Difference between revisions of "Hertzsprung-Russell diagram (xfig example)"
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(Created page with "== Hertzsprung-Russell diagram == File:Hr_diagram.png <pre> % ------------- % axes, labels: variable xfig = xfig_plot_new(12,9); variable xmin = log10(3), xmax = log10(47...") |
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== Hertzsprung-Russell diagram == | == Hertzsprung-Russell diagram == | ||
| − | [[File:Hr_diagram.png]] | + | [[File:Hr_diagram.png|center|500px]] |
<pre> | <pre> | ||
Revision as of 13:46, 17 April 2018
Hertzsprung-Russell diagram
% -------------
% axes, labels:
variable xfig = xfig_plot_new(12,9);
variable xmin = log10(3), xmax = log10(47), ymin = -1., ymax = 7.; % x-axis is in kilo Kelvin
xfig.world(xmax, xmin, ymin, ymax);
xfig.axis(; ticlabels2=0, ticlabels_confine=0);
variable xmajor = log10([5:45:5]);
variable xminor = log10([1:50:1]);
variable x2major = [ymin:ymax:0.1];
variable x2minor = [ymin:ymax:0.02];
xfig.axis(; depth=0, tic_depth=0, ticlabels_confine=0);
xfig.x1axis(; ticlabels=["O","B","A","F","G","K","M"], major=log10([32,18,10,7,5.5,4.25,3.25]), major_width=0);
xfig.xlabel("Spectral class");
xfig.x2axis(; ticlabels=["5","10","15","20","25","30","35","40","45"R], major=xmajor, minor=xminor, format="%.0f");
xfig.x2label("$T_{\mathrm{eff}}\,(10^3\,\mathrm{K})$"R);
xfig.y2axis(; ticlabels=0);
xfig.ylabel("$\log (L/{L}_{\odot})$"R);
% -------------
% --------------------
% evolutionary tracks:
% from Ekstroem et al. 2012, A&A, 537, A146
variable tracks = struct{ m1, m3, m7, m20 };
tracks.m1 = struct{ log_teff, log_l }; % track for 1 solar mass
tracks.m3 = struct{ log_teff, log_l }; % track for 3 solar mass
tracks.m7 = struct{ log_teff, log_l }; % track for 7 solar mass
tracks.m20 = struct{ log_teff, log_l }; % track for 20 solar mass
tracks.m1.log_teff = [3.754330,3.755300,3.755330,3.755400,3.755480,3.755580,3.755700,3.755810,3.755940,3.756070,3.756190,3.756330,3.756470,3.756610,3.756730,3.756860,3.757000,3.757150,3.757270,3.757420,3.757570,3.757700,3.757850,
3.757980,3.758140,3.758270,3.758420,3.758580,3.758710,3.758870,3.759000,3.759140,3.759290,3.759430,3.759610,3.759770,3.759930,3.760120,3.760280,3.760440,3.760600,3.760780,3.760940,3.761100,3.761250,3.761410,
3.761560,3.761670,3.761800,3.761950,3.762060,3.762180,3.762300,3.762410,3.762520,3.762620,3.762750,3.762820,3.762880,3.762950,3.763020,3.763080,3.763140,3.763190,3.763240,3.763290,3.763330,3.763370,3.763400,
3.763430,3.763450,3.763470,3.763480,3.763490,3.763480,3.763470,3.763450,3.763410,3.763360,3.763290,3.763220,3.763140,3.763040,3.762940,3.762850,3.762800,3.762770,3.762750,3.762730,3.762680,3.762650,3.762630,
3.762610,3.762560,3.762530,3.762480,3.762460,3.762410,3.762390,3.762350,3.762300,3.762280,3.762230,3.762180,3.762120,3.762070,3.762010,3.761920,3.761860,3.761740,3.761640,3.761580,3.761520,3.761450,3.761440,
3.761400,3.761350,3.761300,3.761230,3.761170,3.761100,3.761030,3.760930,3.760850,3.760760,3.760650,3.760490,3.760360,3.760230,3.760080,3.759870,3.759710,3.759530,3.759340,3.759070,3.758850,3.758620,3.758370,
