view Abstract Citations (6) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Hot End of Evolutionary Horizontal Branches Castellani, V. ; degl'Innocenti, S. ; Pulone, L. Abstract In this paper we investigate the hot end of the horizontal branch (HB), presenting evolutionary constraints concerning the C-M diagram location and the gravity of hot HB stars. According to the adopted evolutionary scenario, we predict an upper limit for HB temperatures of about log Te = 4A5, remarkably cooler than previous estimates. We find that such a theoretical prescription appears in good agreement with available observational data concerning both stellar temperatures and gravities. Finally, the problem of gaps in the HB distribution is discussed, suggesting that, at least in the case of the cluster NGC 6752, evolutionary gaps, a bimodal distribution of CNO, and stellar rotation should all play a negligible role. Publication: The Astrophysical Journal Pub Date: June 1995 DOI: 10.1086/175780 arXiv: arXiv:astro-ph/9407057 Bibcode: 1995ApJ...446..228C Keywords: GALAXY: GLOBULAR CLUSTERS: INDIVIDUAL NGC NUMBER: NGC 6752; STARS: AGB AND POST-AGB; STARS: EVOLUTION; STARS: HERTZSPRUNG-RUSSELL DIAGRAM; STARS: INTERIORS; STARS: POPULATION II; Astrophysics E-Print: postscript file of 10 pages plus 1 tables,rep.1 5 figures will be added later as postscript file The tex file and the other two not postscript figures are available upon request at scilla@vaxfe.fe.infn.it, rep.1 full text sources arXiv | ADS | data products SIMBAD (4)