Knowledge

Convection zone

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20: 2661: 1144: 36: 2672: 166:(i.e. its temperature changes relatively slowly as it expands) then the rising parcel of gas will remain warmer and less dense than its new surroundings even after expanding and cooling. Its buoyancy will then cause it to continue to rise. The region of the star in which this happens is the convection zone. 154:
expresses the conditions under which a region of a star is unstable to convection. A parcel of gas that rises slightly will find itself in an environment of lower pressure than the one it came from. As a result, the parcel will expand and cool. If the rising parcel cools to a lower temperature than
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due to heavier elements to be high enough to produce a steep temperature gradient. This combination of circumstances produces an outer convection zone, the top of which is visible in the Sun as
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Stellar convection consists of mass movement of plasma within the star which usually forms a circular convection current with the heated plasma ascending and the cooled plasma descending.
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its new surroundings, so that it has a higher density than the surrounding gas, then its lack of buoyancy will cause it to sink back to where it came from. However, if the
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that is in thermal equilibrium and undergoes little or no mixing. In the most massive stars, the convection zone may reach all the way from the core to the surface.
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In main sequence stars similar to the Sun, which have a radiative core and convective envelope, the transition region between the convection zone and the
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Lebzelter, T.; Lederer, M. T.; Cristallo, S.; Hinkle, K. H.; Straniero, O.; Aringer, B. (2008). "AGB stars of the intermediate-age LMC cluster NGC 1846".
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Martins, F.; Depagne, E.; Russeil, D.; Mahy, L. (2013). "Evidence of quasi-chemically homogeneous evolution of massive stars up to solar metallicity".
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is steep enough (i.e. the temperature changes rapidly with distance from the center of the star), or if the gas has a very high
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In main sequence stars of less than about 1.3 solar masses, the outer envelope of the star contains a region where partial
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Reiners, Ansgar; Basri, Gibor (March 2009). "On the magnetic topology of partially and fully convective stars".
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events, short-lived very deep convection zones that transport fusion products to the surface of the star.
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d'Antona, F.; Montalbán, J. (2003). "Efficiency of convection and Pre-Main Sequence lithium depletion".
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phase, the surface convection zone varies in depth during the phases of shell burning. This causes
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star, showing their convective zones. These are the granular zones in the outer layers of the stars.
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raises the heat capacity. The relatively low temperature in this region simultaneously causes the
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is a layer which is unstable due to convection. Energy is primarily or partially transported by
