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1. Stellar activity as noise in exoplanet detection II. Application to M dwarfs

Author

Andersen, Jan Marie and Korhonen, Heidi

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

The ubiquity of M dwarf stars combined with their low masses and luminosities make them prime targets in the search for nearby, habitable exoplanets. We investigate the effects of starspot-induced radial velocity (RV) jitter on detection and characterization of planets orbiting M dwarfs. We create surface spot configurations with both random spot coverage and active regions. Synthetic stellar spectra are calculated from a given spot map, and RV measurements are obtained using cross-correlation technique. We add the RV signal of an orbiting planet to these jitter measurements, and reduce the data to "measure" the planetary parameters. We investigate the detectability of planets around M dwarfs of different activity levels, and the recovery of input planetary parameters. When studying the recovery of the planetary period we note that while our original orbital radius places the planet inside the HZ of its star, even at a filling factor of 2% a few of our measurements fall outside the "conservative Habitable Zone". Higher spot filling factors result in more and higher deviations. Our investigations suggest that caution should be used when characterizing planets discovered with the RV method around stars that are (or are potentially) active., Comment: 20 pages (2 columns), 19 figures, accepted for publication in MNRAS

Published
2015
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2. The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data

Author

West, Andrew A., Morgan, Dylan P., Bochanski, John J., Andersen, Jan Marie, Bell, Keaton J., Kowalski, Adam F., Davenport, James R. A., Hawley, Suzanne L., Schmidt, Sarah J., Bernat, David, Hilton, Eric J., Muirhead, Philip, Covey, Kevin R., Rojas-Ayala, Barbara, Schlawin, Everett, Gooding, Mary, Schluns, Kyle, Dhital, Saurav, Pineda, J. Sebastian, and Jones, David O.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

We present a spectroscopic catalog of 70,841 visually inspected M dwarfs from the seventh data release of the Sloan Digital Sky Survey (SDSS). For each spectrum, we provide measurements of the spectral type, a number of molecular bandheads, and the H-alpha, H-beta, H-gamma, H-delta and Ca II K emission lines. In addition, we calculate the metallicity-sensitive parameter zeta and identify a relationship between zeta and the g-r and r-z colors of M dwarfs. We assess the precision of our spectral types (which were assigned by individual examination), review the bulk attributes of the sample, and examine the magnetic activity properties of M dwarfs, in particular those traced by the higher order Balmer transitions. Our catalog is cross-matched to Two Micron All Sky Survey (2MASS) infrared data, and contains photometric distances for each star. Lastly, we identify eight new late-type M dwarfs that are possibly within 25 pc of the Sun. Future studies will use these data to thoroughly examine magnetic activity and kinematics in late-type M dwarfs and examine the chemical and dynamical history of the local Milky Way., Comment: 14 pages, 10 figures, 5 tables (in emulateapj format), accepted for publication in the Astronomical Journal

Published
2011
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3. The Sloan Digital Sky Survey Data Release 7 M Dwarf Spectroscopic Catalog

Author

West, Andrew A., Morgan, Dylan P., Bochanski, John J., Andersen, Jan Marie, Bell, Keaton J., Kowalski, Adam F., Davenport, James R. A., Hawley, Suzanne L., Schmidt, Sarah J., Bernat, David, Hilton, Eric J., Muirhead, Philip, Covey, Kevin R., Rojas-Ayala, Barbara, Schlawin, Everett, Gooding, Mary, Schluns, Kyle, Dhital, Saurav, Pineda, J. Sebastian, and Jones, David O.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

We present a spectroscopic catalog of 70,841 visually inspected M dwarfs from the seventh data release (DR7) of the Sloan Digital Sky Survey (SDSS). For each spectrum, we provide measurements of the spectral type, a number of molecular bandheads, and the H-alpha, H-beta, H-gamma, H-delta and Ca II K emission lines. In addition, we calculate the metallicity-sensitive parameter zeta and 3D space motions for most of the stars in the sample. Our catalog is cross-matched to Two Micron All Sky Survey (2MASS) infrared data, and contains photometric distances for each star. Future studies will use these data to thoroughly examine magnetic activity and kinematics in late-type M dwarfs and examine the chemical and dynamical history of the local Milky Way., Comment: 4 pages, 1 figure, to appear in online version of the Cool Stars 16 conference proceedings

