A Critical Examination of Halo White Dwarf Candidates

A detailed analysis of halo white dwarf candidates is presented, which is based on model atmosphere fits to observed energy distributions built from photoelectric or photographic magnitudes. Most of the candidates identified in reduced proper motion diagrams are shown to be too warm (Teff > 5000 K) and most likely too young to be members of the galactic halo, while the tangential velocities of the cooler and thus older white dwarfs are shown to be entirely consistent with the disk population. The results suggest that some white dwarf stars born in the young disk may have high velocities with respect to the local standard of rest. Such objects could represent the remnants of donor stars from close mass-transfer binaries that produced type Ia supernovae via the single degenerate channel, or other scenarios suggested in the literature. Ongoing surveys that rely solely on reduced proper motion diagrams are likely to identify more of these high velocity young degenerates, rather than to unveil the old white dwarf population of the galactic halo. The importance of infrared photometry for studying extremely cool white dwarfs is also emphasized.Comment: Accepted for publication in the Astrophysical Journal, 16 pages, 9 figure

Lattice Diagram polynomials in one set of variables

The space $M_{\mu/i,j}$ spanned by all partial derivatives of the lattice polynomial $\Delta_{\mu/i,j}(X;Y)$ is investigated in math.CO/9809126 and many conjectures are given. Here, we prove all these conjectures for the $Y$-free component $M_{\mu/i,j}^0$ of $M_{\mu/i,j}$. In particular, we give an explicit bases for $M_{\mu/i,j}^0$ which allow us to prove directly the central {\sl four term recurrence} for these spaces.Comment: 15 page

President Bergeron\u27s 96th Commencement Address

In her first Commencement address at the College, President Bergeron tells the Class of 2014 that she wants to call out three qualities she has witnessed that make up what she would call the Connecticut College difference

Combinatorics of r-Dyck paths, r-Parking functions, and the r-Tamari lattices

This paper's aim is to present recent combinatorial considerations on r-Dyck paths, r-Parking functions, and the r-Tamari lattices. Giving a better understanding of the combinatorics of these objects has become important in view of their (conjectural) role in the description of the graded character of the Sn-modules of bivariate and trivariate diagonal coinvariant spaces for the symmetric group.Comment: 36 pages, 12 figure

An Assessment of Social Worker Attitudes Regarding the Domestic Sex Trafficking of Children in America

Human sex trafficking, defined as a “modern-day form of slavery in which a commercial sex act is induced by force, fraud, or coercion, or in which the person induced to perform such an act is under the age of 18 years” (USDHHS, 2009) is a problem that many people do not think is issue in America, but in fact is. This study investigated the attitudes of social workers towards domestically sex trafficked children in the United States, as well as towards pimps and johns, and federal and state policies regarding the safety of sex trafficked children. It was hypothesized that social workers who work in child welfare would have a greater knowledge of domestic sex trafficking of children in America than those social workers who work with adults. It was also hypothesized that overall, social workers would have a greater knowledge of international sex trafficking than of domestic sex trafficking. To test these hypotheses, a survey was distributed to 42 social workers at different agencies who were gathered through snowball sampling. Results found that overall, males had a slightly higher opinion of children who were sex trafficked and a lesser opinion of pimps and johns than females. The results found that social workers’ attitudes towards trafficked children and those who traffic them varied among questions, based on the social worker’s field setting. Social workers need to be aware of the impact of sex trafficking so they can advocate for children who have been sex trafficked and so they can provide effective therapeutic services to those effected by sex trafficking