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HD 15236


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On the evolution and fate of super-massive stars
Context: We study the evolution and fate of solar compositionsuper-massive stars in the mass range 60-1000 Mȯ. Ourstudy is relevant for very massive objects observed in young stellarcomplexes as well as for super-massive stars that could potentially formthrough runaway stellar collisions. Aims: We predict the outcomes ofstellar evolution by employing a mass-loss prescription that isconsistent with the observed Hertzsprung-Russell Diagram location of themost massive stars. Methods: We compute a series of stellar models withan appropriately modified version of the Eggleton evolutionary code. Results: We find that super-massive stars with initial masses up to 1000Mȯ end their lives as objects less massive than≃150 Mȯ. These objects are expected to collapseinto black holes (with M ⪉ 70 ~Mȯ) or explode aspair-instability supernovae. Conclusions: We argue that ifultraluminous X-ray sources (ULXs) contain intermediate-mass blackholes, these are unlikely to be the result of runaway stellar collisionsin the cores of young clusters.

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Observation and Astrometry data

Constellation:Horloge
Right ascension:02h24m20.71s
Declination:-64°54'16.3"
Apparent magnitude:9.644
Proper motion RA:2
Proper motion Dec:-4.3
B-T magnitude:10.28
V-T magnitude:9.697

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 15236
TYCHO-2 2000TYC 8861-1518-1
USNO-A2.0USNO-A2 0225-00601746
HIPHIP 11214

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