The Senate Select Committee on Ethics, meeting in closed session yesterday with an attorney for Sen. Edward W. Brooke (R-Mass.), outlined for the first time the scope of its investigation into Brooke's controversial financial affairs.

Committee Chairman Sen. Adlai E. Stevenson (D-III.) said that the 1 1/2-hour session with Charles Morin, who is serving as attorney for Brooke, that Morin raised some questions about several of the areas the committee has decided to investigate.

Stevenson declined to say which allegations his committee is looking at, but committee staff aides have said it will investigate a number of questions raised in the press about Brooke's financial affairs.

Sources close to Brooke's family also said yesterday that the Ethics Committee this week requested all information Brooke's wife, Remigia, and his two daughters could provide to support their allegations that Brooke claimed his daughters as federal income tax exemptions at a time when they were no longer financially dependent on him.

Brooke's family has opposed him in a bitter divorce action now under way in the Massachusetts courts. An investigation is being conducted by the Middlesex County district attorney's office into possible perjury by Brooke in connection with sworn statements he gave last year in connection with the divorce action.

Stevenson said yesterday that his committee will ask for guidance from the American Bar Association in the investigation here.

He said the ABA, as an impartial body, would be asked for its opinion on how far the Ethics Committee could proceed with its investigation without interfering with other investigations of Brooke, "criminal or otherwise."

Brooke, who is running for his third term in the Senate, has promised to appear publicly before the committee and to answer questions about his financial affairs. Stevenson said no date had been set for Brookde's appearance.

The Ethics Committee is also investigating alleged financial improprieties related to Sen. Herman E. Talmadge (D-Ga.). Yesterday's session did not take up any matters connected with Talmadge, Stevenson said.