Debra Shepherd -- Science

National Radio Astronomy Observatory

P.O. Box O

Socorro, NM 87801-0387

Phone: (505) 835-7398

FAX: (505) 835-7027

email: dshepher@(delete NO!!SPAM)aoc.nrao.edu

vitae.pdf     Curriculum Vitae

publications.pdf     Publications list

My primary research focuses on a multi-wavelength study of molecular outflows and accretion disks around massive young stellar objects (YSOs). My ultimate goal is to gain a deeper understanding of the outflow powering mechanism by observing outflow/accretion events in systems where higher luminosities and accretion rates may affect the collimation process. To accomplish this, I observe at millimeter, centimeter, and infrared wavelengths to define the characteristics of massive outflows and disks, determine how these compare with low-mass YSO systems and relate the observational properties to theoretical models.

• g34.ApJ_preprint.ps   "Molecular Outflows and a Mid-Infrared Census of the Massive Star-Formation Region Associated with IRAS 18507+0121"; D. S. Shepherd, M. S. Povich, B. A. Whitney, T. P. Robitaille, D. E. A. Nurnberger, L. Bronfman, D. P. Stark, R. Indebetouw, M. R. Meade & B. L. Babler, 2007, ApJ, in press (Oct 2007).
• alma.outflow.review.nov06.ps   "Molecular Outflows Observed with ALMA"; D. S. Shepherd, 2006, to be published in Astrophysics & Space Sciences series, Springer Publishing.
• PP IV & V   Outflow reviews from protostars and planets IV and V by Richer, Shepherd et al. and Arce, Shepherd et al.
• iau227.outflow.review.2005.ps   Massive Molecular Outflows; D. S. Shepherd 2005, Proceeding of the IAU Symposium 227: "Massive Star Birth: A Crossroads of Astrophysics", to be published by Cambridge University Press, eds. R. Cesaroni, E. Churchwell, M. Felli, and C.M. Walmsley. iau227.long_presentation.2005.pdf   The presentation that goes with the review chapter. This is a longer version of the one that I presented at the IAU - It was modified for a colloquium at St. Andrews University, Scotland and has more introduction and explanations.
• porto.review.ps   Precursors of UCHII Regions and the Evolution of Massive Outflows; H. Beuther & D.S. Shepherd 2005, Proceeding of the Porto Conference: "From Cores to Clusters", to be published in a book in the "Astrophysics and Space Science Library Series" under the joint collaboration of Kluwer Academic Publishers and Springer Publishers.
• g192.nh3.h2o.ps   The Circumstellar Environment of the Early B Protostar G192.16-3.84 and the Discovery of a Low-Mass, Protostellar Core; D.S. Shepherd, T. Borders, M. Claussen, Y. Shirley, & S.E. Kurtz 2004, ApJ, 614
• A search for evolved dust in Herbig Ae stars; A. Natta, L. Testi, R. Neri, D.S. Shepherd, D.J. Wilner 2004 A&A, 416, 179   (No re-print available here, please see ADS)
• g34.mm.discovery.ps   Discovery of a Massive Protostar near IRAS 18507+0121; D.S. Shepherd, D.E.A. Nurnberger, & L. Bronfman, 2004, ApJ, 602, 850
• w75n.sio.vla.ps   The Nature of the Massive Young Stars in W75 N; D.S. Shepherd, S. E. Kurtz, & L. Testi, 2004, ApJ, 601, 952
• IRAS 23385+6053: A candidate protostellar massive object; Fontani, F.; Cesaroni, R.; Testi, L.; Walmsley, C. M.; Molinari, S.; Neri, R.; Shepherd, D.; Brand, J.; Palla, F.; Zhang, Q. 2004, A&A, 414, 299   (No re-print available here, please see ADS)
• w75n.outflow.ps   Clustered Star Formation in W75 N; D.S. Shepherd, L. Testi, D.P. Stark, 2003, ApJ, 584, 882-894
• outflow.review.mar02.ps   The Energetics of Outflow and Infall from Low to High-Mass YSOs; D.S. Shepherd, 2003, ASP Conf. Ser. 287; Galactic Star Formation Across the Stellar Mass Spectrum, ed. J.M. De Buizer \& N. S. van der Bliek (San Francisco: ASP), 333
• g173.apj.preprint.ps   A Detailed Study of G173.58+2.45: an Intermediate-Mass Star Forming Region; D.S. Shepherd & A.M. Watson, 2002, ApJ, 566, 966.
• Abstract or Full Text   Evidence for a Solar System Size Accretion Disk Around the Massive Protostar G192.16-3.82; D. S. Shepherd, M. J. Claussen, S. E. Kurtz, 2001; Science Magazine, Volumn 292, Number 5521, Issue of May 25, 2001, pp. 1513-1518. REPRINTS: g192science.ps

• g192.aas2001.ps   Evidence for a Solar System Size Accretion Disk Around the Massive Protostar G192.16-3.82; D. S. Shepherd, M. J. Claussen, S. E. Kurtz, 2001; poster presented at the 2001 AAS meeting, BAAS 132.08

• w75ncont.pp.ps   Warm Dust Emission Near W75 N IRS 1: Evidence for Multiple Energetic Outflows; D.S. Shepherd, ApJ, 546, 345

• apj.iras20126.ps   The Molecular Outflow and Possible Precessing Jet from the Massive Young Stellar Object IRAS~20126+4104; D.S. Shepherd, K. C. Yu, J. Bally, L. Testi, ApJ, 535, 833

• Text: g192disk.pp.ps   A 1000 AU Rotating Disk around the Massive Young Stellar Object G192.16-3.82; D.S. Shepherd & S.E. Kurtz 1999, ApJ, 523, 690
• Figures: g192disk.ppfigs.ps   for G192.16 disk paper (261.9 MB).

• Text: ppiv.final.ps   Molecular Outflows from Young Stellar Objects; J. Richer, D.S. Shepherd, S. Cabrit, R. Bachiller, & E. Churchwell 2000, in "Protostars & Planets IV", ed. V. Mannings, A. Boss, & S. Russell (Tucson: Univ. of Arizona Press, P. 867
• Figures: ppiv.figs.ps   for Protostars and Planets IV review chapter.

• Text: g192mosaic.pp.ps   Outflows and Luminous YSOs: A New Perspective on the G192.16 Massive Bipolar Outflow; D.S. Shepherd, A.M. Watson, A.I. Sargent, & E. Churchwell 1998, ApJ, 507, 861
• Figures: g192mosaic.ppfigs.ps   The G192.16 Massive Bipolar Outflow

• grb_pp2.ps   The Radio Afterglow from GRB 980329; Taylor, Frail, Kulkarni, Shepherd, Feroci, Frontera 1998, ApJL, 502, L115

• grb_pp1.ps   OVRO Observations of GRB 970228 and GRB 970508; Shepherd, Frail, Kulkarni & Metzger 1998, ApJ, 497, 859

• Churchwell 1999,   in ``The Origin of Stars and Planetary Systems'', ed. Charles J. Lada and Nikolaos D. Kylafis (Kluwer Academic Publishers), 515. (Preprint from the Physics of Star Formation and Early Evolution, an invited review given at the NATO Advanced Study Institute, in June 1998 at Crete, Greece)