3.758020,3.757730,3.757430,3.757110,3.756620,3.756230,3.755810,3.755370,3.754740,3.754240,3.753690,3.753120,3.752290,3.751620,3.750900,3.750130,3.749010,3.748020,3.746900,3.745720,3.743960,3.742490,3.740860,
3.739060,3.737080,3.734070,3.731440,3.728450,3.724750,3.718820,3.713870,3.709260,3.703280,3.697400,3.692710,3.688030,3.684480,3.682560,3.680620,3.678870,3.677430,3.676030,3.674470,3.672500,3.670030,3.667120,
3.663040,3.656530,3.647770,3.646700,3.626800,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,3.556410,
3.556410,3.556410];
tracks.m1.log_l = [-0.138050,-0.129380,-0.126810,-0.124360,-0.122260,-0.119770,-0.117260,-0.114720,-0.112130,-0.109510,-0.107250,-0.104540,-0.101830,-0.099090,-0.096690,-0.093890,-0.091050,-0.088180,-0.085690,-0.082760,-0.079800,
-0.077230,-0.074220,-0.071610,-0.068540,-0.065890,-0.062750,-0.059600,-0.056880,-0.053670,-0.050910,-0.048120,-0.044830,-0.042000,-0.038660,-0.035760,-0.032850,-0.029430,-0.026470,-0.023490,-0.020480,-0.016960,
-0.013920,-0.010850,-0.007770,-0.004660,-0.001540,0.001590,0.004760,0.008470,0.011680,0.014910,0.018160,0.020890,0.024180,0.027500,0.030830,0.034170,0.037550,0.040950,0.044380,0.047800,0.051270,0.054190,0.057710,
0.061270,0.064840,0.068450,0.072080,0.075120,0.078800,0.082480,0.086200,0.089300,0.093030,0.096140,0.099880,0.102980,0.106070,0.109160,0.112220,0.115260,0.118280,0.121310,0.123730,0.124950,0.125560,0.126180,
0.126790,0.128040,0.128660,0.129290,0.129920,0.131190,0.131840,0.133140,0.133800,0.135130,0.135810,0.137170,0.138550,0.139250,0.140630,0.142070,0.144260,0.145740,0.148010,0.151080,0.153420,0.157380,0.160590,
0.163010,0.165420,0.167860,0.171150,0.173650,0.176170,0.178710,0.182130,0.184720,0.187330,0.189970,0.193520,0.196210,0.198920,0.201650,0.205330,0.208130,0.210940,0.213780,0.217610,0.220520,0.223440,0.226400,
0.230380,0.233390,0.236430,0.239500,0.243630,0.246750,0.249900,0.253070,0.257320,0.260540,0.263770,0.267020,0.271370,0.274650,0.277930,0.281210,0.285580,0.288840,0.292080,0.295300,0.299510,0.302540,0.305550,
0.308480,0.312160,0.314740,0.317060,0.319060,0.320830,0.322500,0.322870,0.322620,0.321470,0.318760,0.316620,0.315640,0.317440,0.324700,0.337600,0.362110,0.393770,0.418910,0.461060,0.504440,0.550130,0.604380,
0.664270,0.729320,0.807500,0.897740,1.007900,1.152030,1.342320,1.390360,1.719880,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,2.638140,
2.638140,2.638140,2.638140,2.638140,2.638140,2.638140];
tracks.m3.log_teff = [4.104477,4.101130,4.098784,4.096932,4.095520,4.094152,4.092906,4.091568,4.090532,4.089462,4.088575,4.087603,4.086631,4.085654,4.084584,4.083618,4.082794,4.081863,4.080880,4.079909,4.078954,4.077811,4.076814,
4.075977,4.074953,4.073932,4.072905,4.071846,4.070604,4.069515,4.068425,4.067474,4.066353,4.065180,4.063810,4.062611,4.061387,4.060169,4.058875,4.057809,4.056518,4.054984,4.053684,4.052311,4.050895,4.049511,
4.048311,4.046844,4.045140,4.043617,4.042110,4.040580,4.038967,4.037586,4.035944,4.034328,4.032409,4.030733,4.028975,4.027469,4.025674,4.023859,4.022054,4.019996,4.018106,4.016439,4.014562,4.012628,4.010719,
4.008746,4.006818,4.004866,4.002865,4.000890,3.998964,3.997042,3.995170,3.993303,3.991514,3.989837,3.988263,3.986853,3.985639,3.984805,3.984479,3.984499,3.984547,3.984648,3.984781,3.984972,3.985252,3.985549,
