Photometry and membership for low mass stars in the young open cluster NGC 2516

R. D. Jeffries, M. R. Thurston, N. C. Hambly

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of a 0.86 square degree CCD photometric survey of the open cluster NGC 2516, which has an age of about 150 Myr and may have a much lower metallicity than the similarly-aged Pleiades. Our BVI_c survey of cluster members is complete to V =~ 20 and is used to select a preliminary catalogue of 1254 low mass (0.21.5 Msun) stars included. Taking this into account, it is probable that the whole-cluster mass functions for NGC 2516 and the Pleiades are similar down to 0.3 Msun. The mass of NGC 2516 stars with M>0.3 Msun inside our survey is 950-1200 Msun, depending on metallicity and what corrections are applied for unresolved binarity. Correcting for mass segregation increases this to ~ 1240-1560 Msun, about twice the total mass of the Pleiades. If NGC 2516 and the Pleiades do have similar mass functions, then less massive stars and brown dwarfs contribute about a further 15 percent to the mass of NGC 2516 and we predict a cluster population of about 360-440 brown dwarfs with 0.030
Original languageEnglish
Pages (from-to)863-889
JournalAstronomy & Astrophysics
Volume375
DOIs
Publication statusPublished - 1 Sep 2001

Keywords

  • OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: NGC 2516
  • STARS: LUMINOSITY FUNCTION
  • MASS FUNCTION
  • STARS: BINARIES: GENERAL

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