Published
2010

4. Negotiating Meaning with Educational Practice: Alignment of Preservice Teachers' Mission, Identity, and Beliefs with the Practice of Collaborative Action Research

Author

Carpenter, Jan Marie

Abstract

The case studies examined how three preservice teachers within a Master of Arts in Teaching program at a small, private university negotiated meaning around an educational practice--collaborative action research. Preservice teachers must negotiate multiple, and often competing, internal and external discourses as they "sort out" what educational practices, policies, organizational structures to accept or reject as presented in the teacher education program. This negotiation is a dynamic, contextual, unique meaning-making process that extends, redirects, dismisses, reinterprets, modifies, or confirms prior beliefs (Wenger, 1998). Korthagen's (2004) model for facilitating understanding and reflection was used to explore the process of negotiating meaning. Known as the Onion Model, it includes six levels: the environment, behavior, competencies, beliefs, identity, and mission. When alignment occurs between all levels, Korthagen explained that individuals experience wholeness, energy, and presence. In contrast, tensions can occur within a level or between levels of the Onion Model and limit the effectiveness of the preservice teacher regarding the area in question. Reflecting on the collaborative action research experience through the layers of the Korthagen's model may allow preservice teachers (and professors) to identify degrees of alignment and areas of tension as preservice teachers negotiate meaning. Once identified, areas of tension can be deconstructed and better understood; self-understanding can empower individuals to assume an active and powerful role in their professional developmental. To explore how preservice teachers negotiated their identity regarding collaborative action research, the following research questions guided the study: (1) How do preservice teachers' trajectories align with the practice of collaborative action research? (2) How do individuals negotiate meaning regarding the practice of collaborative action research? (3) How do preservice teachers frame collaborative action research in relation to their future practice? Triangulated data from interviews, observations, and document analysis was collected, analyzed, and interpreted to provide insight into preservice teachers' process of negotiating meaning around a nontraditional educational practice. Each participant traveled a unique and emotional journey through the process of collaborative action research and their personal trajectory did influence the way they negotiated the practice of collaborative action research. Findings included: (a) each participant had a dominant trait that influenced areas of alignment and misalignment between their trajectory and the practice of collaborative action research; (b) some participants exhibited visible misalignments while the misalignments of others were hidden; (c) participants relied on personal strengths to reestablish the perception of alignment as they negotiated meaning through the practice of collaborative action research; (d) the way misalignments were negotiated limited the transformational potential of the learning experience of collaborative action research; and (e) participants' expectations for their future use of the practice of collaborative action research aligned with their dominant traits. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]

Published
2010

5. Economic policy.

Subjects
FRENCH economic policy, BENCHMARKING (Management)
Abstract

Reports developments in the economic policy of France as of January 2000. Includes the increase of the European Central Bank (ECP) benchmark; Support of France Finance Minister Christian Sautter to the move of the ECB; Provision of financial incentives for companies; Controversy over the use of social security funds.

Published
2000

19. Advancing Our National Agenda. Proceedings of the National Conference on Adult and External Degree Programs (8th, Washington, D.C., October 12-14, 1988).

Author

American Council on Education, Washington, DC.

