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Astron. Astrophys. Suppl. Ser. 145, 473-479

Intrinsic colour calibration for F, G, K stars

P. Bonifacio1 - E. Caffau2 - P. Molaro1

Send offprint request: P. Bonifacio

1 - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
2 - Istituto Magistrale S.P.P. e L. annesso al Convitto Nazionale Paolo Diacono, S. Pietro al Nat. Udine, Italy

Received May 5; accepted June 29, 2000


We derive an intrinsic colour calibration for F-K stars using broad band Johnson colours and line indices KP and HP2. Through this calibration we can determine E(B-V) of an individual star within 0.03 mag. The E(B-V) values thus derived are in excellent agreement with those derived from Strömgren photometry through the Schuster & Nissen (1989) calibration. The agreement is also good with the reddening maps of Burstein & Heiles (1982) and Schlegel et al. (1998), although in this case there exists a small offset of about 0.01 mag. This calibration may be applied to the large body of data of the HK survey extension which will be published in the near future.

Key words: stars: atmospheres -- stars: general -- ISM: dust, extinction

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