Rafelski, Marc, Wolfe, Arthur M., Cooke, Jeff, Chen, Hsiao-Wen, Armandroff, Taft E., Wirth, Gregory D.
We present a sample of 407 z~3 Lyman break galaxies (LBGs) to a limiting isophotal u-band magnitude of 27.6 mag in the Hubble Ultra Deep Field (UDF). The LBGs are selected using a combination of...
Kitt Peak National Observatory, National Optical Astronomy Observatories, (2007)
Box Tucson, Taft E. Armandroff, James E. Davies, George H. Jacoby
. By applying a digital filtering technique to 1550 deg 2 of the POSS-II in the vicinity of M31, we found two previously unidentified very low surface brightness dwarf galaxies which we designate And...
The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda I and Andromeda III (2005)
Pritzl, Barton J., Armandroff, Taft E., Jacoby, George H., Da Costa, G. S.
(Abridged) We present the results of variable star searches of the M31 dwarf spheroidal companions Andromeda I and Andromeda III using the Hubble Space Telescope. A total of 100 variable stars were...
The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda II (2003)
Pritzl, Barton J., Armandroff, Taft E., Jacoby, George H., Da Costa, G. S.
(abridged) We present the results of a variable star search in Andromeda II, a dwarf spheroidal galaxy companion to M31, using HST/WFPC2 observations. Seventy-three variables were found, one of which...
The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda VI (2002)
Pritzl, Barton J., Armandroff, Taft E., Jacoby, George H., Da Costa, Gary S.
We have surveyed Andromeda VI, a dwarf spheroidal galaxy companion to M31, for variable stars using F450W and F555W observations obtained with the Hubble Space Telescope. A total of 118 variables...
Structure of the Draco Dwarf Spheroidal Galaxy (2002)
Piatek, Slawomir, Pryor, Carlton, Armandroff, Taft E., Olszewski, Edward W.
This article studies the structure of the Draco dwarf spheroidal galaxy with an emphasis on the question of whether the spatial distribution of its stars has been affected by the tidal interaction...
Surface Photometry of Star Clusters in the Dwarf Elliptical Galaxies NGC 185 and NGC 205 (2001)
Kim, Sang Chul, Lee, Myung Gyoon, Geisler, Doug, Sarajedini, Ata, Armandroff, Taft E., Da Costa, Gary S.
We present the surface photometry of star clusters in the nearby dwarf elliptical galaxies NGC 185 and NGC 205, obtained from deep HST WFPC2 F555W (V) and F814W (I) images. We have obtained surface...
Stars of the Draco Dwarf Spheroidal Galaxy Beyond its Measured Tidal Boundary (2000)
Piatek, Slawomir, Pryor, Carlton, Armandroff, Taft E., Olszewski, Edward W.
We report R- and V-band photometry derived from CCD imaging for objects in nine fields in and around the Draco dwarf spheroidal galaxy. The most distant fields are about 1.3 degrees from the center....
The Age of the Inner Halo Globular Cluster NGC 6652 (2000)
Chaboyer, Brian, Sarajedini, Ata, Armandroff, Taft E.
HST (V,I) photometry has been obtained for the inner halo globular cluster NGC 6652. The photometry reaches approximately 4 mag below the turn-off and includes a well populated horizontal branch....
Burris, Debra L., Pilachowski, Catherine A., Armandroff, Taft E., Sneden, Christopher, Cowan, John J.
New abundances for neutron-capture (n-capture) elements in a large sample of metal-poor giants from the Bond survey are presented. The spectra were acquired with the KPNO 4-m echelle and coude feed...
Armandroff, Taft E., Jacoby, George H., Davies, James E.
We present B-, V-, and I-band images, as well as an H alpha image, of And VI. This is the second newly identified dwarf spheroidal (dSph) companion to M31 found using a digital filtering technique...
The Andromeda Dwarf Spheroidal Galaxies (1998)
Armandroff, Taft E., Da Costa, Gary S.
Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal...
A Survey for Low Surface Brightness Dwarf Galaxies Around M31 (1998)
Armandroff, Taft E., Davies, James E., Jacoby, George H.
By applying a digital filtering technique to 1550 square degrees of the POSS-II in the vicinity of M31, we found two previously unidentified very low surface brightness dwarf galaxies which we...
Armandroff, Taft E., Davies, James E., Jacoby, George H.
We present images and a color-magnitude diagram for And V, a new dwarf spheroidal companion to M31 that was found using a digital filtering technique applied to 1550 square degrees of the second...
Caldwell, Nelson, Armandroff, Taft E., Da Costa, G. S., Seitzer, Patrick
We have obtained HST WFPC2 images through the F555W and F814W filters of two M81 group dE's: BK5N and a new system, designated F8D1. The resulting color-magnitude diagrams show the upper two...