Faherty, Jacqueline K., Burgasser, Adam J., West, Andrew A., Bochanski, John J., Cruz, Kelle L., Shara, Michael M., ...
We report on nine wide common proper motion systems containing late-type M, L, or T companions. We confirm six previously reported companions, and identify three new systems. The ages of these...
Carpenter, Kenneth G., Karovska, Margarita, Schrijver, Carolus J., Grady, Carol A., Allen, Ronald J., Brown, Alexander, ...
We summarize some of the compelling new scientific opportunities for understanding stars and stellar systems that can be enabled by sub-mas angular resolution, UV/Optical spectral imaging...
Faherty, Jacqueline K., Burgasser, Adam J., Cruz, Kelle L., Shara, Michael M., Walter, Frederick M., Gelino, Christopher R.
We report proper-motion measurements for 427 late-type M, L, and T dwarfs, 332 of which have been measured for the first time. Combining these new proper motions with previously published...
The 2008 Luminous Optical Transient in the Nearby Galaxy NGC 300 (2009)
Bond, Howard E., Bedin, Luigi R., Bonanos, Alceste Z., Humphreys, Roberta M., Prieto, Jose L., ...
A luminous optical transient (OT) that appeared in NGC 300 in early 2008 had a maximum brightness, M_V ~ -12 to -13, intermediate between classical novae and supernovae. We present ground-based...
"Dark matter" in accretion disks (2008)
Howell, Steve B., Hoard, D. W., Brinkworth, C., Kafka, S., Walentosky, M. J., Walter, Frederick M., ...
Using Spitzer Space Telescope photometric observations of the eclipsing, interacting binary WZ Sge, we have discovered that the accretion disk is far more complex than previously believed. Our 4.5...
Faherty, Jacqueline K., Burgasser, Adam J., Cruz, Kelle L., Shara, Michael M., Walter, Frederick M., Gelino, Christopher R.
We report proper motion measurements for 427 late-type M, L and T dwarfs, 332 of which have been measured for the first time. Combining these new proper motions with previously published measurements...
"Dark Matter" in Accretion Disks (2008)
Howell, Steve B., Hoard, D. W., Brinkworth, C., Walter, Frederick M., Rector, T. A.
Using Spitzer Space Telescope photometric observations of the eclipsing, interacting binary WZ Sge, we have discovered that the accretion disk is far more complex than previously believed. Our 4.5...
Periodic Accretion from a Circumbinary Disk in the Young Binary UZ Tau E (2007)
Jensen, Eric L. N., Dhital, Saurav, Stassun, Keivan G., Patience, Jenny, Herbst, William, Walter, Frederick M., ...
Close pre-main-sequence binary stars are expected to clear central holes in their protoplanetary disks, but the extent to which material can flow from the circumbinary disk across the gap onto the...
Periodic accretion from a circumbinary disk in the young binary UZ Tau E (2007)
Jensen, Eric L. N., Dhital, Saurav, Stassun, Keivan G., Patience, Jenny, Herbst, William, Walter, Frederick M., ...
Close pre-main-sequence binary stars are expected to clear central holes in their protoplanetary disks, but the extent to which material can flow from the circumbinary disk across the gap onto the...
Howell, Steve B., Walter, Frederick M., Harrison, Thomas E., Huber, Mark E., Becker, Robert H., White, Richard L.
EF Eri is a magnetic cataclysmic variable that has been in a low accretion state for the past nine years. Low state optical spectra reveal the underlying Zeeman-split white dwarf absorption lines....
Gerke, Jill R., Howell, Steve B., Walter, Frederick M.
Long term optical and near-infrared photometric and blue spectroscopic observations were obtained for QS Tel, V834 Cen, and BL Hyi. The optical light curves of all three polars displayed large...
The Origins of Fluorescent H2 Emission From T Tauri~Stars (2006)
Herczeg, Gregory J., Linsky, Jeffrey L., Walter, Frederick M., Gahm, Gosta F., Johns-Krull, Christopher M.
We survey fluorescent H2 emission in HST/STIS spectra of the classical T Tauri stars (CTTSs) TW Hya, DF Tau, RU Lupi, T Tau, and DG Tau, and the weak-lined T Tauri star (WTTS) V836 Tau. From each of...
Low Mass Star Formation in the Gum Nebula: The CG~30/31/38 complex (2005)
Kim, Jinyoung Serena, Walter, Frederick M., Wolk, Scott J.
We present photometric and spectroscopic results for the low mass pre-main sequence (PMS) stars with spectral types K - M in the cometary globule (CG) 30/31/38 complex. We obtained multi-object high...
V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months (2004)
Walter, Frederick M., Stringfellow, Guy S., Sherry, William H., Pollatou, Angeliki Field
We report on photometric (BVRIJHK) and low dispersion spectroscopic observations of V1647 Ori, the star that drives McNeil's Nebula, between 10 February and 7 May 2004. The star is photometrically...
Mapping the Circumstellar Environment of T Tauri with Fluorescent H_2 Emission (2003)
Walter, Frederick M., Herczeg, Gregory, Brown, Alexander, Ardila, David R., Gahm, Goesta F., Johns-Krull, Christopher M., ...
We have obtained three long-slit, far UV spectra of the pre-main sequence system T Tauri. These HST/STIS spectra show a strong and variable on-source spectrum composed of both fluoresced H_2 and...
Deconstructing HD 28867 (2002)
Walter, Frederick M., Beck, Tracy L., Morse, Jon A., Wolk, Scott J.
The 3" pair of B9 stars, HD 28867, is one of the brightest X-ray sources in the Taurus-Auriga star forming region. In this multi-wavelength study, we attempt to deduce the source of the X-ray...
A Revised Parallax and its Implications for RX J185635-3754 (2002)
Walter, Frederick M., Lattimer, James
New astrometric analysis of four WFPC2 images of the isolated neutron star RX J185635-3754 show that its distance is 117 +/- 12 pc, nearly double the originally published distance. At the revised...
Observations of T-Tauri Stars using HST-GHRS: II. Optical and Near UV lines (2001)
Ardila, David R., Basri, Gibor, Walter, Frederick M., Valenti, Jeff A., Johns-Krull, Christopher M.
We have analyzed GHRS data of eight Classical T Tauri stars (CTTSs) and one Weak T Tauri star (WTTS). The GHRS data consist of an spectral range 40 A wide centered on 2800 A. For 4 of the CTTS we...
Towards a Mass and Radius Determination of the Nearby Isolated Neutron Star RX J185635-3754 (2001)
Pons, Jose A., Walter, Frederick M., Lattimer, James M., Prakash, Maddapa, Neuhaeuser, Ralph, An, Penghui
We discuss efforts to determine the mass, radius, and surface composition of the nearby compact object RX J185635-3754 from its multi-wavelength spectral energy distribution. We compute...
The Proper Motion, Parallax, and Origin of the Isolated Neutron Star RX J185635-3754 (2000)
The isolated neutron star RX J185635-3754 is the closest known neutron star to the Sun. Based on HST WFPC2 obervations over a 3 year baseline, I report its proper motion (332 +/- 1 mas/yr at a...
NEW INSIGHTS INTO NON-RADIATIVE HEATING IN LATE-A STAR CHROMOSPHERES (1995)
Walter, Frederick M., Matthews, Lynn D., Linsky, Jeffrey L.
Using new and archival spectra from the Goddard High Resolution Spectrograph, we have searched for evidence of chromospheric and transition region emission in six stars of mid- to late-A spectral...