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Astron. Astrophys. 327, 125-129 (1997)

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Dust properties in the direction of Trumpler 37

L. Morbidelli 1, P. Patriarchi 2, M. Perinotto 3, G. Barbaro 4 and A. Di Bartolomeo 4

1 CAISMI/CNR, Largo E. Fermi 5, I-50125 Firenze, Italy
2 GNA/CNR, c/o Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
3 Dipartimento di Astronomia e Scienza dello Spazio, Universitá di Firenze, Largo E. Fermi 5, I-50125 Firenze, Italy
4 Dipartimento di Astronomia, Universitá di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy

Received 13 March 1997 / Accepted 5 June 1997


The fourteen brightest OB stars of the Trumpler 37 Cluster have been observed in the [FORMULA] photometric bands. These have been used to derive accurate measurements of the quantity [FORMULA]. Different from previous studies it is found that [FORMULA] in Trumpler 37 is close to the mean interstellar value of 3.1. Most of the reddening towards Trumpler 37 is found to be of foreground origin. This is consistent with the lack of variations, observed by us, of [FORMULA] with the projected distance from the center of the cluster. In two highly reddened stars of the cluster, whose reddening is certainly mostly local, the observed [FORMULA] is lower than the mean interstellar value of 3.1. This is to be compared with the behaviour of the Trapezium stars in Orion, whose [FORMULA] is quite above such value whereas the age of the cluster is similar to the one of Trumpler 37.

Key words: clusters: open, and associations – Interstellar medium: extinction

Send offprint requests to: L. Morbidelli

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998