We present the methods and preparatory work for our study of the collisional runaway scenario to form a very massive star (VMS, M∗ > 400M⊙) at the centre of a young, compact stellar cluster. In the first phase of the process, a very dense central core of massive stars (M∗ ≃ 30− 120M⊙) forms through mass segregation and gravothermal collapse. This leads to a collisional stage, likely to result i...

Randolph M. Nesse Departments of Psychiatry, Psychology, and Research Center for Group Dynamics at the Institute for Social Research University of Michigan Ann Arbor, MI, USA [email protected] Abstract Runaway social selection resulting from partner choice may have shaped aspects of human cooperation and complex sociality that are otherwise hard to account for. Social selection is the subtype of ...

PROBLEM Various demographic and familial risk factors have been linked to runaway behavior. To date, there has not been a systematic investigation of the impact of size of community on runaway behavior. This study will compare runaways from smaller cities and rural areas to their urban counterparts. METHODS A convenience sample of 602 adolescents was interviewed between 1995 and August of 199...

The runaway greenhouse represents the ultimate climate catastrophe for rocky, Earth-like worlds: when incoming stellar flux cannot be balanced by radiation to space, oceans evaporate and exacerbate heating, turning planet into a hot wasteland with steam atmosphere overlying possibly molten magma surface. equilibrium state beyond instellation limit depends on radiative properties of its temperat...

Context. HD 195592 is an O-type super-giant star, known as a well-established runaway. Recently, a Fermi γ-ray source (2FGL J2030.7+4417) with a position compatible with that of HD 195592 has been reported. Aims. Our goal is to explore the scenario where HD 195592 is the counterpart of the Fermi γ-ray source, modeling the non-thermal emission produced in the bowshock of the runaway star. Method...

PURPOSE Homeless youth are at particularly high risk for teen pregnancy; research indicates as many as 20% of homeless young women become pregnant. These pregnant and homeless teens lack financial resources and adequate health care, resulting in increased risk for low-birth-weight babies and high infant mortality. This study investigated individual and family-level predictors of teen pregnancy ...

The presence of energetic runaway electron beams above thunderstorms is suggested by observations of terrestrial gamma ray flashes [Fishman et al., 1994], as well as by theoretical work [Roussel-Dupré and Gurevich, 1996; Lehtinen et al., 1999], although such beams have not been directly measured. In this paper we consider possible measurable effects of such beams in the conjugate hemisphere as ...