An Extensive Photometric Investigation of the W UMa System DK Cyg

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="8"><hr/></td></tr><tr class="thead"><td align="left" rowspan="2">Star name</td><td align="center" colspan="6">Parameters</td><td align="center" rowspan="2">References</td></tr><tr class="thead"><td align="center"><span style="width: 46.5246ptpx;"><svg height="13.2199pt" id="M82" style="vertical-align:-3.542pt" version="1.1" viewbox="-0.0498162 -9.6779 46.5246 13.2199" width="46.5246pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0135,0,0,-0.0135,0,0)"><path d="M962 650H795L470 145L347 650H176L170 622C268 613 275 606 244 503L190 322C150 188 132 126 118 91C102 50 80 33 18 28L12 0H245L251 28C175 35 170 48 174 93C177 128 191 180 220 284L292 542H294C331 392 383 150 409 4H432L774 555H776L714 137C700 40 694 34 612 28L606 0H868L874 28C793 34 784 37 797 137L849 533C859 612 863 616 956 622L962 650Z" id="g113-78"></path><glyph.data 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316 408 376 408 465C408 570 327 635 237 635C179 635 131 609 100 575L42 494L67 471C94 510 138 565 205 565C277 565 321 517 321 435C321 348 258 270 195 195C146 137 88 81 33 26V0H411C423 44 433 88 446 135L414 144Z" id="g50-51"></path><glyph.data ascent="3443" descent="-2856" horiz-adv-x="487" vert-adv-y="487"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,13.778,0)"><path d="M300 -147C201 -63 143 98 143 270S200 602 300 686L282 710C136 610 70 450 70 271V270C70 89 136 -72 282 -170L300 -147Z" id="g113-41"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="346" vert-adv-y="346"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,18.465,0)"><path d="M541 160L512 170C485 116 462 88 439 67C411 41 376 35 318 35C272 35 238 37 224 48C207 61 205 85 212 121L290 533C305 611 308 615 391 622L397 650H139L133 622C217 615 221 612 206 533L126 118C111 41 103 34 23 26L17 0H474C489 31 528 124 541 160Z" id="g113-77"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="553" vert-adv-y="553"></glyph.data></g><g transform="matrix(.0095,0,0,-0.0095,27.109,3.264)"><path d="M594 262C594 419 464 546 305 546S17 419 17 262S146 -22 305 -22S594 105 594 262ZM538 262C538 131 433 25 305 25S73 131 73 262S177 499 305 499S538 393 538 262ZM365 262C365 297 340 323 305 323C271 323 246 297 246 262C246 225 271 201 305 201C340 201 365 225 365 262Z" id="g54-72"></path><glyph.data ascent="3443" descent="-2856" horiz-adv-x="611" vert-adv-y="611"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,33.424,0)"><path d="M275 270C275 450 212 609 64 710L45 686C145 604 203 442 203 270S147 -63 45 -147L64 -170C213 -68 275 89 275 270Z" id="g113-42"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="346" vert-adv-y="346"></glyph.data></g></svg></span></td></tr><tr><td class="thead-hr" colspan="8"><hr/></td></tr><tr><td align="left">YY CrB</td><td align="center">1.404</td><td align="center">0.339</td><td align="center">1.427</td><td align="center">0.757</td><td align="center">2.58</td><td align="center">6.68</td><td align="center">1</td></tr><tr><td align="left">AW UMa</td><td align="center">1.6</td><td align="center">0.121</td><td align="center">1.786</td><td align="center">0.739</td><td align="center">7.47</td><td align="center">0.804</td><td align="center">2</td></tr><tr><td align="left">EQ Tau</td><td align="center">1.214</td><td align="center">0.541</td><td align="center">1.136</td><td align="center">0.787</td><td align="center">1.31</td><td align="center">0.6</td><td align="center">3</td></tr><tr><td align="left">RR Cen</td><td align="center">1.82</td><td align="center">0.38</td><td align="center">2.1</td><td align="center">1.05</td><td align="center">8.89</td><td align="center">2.2</td><td align="center">4</td></tr><tr><td align="left">V566 Oph</td><td align="center">1.41</td><td align="center">0.34</td><td align="center">1.45</td><td align="center">0.77</td><td align="center">4.46</td><td align="center">1.23</td><td align="center">5</td></tr><tr class="table-tr"><td colspan="8"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td> (1) Essam et al.  [<a href="/journals/jas/2015/590673/#B19">38</a>], (2) Elkhateeb and Nouh  [<a href="/journals/jas/2015/590673/#B16">39</a>], (3) Elkhateeb and Nouh  [<a href="/journals/jas/2015/590673/#B17">40</a>], (4) Yang et al.  [<a href="/journals/jas/2015/590673/#B52">41</a>], and (5) Degirmenci [<a href="/journals/jas/2015/590673/#B9">42</a>].<br/></td></tr></table>

Physical parameters of the five A-type contact binaries.

Journal of Astrophysics

tab5

Table 5

Table 5: An Extensive Photometric Investigation of the W UMa System DK Cyg 