The Main Sequence of the Globular Cluster M4=NGC 6121 From CCD NTT Photometry

Details The Main Sequence of the Globular Cluster M4=NGC 6121 From CCD NTT Photometry The Main Sequence of the Globular Cluster M4=NGC 6121 From CCD NTT Photometry

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..189a&link_type=abstract

Astronomical Journal v.114, p. 189-197 (1997)

Astronomy and Astrophysics

Astronomy

12

Scientific paper

With the ESO NTT, we have obtained accurate CCD UBVI photometry of 1649 stars in an extended field in the globular cluster M 4 = NGC 6121. The position of the main-sequence turnoff is found to be at V_TO=17(m.0) +/- 0(m.1) , (B-V)=0.863+/-0.007, (V-I)=1.224+/-0.010, (B-I)= 2.084+/-0.010. Our turnoff point is redder and fainter than those found for M 4 in the majority of recent studies, probably because of our field being located in the western, most reddened part of the cluster. The spread of stars around the main-sequence locus has an unusual shape (broadening near the turnoff point and close to the photometric limit), earlier noticed by \cite{rea95} and attributed by them to photometric effects. We have analyzed the possible reasons for this effect and concluded that, at least in our case, it is most probably due to differential absorption. We confirm the deviation of theoretical isochrones from the fainter parts of the M 4 main-sequence locus found by \cite{aea88}. Several curious structural details (a depression and an excess of stars) have been revealed in the brighter parts of the main-sequence luminosity function of M 4.

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