Abstract

A comprehensive, interactive conference was designed to help improve the quality of external degree programs and adult education. Sixteen papers are presented as follows: (1) "Designing Self-Instructional Print Material for the Adult Learner" (Diane J. Davis); (2) "Degrees by Alternative Delivery for U.S. Soldiers and Sailors" (Clinton L. Anderson); (3) "Quality and Assessment Issues in Graduate Education External Degree Programs" (Jules O. Pagano); (4) "Model Policy on Awarding Credit for Extrainstitutional Learning" (Henry A. Spille); (5) "A Model for Graduate Education in Ministry by Extension: The Loyola Institute for Ministry Extension Program" (Marcel J. Dumestre and Barbara J. Fleischer); (6) "Affecting Retention in a Non-Instructional Degree Program" (Thomas A. Wright and Jan-Marie A. Spanard); (7) "The Cultural Context of Adult Education and the Principle of Dialogue" (Lee W. Herman); (8) "Developing Collaborative Academic Partnerships: A Strategy for Advancing our National Economic Competitiveness Agenda" (Sonja A. Eveslage and Iris Saltiel); (9) "Adult Students, Technology, and General Education: New Tools for Curriculum Reform" (Gary E. Miller); (10) "A Sense of Strategy: Adult Student Writers and the World of Work" (Gail Hall); (11) "Intensive Time Formats in Adult External Degree Programs" (E. Gary Shapiro and Julia A. Daniels); (12) "Renovating Innovation: The Challenge of Maturity in the Innovative College" (Douglas B. Johnstone); (13) "Innovation: The Conflict Between Freedom and Structure" (Michael Andolina); (14) "Opening Minds Through the Liberal Arts in an Adult Degree Program" (Mary-Curt Browning and Judith K. McCormick); (15) "It's No Party but--Adult Students as Guests (Colleges as Hosts)" (Barbara Cherem); and (16) "Orientation of Adults to College Content and Outcomes of a Re-Entry Course" (Elizabeth Steltenpohl and Jane Shipton). (SM)

Published
1988

20. Shaping a Cohesive Agenda: Next Steps. National Conference on Adult and External Degree Programs. (7th, Memphis, Tennessee, October 7-10, 1987).

Author

Alliance, an Association for Alternative Degree Programs. and American Council on Education, Washington, DC.

Abstract

Proceedings of an international conference on adult and external degree programs are presented. Selected papers are drawn from the areas of distance learning, support services, intra-institutional, curriculum, and teaching. They include: "Uses of Distance Education for Graduate Professional Degrees" (Ruth J. Person and Raymond Vondran); "Library Services of Off-Campus Programs" (William Aguilar, Marie Kascus, and Doris R. Brown); "Reducing Opposition in the University" (Joseph Baglio); "Integrating the Teaching of Thinking, Writing and Math Reasoning into Distance Learning" (Dan A. Davis); "The Capstone Student: Breaking Boundaries and Building Bridges Intra-Institutionally" (Robert Carter); "Students: An Untapped Resource for Adult Programs" (Thomas E. McDuffie); "Quality in Off-Campus Videobased Graduate Technical Education" (Stanley A. Huffman and Harvey R. Stone); "Demonstration of Baccalaureate-Level Competency" (Thomas Taaffe and Lenore Burgard); "Building Faculty Consensus at a Distance" (Judy Deleau); "Non-Traditional Programs: The Programs People Love to Hate" (Colin Silverthorne); "Orienting the Adult Learner" (John C. Adams, Daniel Fulks, and Norma J. Strickland); "Overarching Themes: An Approach to Curriculum Design" (Sarah Evans); "Articulation of Proprietary Schools and College: A Model" (Terry Dunford); "Program Enhancement through Publications" (John Walter Mey); "Contextual Knowing: Teaching Strategies for Adults" (Donald B. Pribor); "Curricula for Mid-Career Professionals" (Merl Baker); "Research in Distance Learning" (Bobbi L. Kamil, Joyce Nielsen, James F. Niss, and Paul W. Grimes); "Marketing to Adult Learners" (Nancie Thole, Sharon O'Brien, and Susan English); "Advisement of Adult Learners: Research from the Field" (Jan-Marie Spanard and Ulestine Watson); "Curricular Innovation in Graduate Professional Education: The Balance with Liberal Learning" (Jean W. Knoll and Catherine Marineau); "Archiving as Means to Study Teaching" (Sharon E. Simone); "New Opportunities in Distance Learning" (Daniel Granger and Michael F. Beaudoin); "Teaching Adult Teachers about Teaching Adult Learners" (Jack Hirschfeld); "Silicon and Ivy: New Pathways to Higher Education" (William J. Seaton); "Models of Individualized Degree Programs" (Kent Warren); "External Degree Programs: Lessons from Experience" (Anna Bolling, Earl Hausle, and Karla M. Klinger); and Transcripting of Non-Traditional or Extra-Institutional Credits" (Marie Redwine). Author and institution indexes are provided. Contains references throughout. (KM)

Published
1987

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