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Behrend, R.; Maeder, A. (2001). "Formation of massive stars by growing accretion rate".
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Animated explanation of the temperature and density of the Convection zone
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more than 1.3 times the mass of the Sun, the high core temperature causes
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Hansen, Carl J.; Kawaler, Steven D. & Trimble, Virginia (1994).
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Stellar Interiors: physical principles, structure and evolution
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Region of a star which is unstable due to convection
176:Radiation zone § Stability against convection 2689: 1174: 648: 581:Zeilik, Michael; Gregory, Stephen A. (1998). 580: 290: 396: 239:, as well as pre-main sequence stars on the 607:Animated explanation of the Convection zone 390: 1181: 1167: 655: 641: 200:instead of the less temperature-sensitive 516: 463: 410: 357: 304: 585:(4th ed.). Australia: Brooks/Cole. 39:An illustration of the structure of the 34: 23:An illustration of the structure of the 18: 583:Introductory astronomy and astrophysics 2690: 231:Low-mass main-sequence stars, such as 169: 1162: 636: 443: 13: 553: 198:carbon-nitrogen-oxygen (CNO) cycle 14: 2714: 600: 2670: 2660: 2659: 1143: 1142: 196:to occur predominantly via the 496: 337: 284: 266:, and particularly during the 1: 2572:Timeline of stellar astronomy 1125:List of heliophysics missions 277: 257: 1130:Category:Missions to the Sun 629:(University of South Wales). 616:(University of South Wales). 346:Astronomy & Astrophysics 7: 2232:Hertzsprung–Russell diagram 662: 535:10.1051/0004-6361:200809363 429:10.1051/0004-6361:200811450 376:10.1051/0004-6361/201321282 136:, energy is transported by 10: 2719: 2146:Kelvin–Helmholtz mechanism 505:Astronomy and Astrophysics 482:10.1051/0004-6361:20031410 452:Astronomy and Astrophysics 399:Astronomy and Astrophysics 323:10.1051/0004-6361:20010585 293:Astronomy and Astrophysics 173: 2655: 2580: 2429: 2327: 2255: 2154: 2011: 1886: 1764: 1673: 1409: 1400: 1279: 1209: 1196: 1188: 1138: 1112: 1106:G-type main-sequence star 1098: 956: 918: 853: 791: 763: 725: 716: 683: 670: 2525:With multiple exoplanets 969:In mythology and culture 1311:Asymptotic giant branch 527:2008A&A...486..511L 474:2003A&A...412..213D 421:2009A&A...496..787R 368:2013A&A...554A..23M 315:2001A&A...373..190B 268:asymptotic giant branch 152:Schwarzschild criterion 132:in such a region. In a 2647:Tidal disruption event 2136:Circumstellar envelope 1370:Luminous blue variable 836:Supra-arcade downflows 109: 32: 2172:Effective temperature 816:Coronal mass ejection 38: 22: 2642:Planet-hosting stars 2520:With resolved images 2491:Historical brightest 2421:Photometric-standard 2347:Solar radio emission 2141:Eddington luminosity 1921:Triple-alpha process 1859:Thorne–Żytkow object 1234:Young stellar object 1080:Standard solar model 1050:Solar radio emission 868:List of solar cycles 2466:Highest temperature 2237:Color–color diagram 2102:Protoplanetary disk 1906:Proton–proton chain 1584:Chemically peculiar 900:Magnetic switchback 202:proton–proton chain 182:main sequence stars 170:Main sequence stars 2471:Lowest temperature 2222:Photometric system 2192:Absolute magnitude 2126:Circumstellar dust 1739:Stellar black hole 1375:Stellar population 1261:Herbig–Haro object 1090:Sunlight radiation 685:Internal structure 625:2015-11-16 at the 612:2015-11-16 at the 229:solar granulation. 