3.985906,3.986334,3.986842,3.987464,3.988192,3.989086,3.990155,3.991399,3.992620,3.994326,3.996373,3.998494,4.001379,4.005055,4.009778,4.015627,4.024013,4.035578,4.027620,4.019198,4.014199,4.010884,4.008090,
4.005473,4.003593,4.001870,3.999673,3.998636,3.996650,3.995367,3.992839,3.991586,3.990325,3.988684,3.987023,3.985322,3.983579,3.981786,3.981786,3.979712,3.977541,3.975261,3.972866,3.970342,3.970342,3.967673,
3.964838,3.961813,3.958571,3.955076,3.955076,3.952064,3.948853,3.941737,3.937805,3.933549,3.928990,3.924054,3.918705,3.912862,3.907195,3.901103,3.894541,3.887346,3.879446,3.861010,3.850280,3.838353,3.824996,
3.807248,3.797427,3.777874,3.762034,3.748710,3.736734,3.724115,3.715732,3.707236,3.696032,3.686913,3.681703,3.677099,3.672587,3.668592,3.665801,3.663002,3.659846,3.657180,3.654128,3.651128,3.648095,3.645231,
3.642391,3.639711,3.637484,3.634593,3.632145,3.635666,3.641828,3.643987,3.646684,3.649874,3.652920,3.657066,3.660748,3.664139,3.667093,3.671135,3.674116,3.678197,3.680127,3.682554,3.684970,3.687178,3.688573,
3.690152,3.693206,3.695129,3.696329,3.697237,3.697691,3.697918,3.697847,3.697883,3.697758,3.697609,3.697464,3.697333,3.697136,3.697183,3.697142,3.697143,3.697211,3.697227,3.697261,3.697284,3.697322,3.697328,
3.697378,3.697393,3.697317,3.697438,3.697463,3.697494,3.697490,3.697448,3.697510,3.697517,3.697539,3.697554,3.697560,3.697585,3.697587,3.697635,3.697641,3.697657,3.697695,3.697711,3.697749,3.697767,3.697795,
3.697817,3.697833,3.697856,3.697868,3.697910,3.697926,3.697937,3.697953,3.697917,3.697939,3.697946,3.698006,3.697967,3.697968,3.697975,3.697975,3.697966,3.697966,3.698002,3.698044,3.698057,3.698066,3.698132,
3.698023,3.698025,3.697961,3.698303,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,
3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,
3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,3.698114,
3.698114,3.698114,3.698114,3.698114,3.698114,3.697860,3.697296,3.697150,3.696984,3.696565,3.696449,3.696182,3.695561,3.695231,3.694880,3.694011,3.693476,3.692530,3.691571,3.690567,3.688184,3.686590,3.684183,
3.680467,3.664628];
tracks.m3.log_l = [1.898976,1.898157,1.900368,1.903228,1.906229,1.909473,1.912669,1.915631,1.919331,1.922666,1.926119,1.929846,1.933160,1.936508,1.940077,1.943397,1.946812,1.950456,1.953744,1.956987,1.960515,1.963574,1.966817,1.970432,
1.973557,1.976631,1.980111,1.983128,1.986004,1.989179,1.992273,1.995433,1.998425,2.001378,2.004035,2.006924,2.009910,2.012560,2.015303,2.018372,2.020963,2.023431,2.026095,2.028576,2.031044,2.033705,2.036241,2.038570,
2.040540,2.043114,2.045241,2.047596,2.049719,2.051901,2.054142,2.056032,2.057709,2.059767,2.061599,2.063530,2.065377,2.067040,2.068619,2.070105,2.071634,2.073346,2.074828,2.076166,2.077634,2.078898,2.080094,2.081460,
2.082636,2.083775,2.085083,2.086236,2.087446,2.088730,2.089970,2.091433,2.092853,2.094588,2.096468,2.098816,2.101593,2.102334,2.102991,2.103922,2.104768,2.105640,2.106693,2.107692,2.108753,2.109920,2.111194,2.112641,
2.114297,2.116148,2.118172,2.120395,2.122534,2.125387,2.128790,2.132439,2.137256,2.142846,2.150769,2.160729,2.175909,2.197592,2.175125,2.185301,2.197447,2.202487,2.205639,2.208038,2.209410,2.210467,2.211650,2.212162,
