The Very Short Period M Dwarf Binary SDSS J001641-000925

We present follow-up observations and analysis of the recently discovered short period low-mass eclipsing binary, SDSS J001641-000925. With an orbital period of 0.19856 days, this system has one of the shortest known periods for an M dwarf binary system. Medium-resolution spectroscopy and multi-band photometry for the system are presented. Markov chain Monte Carlo modeling of the light curves and radial velocities yields estimated masses for the stars of M1 = 0.54 +/- 0.07 Msun and M2 = 0.34 +/- 0.04 Msun, and radii of R1 = 0.68 +/- 0.03 Rsun and R2 = 0.58 +/- 0.03 Rsun respectively. This solution places both components above the critical Roche overfill limit, providing strong evidence that SDSS J001641-000925 is the first verified M-dwarf contact binary system. Within the follow-up spectroscopy we find signatures of non-solid body rotation velocities, which we interpret as evidence for mass transfer or loss within the system. In addition, our photometry samples the system over 9 years, and we find strong evidence for period decay at the rate of dP/dt ~8 s/yr. Both of these signatures raise the intriguing possibility that the system is in over-contact, and actively losing angular momentum, likely through mass loss. This places SDSS J001641-000925 as not just the first M-dwarf over-contact binary, but one of the few systems of any spectral type known to be actively undergoing coalescence. Further study SDSS J001641-000925 is on-going to verify the nature of the system, which may prove to be a unique astrophysical laboratory.Comment: 11 figures, ApJ Accepte

Incorporating Intellectual Freedom and Information Literacy into Programming

Raising awareness of intellectual freedom and information literacy is important, and not just during Banned Books Week. Just like sneaking healthy food into a kid’s meal, these techniques for incorporating these topics will enrich the work you already do as a librarian without disrupting your programming routine

The Evolution of Early Literacy: A History of Best Practices in Storytimes”. Children and Libraries: The Journal of the Association for Library Service to Children

The article offers a history of children\u27s library storytimes beginning in the 1940s with particular focus given to best practices. Story selection criteria including rhythm or rhyme and repetition within the text are examined and early values of story hours including playing with others, listening to stories, and looking at picture books are discussed. The role of parents in story hour participation and in emergent literacy is also explored. Early literacy skills and standards promoted in contemporary storytimes are also discussed and include print motivation, phonological awareness, and vocabulary