110: 33: 2703:Stellar phenomena 2685: 2684: 2588:Substellar object 2567:Planetary nebulae 1986:Luminous red nova 1896:Deuterium burning 1882: 1881: 1365:Instability strip 1345:Wolf-Rayet nebula 1299:Horizontal branch 1244:Pre-main-sequence 1156: 1155: 1120:Solar observatory 1035:Solar observation 933:Termination shock 849: 848: 801:Transition region 592:978-0-03-006228-5 573:978-0-387-20089-7 122:convective region 2710: 2677:Stars portal 2675: 2674: 2663: 2662: 2319:Planetary system 2242:Strömgren sphere 2114:Asteroseismology 1835:Black hole star 1407: 1406: 1333:Planetary nebula 1294:Red-giant branch 1183: 1176: 1169: 1160: 1159: 1146: 1145: 735:Supergranulation 723: 722: 657: 650: 643: 634: 633: 596: 577: 547: 546: 520: 500: 494: 493: 467: 465:astro-ph/0309348 447: 441: 440: 414: 394: 388: 387: 361: 341: 335: 334: 308: 306:astro-ph/0105054 288: 2718: 2717: 2713: 2712: 2711: 2709: 2708: 2707: 2688: 2687: 2686: 2681: 2669: 2651: 2576: 2545:Milky Way novae 2481:Smallest volume 2425: 2406:Radial velocity 2329: 2323: 2275:Common envelope 2251: 2150: 2119:Helioseismology 2090:Bipolar outflow 2031:Microturbulence 2026:Convection zone 2007: 1901:Lithium burning 1888:Nucleosynthesis 1878: 1760: 1669: 1396: 1275: 1224:Molecular cloud 1205: 1192: 1187: 1157: 1152: 1134: 1108: 1094: 1060:Solar telescope 1040:Solar phenomena 1015:Solar astronomy 952: 914: 910:Helioseismology 845: 831:Helmet streamer 787: 759: 712: 708:Convection zone 679: 666: 661: 627:Wayback Machine 614:Wayback Machine 603: 593: 574: 556: 554:Further reading 551: 550: 501: 497: 448: 444: 395: 391: 342: 338: 289: 285: 280: 264:red giant stars 260: 178: 172: 118:convective zone 114:convection zone 108: 107: 68:Convection zone 17: 12: 11: 5: 2716: 2706: 2705: 2700: 2683: 2682: 2680: 2679: 2667: 2656: 2653: 2652: 2650: 2649: 2644: 2639: 2634: 2629: 2624: 2619: 2614: 2613: 2612: 2607: 2606: 2605: 2600: 2584: 2582: 2578: 2577: 2575: 2574: 2569: 2564: 2563: 2562: 2557: 2547: 2542: 2537: 2532: 2527: 2522: 2517: 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578: 572: 555: 552: 549: 548: 495: 442: 405:(3): 787–790. 389: 336: 282: 281: 279: 276: 259: 256: 250:is called the 248:radiation zone 206:radiation zone 186:nuclear fusion 171: 168: 134:radiation zone 106: 105: 100: 95: 90: 85: 80: 75: 73:Radiation zone 70: 65: 60: 55: 50: 44: 43: 15: 9: 6: 4: 3: 2: 2715: 2704: 2701: 2699: 2696: 2695: 2693: 2678: 2673: 2668: 2666: 2658: 2657: 2654: 2648: 2645: 2643: 2640: 2638: 2637:Intergalactic 2635: 2633: 2630: 2628: 2625: 2623: 2620: 2618: 2617:Galactic year 2615: 2611: 2608: 2604: 2601: 2599: 2596: 2595: 2594: 2591: 2590: 2589: 2586: 2585: 2583: 2579: 2573: 2570: 2568: 2565: 2561: 2558: 2556: 2553: 2552: 2551: 2548: 2546: 2543: 2541: 2538: 2536: 2533: 2531: 2528: 2526: 2523: 2521: 2518: 2514: 2511: 2507: 2504: 2503: 2502: 2499: 2497: 2496:Most luminous 2494: 2492: 2489: 2487: 2484: 2482: 2479: 2477: 2474: 2472: 2469: 2467: 2464: 2462: 2459: 2458: 2457: 2454: 2450: 2447: 2445: 2442: 2441: 2440: 2437: 2436: 2434: 2432: 2428: 2422: 2419: 2417: 2414: 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Boötis 1617: 1615: 1612: 1610: 1607: 1605: 1602: 1600: 1597: 1595: 1592: 1590: 1587: 1586: 1585: 1582: 1580: 1577: 1573: 1570: 1568: 1565: 1563: 1560: 1559: 1558: 1555: 1551: 1548: 1547: 1546: 1543: 1539: 1536: 1534: 1531: 1529: 1526: 1525: 1524: 1521: 1519: 1516: 1512: 1509: 1507: 1504: 1502: 1499: 1498: 1497: 1494: 1492: 1489: 1487: 1484: 1482: 1479: 1475: 1472: 1470: 1467: 1466: 1465: 1462: 1458: 1455: 1453: 1450: 1448: 1445: 1443: 1440: 1438: 1435: 1433: 1430: 1428: 1425: 1424: 1422: 1420: 1417: 1415: 1412: 1411: 1408: 1405: 1403: 1399: 1391: 1388: 1386: 1385:Superluminous 1383: 1382: 1381: 