sun. In particular for Procyon, Teff and logg from NOVER models are closer to the parameters derived from model independent methods than are Teff and logg derived from the Kurucz (1995) grids. However, no model is able to explain the whole observed spectrum of either the Sun or Procyon with a unique Teff, regardless of whether the ``overshooting'' option is switched on or off. Independently of the convection option, the largest differences in Teff derived with different methods are of the order of 200K for Procyon and 150K for the Sun.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: fundamental parameters - stars: individual: Procyon - Sun: general - convection

Errata: vol. 324, p. 432

Simbad objects: 73

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Number of rows : 73
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * bet Cas dS* 00 09 10.68518 +59 08 59.2120 2.73 2.61 2.27 1.97 1.77 F2III 508 0
2 * del And SB* 00 39 19.6751809 +30 51 39.678320 6.04 4.56 3.28 2.36 1.70 K3III-IIIbCN0.5 321 0
3 * eta Cas PM* 00 49 06.2945942922 +57 48 54.638239716 4.04 4.02 3.44 2.94 2.58 F9V 617 0
4 * mu. And PM* 00 56 45.2121113 +38 29 57.638044 4.14 3.99 3.87 3.72 3.64 A6V 213 0
5 * tet Cas PM* 01 11 06.1622468 +55 08 59.647259 4.630 4.510 4.330 4.16 4.09 A7V 192 0
6 * ups And PM* 01 36 47.8415443907 +41 24 19.651368029 4.70 4.64 4.10 3.64 3.35 F9V 917 1
7 * ups Per PM* 01 37 59.5569926 +48 37 41.569533 6.29 4.85 3.57 2.61 1.96 K3-IIICN0.5 225 0
8 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1170 1
9 * alf Tri SB* 01 53 04.9070960 +29 34 43.780094 3.96 3.90 3.42 3.00 2.72 F5III 280 0
10 BD+29 366 PM* 02 10 24.5274364299 +29 48 23.663397433 9.27 9.35 8.77 8.24 7.85 G3 130 0
11 HD 19445 PM* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 752 0
12 * iot Per PM* 03 09 04.0193012009 +49 36 47.802053343 4.76 4.64   3.7   G0V 524 0
13 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 848 0
14 * 10 Tau PM* 03 36 52.3837044168 +00 24 05.992097829 5.23 5.15 4.30 4.09 3.77 F9IV-V 541 0
15 * omi02 Eri Er* 04 15 16.3196189945 -07 39 10.330779018 5.69 5.25 4.43 3.74 3.29 K0V 774 0
16 * del02 Tau PM* 04 24 05.7614531616 +17 26 38.871301956 5.07 4.95 4.80 4.64 4.57 A2Vs 228 0
17 * 15 Ori ** 05 09 41.9571460296 +15 35 49.966969920 5.33 5.14 4.82 4.50 4.31 F2IV 108 0
18 * lam Aur PM* 05 19 08.4754499121 +40 05 56.585080940 5.46 5.33 4.71 4.18 3.86 G1.5IV-VFe-1 509 0
19 * phi02 Ori PM* 05 36 54.3885728561 +09 17 26.416510827 5.70 5.04 4.09 3.33 2.78 G9.5IIIbFe-2.5 350 0
20 * d Ori SB* 05 38 53.0831846256 -07 12 46.187179740 5.04 4.93 4.80 4.65 4.59 A4Vn 132 1
21 * del Aur SB* 05 59 31.6184193950 +54 17 05.056666306 5.580 4.730 3.720 2.95 2.45 K0IIIb 184 0
22 BD+37 1458 PM* 06 16 01.5222885381 +37 43 18.754343426 9.41 9.52 8.92 8.34 7.91 G0 131 0
23 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 435 0
24 * tet Gem PM* 06 52 47.3388710 +33 57 40.517462 3.84 3.70 3.60 3.50 3.42 A2IV 132 0
25 * del CMa s*y 07 08 23.4840514 -26 23 35.518484 3.06 2.52 1.84 1.33 1.00 F8Ia 331 0
26 * omi Gem PM* 07 39 09.9346623336 +34 35 03.502791096 5.41 5.30 4.90 4.51 4.29 F3III 103 0
27 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1818 0
28 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1075 1
29 HD 64090 PM* 07 53 33.1208795337 +30 36 18.256204963 8.75 8.86 8.25 7.70 7.30 K0:V_Fe-3 351 0
30 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 527 1
31 * g UMa ** 13 25 13.5378333 +54 59 16.654781 4.260 4.180 4.010 3.85 3.78 A5V+M3-4V 299 0
32 * 70 Vir PM* 13 28 25.8085908881 +13 46 43.638308807 5.930 5.680 4.970 4.37 3.98 G4Va 694 1
33 * zet Vir PM* 13 34 41.5913587272 -00 35 44.939098032 3.58 3.50 3.38 3.31 3.25 A2Van 189 0
