Abigail McCarthy. Chalmers M. Roberts, Judy Frank and Alfred Friendly will be the speakers at The Washington Post's Book and Author Luncheon at 12.30 p.m. Thursday in the Sheraton Park Hotel.

McCarthy, former wife of ex-senator and one-time presidential aspirant Eugene McCarthy, has just written "Circles," a novel about Washington power brokers who make and break men seemingly at will.

Roberts is author of "The Washington Post; The First Hundred Years." A retired Washington Post White House and diplomatic reporter, Roberts traces the history of The Post from its founding by Stilson Hutchins to its current preeminence under publisher Katharine Graham.

Judy Frank, representative of the Junior League of Washington, will speak about the book she co-edited. "The City of Washington; An Illustrated History." The volume contains more than 600 black-and-white photographs, plus drawings, maps and other visual material which capture the growth and change in the city from the time of Capt. John Smith's first reach up the Potomac to the coming of President Jimmy Carter.

Friendly, who has written "Beaufort of the Admiralty: The Life of Sir Francis Beaufort," is a Pulitizer Prize-winning reporter and former managing editor of The Washington Post.Friendly tells the story of one of the most gifted and complex figures of the 19th-century British Navy.

Ben Bradlee, executive editor of The Washington Post, will preside at the luncheon. Tickets, at $9 each, are available at The Post's front counter and at bookstores in the area.

Brentano's in Chevy Chase Center in Bethesda and Falls Church: Discount in Chevy Chase; Horizon in Alexandria; and in Washington at Brentano's. Discount, Francis Scott Key, Woodward & Lothrop. Sidney Kramer's and Simeon's.

For further information contact Enid Reque in The Washington Post promotion department at 223-7969.