The extended main-sequence turn-off of the Milky Way open cluster Collinder 347
نویسندگان
چکیده
منابع مشابه
Stromgren Photometry at the Main-Sequence Turn-Off
We have observed (with vby filters) a field north of the core of the most massive globular cluster in our galaxy, ω Centauri. We have found a correlation of age and metallicity in a region which avoids the dense core and the inhomogeneous foreground dust emission shown by the IRAS satellite. Our observations show that the comparatively metal-rich stars (as defined by the (b− y) and m1 colors) a...
متن کاملOn the nature of a secondary main sequence turn - off in the rich LMC cluster NGC 1868
Evidence for a second main-sequence turn-off in a deep colour-magnitude diagram of NGC 1868 is presented. The data were obtained with HST/WFPC2 and reach down to m555 ≃ 25. Besides the usual τ ≃ 0.8 Gyr turn-off found in previous analyses, another possible turn-off is seen at m555 ≃ 21 (MV ≃ 2.5), which is consistent with an age of τ ≃ 3 Gyrs. This CMD feature stands out clearly especially when...
متن کاملCCD photometry of the old open cluster Collinder 261 ⋆
We present UBVI photometry for the old open cluster Collinder 261. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self consistent way reddening, distance, and age of the cluster: E(B−V)=0.25−0.34, (m-M)0=11.7-12.0, and age=7−8 Gyr or 9−11 Gyr, depending on the adopted stellar tracks. The models in better agreement w...
متن کاملA double main sequence turn - off in the rich star cluster NGC 1846 in the Large Magellanic Cloud
We report on HST/ACS photometry of the rich intermediate-age star cluster NGC 1846 in the Large Magellanic Cloud, which clearly reveals the presence of a double main sequence turn-off in this object. Despite this, the main sequence, sub-giant branch, and red giant branch are all narrow and well-defined, and the red clump is compact. We examine the spatial distribution of turn-off stars and demo...
متن کاملOn the Nature of Collinder 121: Insights from the Low-Mass Pre-Main Sequence
We present a V I photometric catalogue towards the open cluster Cr 121. XMMNewton and ROSAT data are used to discover a low-mass pre-main sequence (PMS) along this sight-line. de Zeeuw et al. (1999) identified Cr 121 as a moving group, using HIPPARCOS data, at a distance of 592 pc. We reject the scenario that these low-mass PMS stars are associated with that association. By considering the high...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2019
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stz2798