1378: 1376: 1373: 1371: 1368: 1366: 1363: 1361: 1358: 1356: 1353: 1351: 1348: 1346: 1343: 1339: 1336: 1335: 1334: 1331: 1329: 1326: 1322: 1319: 1317: 1314: 1313: 1312: 1309: 1305: 1302: 1301: 1300: 1297: 1295: 1292: 1290: 1289:Main sequence 1287: 1286: 1284: 1282: 1278: 1272: 1269: 1267: 1266:Hayashi track 1264: 1262: 1259: 1255: 1252: 1250: 1247: 1245: 1242: 1240: 1237: 1236: 1235: 1232: 1230: 1227: 1225: 1222: 1220: 1217: 1216: 1214: 1212: 1208: 1202: 1199: 1198: 1195: 1191: 1184: 1179: 1177: 1172: 1170: 1165: 1164: 1161: 1149: 1141: 1140: 1137: 1131: 1128: 1126: 1123: 1121: 1118: 1117: 1115: 1111: 1107: 1103: 1101: 1097: 1091: 1088: 1086: 1083: 1081: 1078: 1076: 1075:Space weather 1073: 1071: 1070:Space climate 1068: 1066: 1063: 1061: 1058: 1056: 1053: 1051: 1048: 1046: 1045:Solar physics 1043: 1041: 1038: 1036: 1033: 1031: 1028: 1026: 1023: 1021: 1018: 1016: 1013: 1011: 1008: 1006: 1003: 997: 994: 993: 992: 989: 988: 987: 984: 982: 979: 975: 974:Lunar eclipse 972: 970: 967: 966: 965: 962: 961: 959: 955: 949: 946: 944: 941: 939: 936: 934: 931: 929: 928:Current sheet 926: 925: 923: 921: 917: 911: 908: 906: 903: 901: 898: 896: 893: 891: 888: 886: 885:Solar minimum 883: 881: 880:Solar maximum 878: 876: 875:Active region 873: 869: 866: 865: 864: 861: 860: 858: 856: 852: 842: 839: 837: 834: 832: 829: 827: 824: 822: 819: 817: 814: 812: 809: 807: 804: 802: 799: 798: 796: 794: 790: 784: 781: 779: 776: 774: 771: 770: 768: 766: 762: 756: 755:Ellerman bomb 753: 751: 748: 746: 743: 741: 738: 736: 733: 732: 730: 728: 724: 721: 719: 715: 709: 706: 704: 701: 699: 696: 694: 691: 690: 688: 686: 682: 676: 673: 672: 669: 665: 658: 653: 651: 646: 644: 639: 638: 635: 628: 624: 621: 618: 615: 611: 608: 605: 604: 594: 588: 584: 579: 575: 569: 565: 564: 558: 557: 544: 540: 536: 532: 528: 524: 519: 514: 510: 506: 499: 491: 487: 483: 479: 475: 471: 466: 461: 457: 453: 446: 438: 434: 430: 426: 422: 418: 413: 408: 404: 400: 393: 385: 381: 377: 373: 369: 365: 360: 355: 351: 347: 340: 332: 328: 324: 320: 316: 312: 307: 302: 298: 294: 287: 283: 275: 273: 269: 265: 255: 253: 249: 244: 242: 241:Hayashi track 238: 234: 230: 226: 222: 218: 214: 209: 207: 203: 199: 195: 191: 187: 183: 177: 167: 165: 164:heat capacity 161: 158: 153: 148: 145: 143: 139: 135: 131: 127: 123: 119: 115: 104: 101: 99: 96: 94: 91: 89: 86: 84: 81: 79: 76: 74: 71: 69: 66: 64: 61: 59: 56: 54: 51: 49: 46: 45: 42: 37: 30: 26: 21: 2540:White dwarfs 2530:Brown dwarfs 2513:Most distant 2461:Most massive 2439:Proper names 2399:Photographic 2352:Solar System 2330:observations 2257:Star systems 2080:Stellar wind 2063:Chromosphere 2036:Oscillations 2025: 1916:Helium flash 1766:Hypothetical 1744:X-ray binary 1683:Compact star 1518:Bright giant 1271:Henyey track 1249:Herbig Ae/Be 1055:Solar System 1025:Solar energy 1020:Solar dynamo 981:Heliophysics 811:Coronal loop 806:Coronal hole 783:Moreton wave 765:Chromosphere 707: 582: 562: 508: 504: 498: 455: 451: 445: 402: 398: 392: 349: 345: 339: 296: 292: 286: 261: 245: 237:solar masses 210: 179: 149: 146: 121: 117: 113: 111: 88:Solar corona 67: 63:Chromosphere 2593:Brown dwarf 2369:Circumpolar 2247:Kraft break 2227:Color index 2202:Metallicity 2162:Designation 2131:Cosmic dust 2053:Photosphere 1819:Dark-energy 1794:Electroweak 1779:Black dwarf 1710:Radio-quiet 1693:White dwarf 1579:White dwarf 1229:Bok globule 1113:Exploration 991:Solar deity 938:Heliosheath 920:Heliosphere 890:Wolf number 863:Solar cycle 727:Photosphere 458:: 213–218. 299:: 190–198. 