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2006AJ....131..866S - Astron. J., 131, 866-888 (2006/February-0)
Hot populations in M 87 globular clusters.
SOHN S.T., O'CONNELL R.W., KUNDU A., LANDSMAN W.B., BURSTEIN D., BOHLIN R.C., FROGEL J.A. and ROSE J.A.
Abstract (from CDS):
Comparisons with Galactic open clusters indicate that the hot stars lie on the extreme horizontal branch, rather than being blue stragglers, and that the extreme horizontal branch becomes well populated for ages ≳5 Gyr. Existing model grids for clusters do not match the observations well, due to poorly understood giant branch mass loss or perhaps high helium abundances. We find that 41 of our UV detections have no optical-band counterparts. Most appear to be UV-bright background galaxies seen through M87. Eleven near-UV variable sources detected at only one epoch in the central field are probably classical novae. Two recurrent variable sources have no obvious explanation but could be related to activity in the relativistic jet.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Individual: Messier Number: M87 - Galaxies: Star Clusters - Galaxy: Globular Clusters: General - Ultraviolet: Galaxies
VizieR on-line data: <Available at CDS (J/AJ/131/866): table2.dat table4.dat table5.dat table6.dat>
Nomenclature: Table 2: [SOK2006] NUV-NN (Nos NUV-1 to NUV-22). Tables 4, 5: [SOK2006] NNNN N=55+43+48+16.
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.
Simbad objects: 43
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