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Nadeem Ansari
R S Chandel
Rizwana Jamal


The b-chromatic number ðœ‘(ðº) of a graph ðº is the greatest integer k such that ðº admits a proper k-coloring in which every color class ð‘– has a vertex realizing color ð‘– that is proficient to correspond with all the others color classes. The paper estimates the ð‘-chromatic number of helm graph, central graph of helm graph and middle graph of helm graph which is denoted by Hn, C(Hn) and ð‘€(Hn) respectively.


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