235:below 0.35 157:temperature 58:Photosphere 2698:Convection 2692:Categories 2555:Candidates 2550:Supernovae 2535:Red dwarfs 2394:Extinction 2182:Kinematics 2177:Luminosity 2155:Properties 2048:Atmosphere 1946:Si burning 1936:Ne burning 1874:White hole 1847:Quasi-star 1774:Blue dwarf 1629:Technetium 1545:Hypergiant 1523:Supergiant 1065:Solar time 986:In culture 943:Heliopause 895:Solar wind 826:Prominence 718:Atmosphere 703:Tachocline 511:(2): 511. 278:References 258:Red giants 252:tachocline 233:red dwarfs 213:ionization 174:See also: 142:conduction 130:convection 103:Solar wind 98:Prominence 83:Solar core 78:Tachocline 2486:Brightest 2384:Magnitude 2364:Pole star 2285:Symbiotic 2280:Eclipsing 2212:Starlight 2013:Structure 2003:Supernova 1996:Micronova 1991:Recurrent 1976:Symbiotic 1961:p-process 1956:r-process 1951:s-process 1941:O burning 1931:C burning 1911:CNO cycle 1854:Gravastar 1390:Hypernova 1380:Supernova 1355:Dredge-up 1328:Blue loop 1321:super-AGB 1304:Red clump 1281:Evolution 1239:Protostar 1219:Accretion 1211:Formation 948:Bow shock 855:Variation 821:Nanoflare 518:0805.3242 412:0901.1659 359:1304.3337 272:dredge-up 138:radiation 29:red giant 2665:Category 2560:Remnants 2456:Extremes 2416:Parallax 2389:Apparent 2379:Asterism 2357:Sunlight 2307:Globular 2292:Multiple 2217:Variable 2207:Rotation 2167:Dynamics 2058:Starspot 1732:Magnetar 1675:Remnants 1491:Subgiant 1464:Subdwarf 1316:post-AGB 1148:Category 623:Archived 610:Archived 543:18811290 437:15159121 384:54707309 331:18153904 217:hydrogen 190:hydrogen 160:gradient 48:Granules 2632:Gravity 2581:Related 2501:Nearest 2449:Chinese 2297:Cluster 2270:Contact 2107:Proplyd 1981:Remnant 1869:Blitzar 1843:Hawking 1799:Strange 1749:Burster 1705:Neutron 1658:Extreme 1609:He-weak 1254:T Tauri 964:Eclipse 957:Related 778:Spicule 750:Sunspot 745:Faculae 740:Granule 664:The Sun 523:Bibcode 490:2590382 470:Bibcode 417:Bibcode 364:Bibcode 352:: A23. 311:Bibcode 225:opacity 53:Sunspot 2622:Galaxy 2610:Planet 2598:Desert 2506:bright 2444:Arabic 2265:Binary 2085:Bubble 1809:Planck 1784:Exotic 1720:Binary 1715:Pulsar 1653:Helium 1614:Barium 1557:Carbon 1550:Yellow 1538:Yellow 1511:Yellow 1350:PG1159 793:Corona 589:  570:  541:  488:  435:  382:  329:  221:helium 194:helium 27:and a 2627:Guest 2431:Lists 2312:Super 1966:Fusor 1839:Black 1824:Quark 1804:Preon 1789:Boson 1725:X-ray 1641:Shell 1594:Ap/Bp 1496:Giant 1414:Early 1360:OH/IR 1190:Stars 905:Flare 773:Plage 539:S2CID 513:arXiv 486:S2CID 460:arXiv 433:S2CID 407:arXiv 380:S2CID 354:arXiv 327:S2CID 301:arXiv 192:into 124:of a 93:Flare 2302:Open 2197:Mass 2021:Core 1971:Nova 1864:Iron 1814:Dark 1624:Lead 1604:HgMn 1599:CEMP 1528:Blue 1501:Blue 1419:Late 1201:List 1085:Star 996:List 693:Core 675:List 587:ISBN 568:ISBN 219:and 150:The 140:and 126:star 2603:Sub 2337:Sun 1756:SGR 1533:Red 1506:Red 531:doi 509:486 478:doi 456:212 425:doi 403:496 372:doi 350:554 319:doi 297:373 262:In 215:of 188:of 180:In 120:or 41:Sun 25:Sun 2694:: 1636:Be 1589:Am 1572:CH 1567:CN 1486:OB 1481:WR 537:. 529:. 521:. 507:. 484:. 476:. 468:. 454:. 431:. 423:. 415:. 401:. 378:. 370:. 362:. 348:. 325:. 317:. 309:. 295:. 254:. 144:. 116:, 112:A 1829:Q 1648:B 1562:S 1474:B 1469:O 1457:M 1452:K 1447:G 1442:F 1437:A 1432:B 1427:O 1182:e 1175:t 1168:v 656:e 649:t 642:v 595:. 576:. 545:. 533:: 525:: 515:: 492:. 480:: 472:: 462:: 439:. 427:: 419:: 409:: 386:. 374:: 366:: 356:: 333:. 321:: 313:: 303::

Index


Sun
red giant

Sun
Granules
Sunspot
Photosphere
Chromosphere
Convection zone
Radiation zone
Tachocline
Solar core
Solar corona
Flare
Prominence
Solar wind
star
convection
radiation zone
radiation
conduction
Schwarzschild criterion
temperature
gradient
heat capacity
Radiation zone § Stability against convection
main sequence stars
nuclear fusion
hydrogen

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