Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.355..475b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 355, Issue 2, pp. 475-484.
Astronomy and Astrophysics
Astronomy
11
Stars: Imaging, Stars: Individual: Hd 219460, Stars: Individual: Wr 157, Stars: Luminosity Function, Mass Function, Stars: Wolf-Rayet, Open Clusters And Associations: Individual: Markarian 50
Scientific paper
We report on a deep CCD UBV(RI)C photometric survey in the region of the young open cluster Markarian 50. The new photometric data allow us to extend the cluster membership down to V~ 17.5, about 2 mag deeper than any previous investigation. On the basis of these data we derive a distance d= 3460 +/- 350 pc (VO-MV= 12.7 +/- 0.2), which turns out to be only slightly lower than previous estimates. The cluster presents differential reddening, with E(B-V) values ranging from 0.69 to 1.1. The brightest member (HD 219460) is a double star, which we separate photometrically for the first time, providing individual magnitudes and colours for each component. One of them is a Wolf-Rayet (WR) star and, according to evolutionary models, the mass of its progenitor should be greater than ~20 Msolar. The age obtained for the cluster is 7.5 +/- 2 Myr and the mass function for the most massive stars (M > 1 Msolar) presents a slope x~ 1.0.
Baume Gustavo
Carraro Giovanni
Vazquez Ruben A.
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