34 * tau Boo Ro* 13 47 15.7381720026 +17 27 24.809555600 5.02 4.98 4.49 4.09 3.85 F7IV-V 937 1
35 * eta Boo SB* 13 54 41.07892 +18 23 51.7946 3.440 3.250 2.680 2.24 1.95 G0IV 681 1
36 * d Boo SB* 14 10 23.9334932664 +25 05 30.037020972 5.44 5.37 4.83 4.39 4.10 F8V 167 0
37 * iot Vir PM* 14 16 00.8695049 -06 00 01.963348 4.64 4.60 4.08     F7III 348 0
38 * iot Boo dS* 14 16 09.9297628080 +51 22 02.028703692 5.01 4.95 4.75 4.60 4.51 A7V 158 1
39 * rho Boo PM* 14 31 49.7893292450 +30 22 17.171652275 6.33 4.89 3.59 2.67 2.02 K3-III 251 0
40 * sig Boo PM* 14 34 40.8173867232 +29 44 42.457673940 4.76 4.84 4.47 4.13 3.94 F4VkF2mF1 587 0
41 * mu. Vir PM* 14 43 03.6228218 -05 39 29.532712 4.25 4.26 3.88 3.48 3.26 F2V 219 0
42 * 16 Lib PM* 14 57 10.9988855472 -04 20 47.251261752 4.86 4.81 4.49 4.17 4.00 F2V 123 0
43 * bet Boo Er* 15 01 56.7623786 +40 23 26.040607 5.21 4.47 3.52 2.85 2.37 G8IIIaFe-0.5 246 0
44 * c Boo PM* 15 07 18.0659348352 +24 52 09.099406380 5.34 5.36 4.93 4.53 4.32 F5V 346 0
45 * del Boo PM* 15 15 30.1629518 +33 18 53.392558 5.12 4.44 3.49 2.76 2.25 G8IIIFe-1 367 0
46 * tet Dra SB* 16 01 53.3463580 +58 33 54.905636 4.630 4.520 4.000 3.56 3.31 F9V 286 0
47 * gam Her ** 16 21 55.2144050 +19 09 11.261793 4.22 4.03 3.76 3.47 3.33 A9IIIbn 172 0
48 * eta Dra PM* 16 23 59.4863284800 +61 30 51.155139060 4.35 3.65 2.74 2.12 1.66 G8-IIIab 286 0
49 * 47 Oph SB* 17 26 37.8809423 -05 05 11.749992 4.90 4.93 4.54 4.16 3.95 F3V 154 0
50 * alf Oph ** 17 34 56.06945 +12 33 36.1346 2.32 2.22 2.07 1.93 1.85 A5IVnn 459 0
51 * mu.01 Her ** 17 46 27.5472960785 +27 43 14.560978925 4.56 4.17 3.42 2.89 2.51 G5IV 675 0
52 * ksi Her LP* 17 57 45.8857114 +29 14 52.367509 5.34 4.64 3.70 3.01 2.55 G8.5III 231 0
53 * 72 Oph PM* 18 07 20.9839294 +09 33 49.850100 3.95 3.85 3.73 3.59 3.54 A5V 139 0
54 * 110 Her PM* 18 45 39.7256792847 +20 32 46.713086264 4.66 4.65 4.19 3.80 3.54 F5.5IV-V 395 0
55 * tet Cyg PM* 19 36 26.5343563 +50 13 15.964573 4.83 4.86 4.48 4.13 3.92 F3+V 338 1
56 * alf Sge * 19 40 05.7913315848 +18 00 50.006621484 5.59 5.16 4.38 3.79 3.40 G1II 202 0
57 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 847 0
58 * bet Aql PM* 19 55 18.7928429719 +06 24 24.351242346 5.040 4.560 3.710 3.05 2.56 G8IV 534 0
59 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 293 0
60 * eta Cep PM* 20 45 17.3755540 +61 50 19.616737 4.960 4.320 3.410 2.76 2.27 K0IV 429 0
61 * eps Cyg ** 20 46 12.6823609 +33 58 12.924926 4.370 3.520 2.480 1.73 1.19 K0III 492 0
62 * sig Oct dS* 21 08 46.8635701992 -88 57 23.398330572   5.74 5.42     F0IV 57 0
63 HD 201891 PM* 21 11 59.0321495469 +17 43 39.890919730 7.74 7.88 7.37 6.91 6.59 G5V_Fe-2.5 377 0
64 * del Equ SB* 21 14 28.8153077 +10 00 25.125878 4.98 4.99 4.49 4.06 3.78 F7(V)+G0(V) 314 0
65 * 72 Cyg PM* 21 34 46.5868653816 +38 32 02.640439968 6.99 5.99 4.91 4.09 3.55 K0.5IIIFe0.5 177 0
66 * alf Aqr * 22 05 47.0359315 -00 19 11.456766 4.65 3.90 2.94 2.27 1.76 G2Ib 428 0
67 * tet Aqr PM* 22 16 50.0366846016 -07 46 59.839473115 5.95 5.15 4.16 3.46 2.98 G9II 138 0
68 * 35 Peg PM* 22 27 51.5231162634 +04 41 44.404460456 6.74 5.86 4.80 4.02 3.46 K1-III-IV 261 0
69 * ksi Peg PM* 22 46 41.5798542334 +12 10 22.388860108 4.66 4.69 4.20 3.73 3.42 F6V 373 0
70 * mu. Peg PM* 22 50 00.1931506 +24 36 05.698380 5.10 4.42 3.48 2.80 2.33 G8+III 284 0
71 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1179 3
72 * 7 And PM* 23 12 33.0037993 +49 24 22.345507 4.85 4.81 4.52 4.23 4.07 F1V 149 0
73 * ups Peg PM* 23 25 22.7828725585 +23 24 14.762916815 5.15 5.01 4.40 3.86 3.54 F8III 247 0

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2022.05.20-07:16:20

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