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tracks.m20.log_l = [4.614872,4.619018,4.623463,4.628064,4.632737,4.637466,4.642282,4.646902,4.651751,4.656385,4.661088,4.665791,4.670511,4.675113,4.679815,4.684374,4.688887,4.693485,4.698080,4.702542,4.707066,4.711544,4.715935,
4.720303,4.724738,4.729042,4.733292,4.737656,4.741863,4.746114,4.750368,4.754505,4.758829,4.762955,4.767060,4.771277,4.775252,4.779310,4.783414,4.787365,4.791604,4.795450,4.799393,4.803348,4.807345,4.811222,
4.815075,4.819143,4.822897,4.826832,4.830508,4.834208,4.838174,4.841852,4.845683,4.849399,4.853005,4.856893,4.860380,4.864053,4.867646,4.871420,4.875058,4.878547,4.882123,4.885772,4.889355,4.892642,4.896518,
4.899881,4.903175,4.906892,4.910362,4.913800,4.917309,4.920896,4.924358,4.927805,4.931261,4.934769,4.938316,4.941806,4.945487,4.949152,4.953346,4.953955,4.954392,4.954824,4.955324,4.955727,4.956250,4.956724,
4.957139,4.957825,4.958402,4.959010,4.959752,4.960451,4.961028,4.961796,4.962637,4.963474,4.964382,4.965509,4.966926,4.968583,4.970716,4.973939,4.979591,5.001445,5.001124,5.001037,5.001511,5.001620,5.001418,
5.000994,5.000533,4.999532,4.999009,4.998868,4.998832,4.999701,5.000112,5.000569,5.000940,5.001460,5.002370,5.003414,5.003940,5.004542,5.007079,5.008093,5.009222,5.010330,5.012720,5.013875,5.015108,5.016161,
5.017312,5.019459,5.020446,5.021411,5.022304,5.023958,5.024722,5.025430,5.026101,5.027445,5.028046,5.028629,5.029155,5.030731,5.032783,5.033671,5.034464,5.035161,5.036341,5.036911,5.037367,5.037756,5.038404,
5.038645,5.038963,5.039237,5.039694,5.039913,5.040099,5.040396,5.040617,5.041060,5.041325,5.041635,5.041972,5.043553,5.043777,5.044529,5.045130,5.046146,5.046747,5.047740,5.049107,5.050077,5.051664,5.053038,
5.054470,5.055889,5.057324,5.058754,5.060176,5.061554,5.079041,5.077968,5.076456,5.075491,5.074597,5.073595,5.072307,5.071644,5.070583,5.069726,5.068636,5.068058,5.068567,5.069077,5.068065,5.064140,5.031244,
5.035243,5.035701,5.035921,5.036062,5.036010,5.036046,5.036147,5.036309,5.036548,5.036525,5.036667,5.036822,5.036834,5.037020,5.037013,5.037229,5.036882,5.037137,5.037262,5.037391,5.037315,5.037339,5.037681,
5.037828,5.037975,5.038057,5.038071,5.038007,5.038149,5.038147,5.038148,5.038245,5.038156,5.038130,5.038445,5.038370,5.038665,5.038515,5.038405,5.038626,5.038808,5.038602,5.038637,5.038637,5.038579,5.038594,
5.038617,5.038437,5.038473,5.037165,5.037742,5.039143,5.038086,5.037764,5.037443,5.037571,5.037662,5.037592,5.037355,5.037118,5.036936,5.036902,5.036804,5.036570,5.036718,5.036260,5.035812,5.035607,5.035755,
5.034917,5.034217,5.034203,5.033397,5.032968,5.032967,5.033404,5.032948,5.032644,5.032308,5.032250,5.032060,5.032566,5.031949,5.031713,5.031621,5.031498,5.031133,5.031457,5.030324,5.031045,5.030560,5.030498,
5.030130,5.030258,5.029916,5.029750,5.030537,5.029141,5.028812,5.029400,5.029178,5.029342,5.029554,5.028975,5.028874,5.028878,5.028918,5.029124,5.028626,5.028719,5.028838,5.028839,5.028714,5.028546,5.028391,
5.028626,5.028693,5.028537,5.028599,5.028749,5.028970,5.028942,5.028997,5.029142,5.029036,5.029335,5.029563,5.029759,5.029464,5.030334,5.030595,5.030709,5.031510,5.031447,5.031968,5.032612,5.033531,5.034031,
5.034918,5.036393,5.037789,5.040777,5.056702,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,5.058582,
5.058582,5.177863];
variable mass;
foreach mass (get_struct_field_names(tracks))
{
variable track = get_struct_field(tracks, mass);
xfig_plot_text( xfig, sprintf("$%s\\,M_{\\odot}$", strreplace(mass,"m","")), track.log_teff[0]-3, track.log_l[0], .1, 1.; size="small", depth=2, color="black");
xfig.plot(track.log_teff[[0:108:1]]-3,track.log_l[[0:108:1]]; depth=2, color="black"); % hydrogen core burning => main-sequence phase
xfig.plot(track.log_teff[[109:369:1]]-3,track.log_l[[109:369:1]]; depth=2, color="gray"); % post main-sequence phase
}
% --------------------
% -----
variable phi = [0:2*PI:#360];
% Sun:
xfig_plot_text(xfig, "$\\odot$", log10(5785)-3, 0, 0, 0; size="large", depth=1, color="goldenrod");
% Dwarfs:
variable angle = -33; % value depends on aspect ratio of figure
variable zams = struct{ log_teff, log_l }; % zero-age main sequence according to Ekstroem et al. 2012, A&A, 537, A146
zams.log_teff = [3.688210,3.724350,3.754330,3.779290,3.803820,3.824326,3.856430,3.909891,3.972774,4.048683,4.104477,4.186443,4.247069,4.332096,4.391638,4.456053,4.501169,4.553253,4.588704,4.623051,4.649728,4.689020,4.713497,4.729690];
zams.log_l = [-0.590900,-0.356030,-0.138050,0.063710,0.295030,0.459878,0.673904,0.913744,1.208899,1.596045,1.898976,2.365394,2.712744,3.220316,3.584321,3.977491,4.266387,4.614872,4.865990,5.125097,5.343182,5.703098,5.980312,6.231065];
variable tams = struct{ log_teff, log_l }; % terminal-age main sequence according to Ekstroem et al. 2012, A&A, 537, A146
tams.log_teff = [3.713490,3.741400,3.762730,3.781080,3.788900,3.803512,3.813527,3.820671,3.860109,3.926968,3.984781,4.077595,4.145771,4.237784,4.295675,4.352039,4.386232,4.417494,4.427468,4.422336,4.397432,4.152124,4.310353,4.433115];
tams.log_l = [-0.258470,-0.046390,0.126790,0.276170,0.493410,0.646927,0.833820,1.074095,1.372272,1.782232,2.104768,2.608506,2.981932,3.521011,3.906572,4.312416,4.603134,4.955324,5.191676,5.421882,5.607502,5.874329,6.106877,6.310356];
array_reverse(tams.log_teff);
array_reverse(tams.log_l);
xfig.shade_region([zams.log_teff,tams.log_teff]-3,[zams.log_l,tams.log_l]; width=0, color="darkgreen", depth=3);
xfig.add_object( xfig_new_text(sprintf("Dwarfs"); rotate=angle, depth=1, color="whitesmoke"), log10(14500)-3, 2.6);
% Subgiants:
xfig.add_object( xfig_new_text(sprintf("Subgiants"); rotate=angle, depth=1, color="black"), log10(11500)-3, 3.15);
% Supergiants:
xfig.shade_region((0.35*cos(phi)+log10(8)),(0.75*sin(phi)+4.75); width=0, depth=3, color="blue");
xfig_plot_text(xfig, "Supergiants", log10(8), 4.75, 0, 0; depth=1, color="whitesmoke");
% Giants:
xfig.shade_region((0.15*cos(phi)+log10(4.5)),(0.75*sin(phi)+2.75); width=0, depth=3, color="red");
xfig_plot_text(xfig, "Giants", log10(4.5), 2.75, 0, 0; depth=1, color="whitesmoke");
% White dwarfs
xfig.shade_region([0.1,0.2,0.4,0.3,0.2],[0.1,0.0,0.0,0.1,0.2]; width=0, depth=3, color="powderblue", world00);
xfig_plot_text(xfig, "White", log10(26), -0.05, 0, 0; rotate=angle-5, depth=1, color="black");
xfig_plot_text(xfig, "dwarfs", log10(28), -0.45, 0, 0; rotate=angle-5, depth=1, color="black");
% -----
xfig.render("HR_diagram.pdf");