Search Publications
870 Micron Observations of Nearby 3CRR Radio Galaxies
Quillen, A. C.; Yukita, Mihoko; Almog, Jessica
We present submillimeter continuum observations at 870 µm of the cores of low-redshift 3CRR radio galaxies, observed at the Heinrich Hertz Submillimeter Telescope. The cores are nearly flat-spectrum between the radio and submillimeter, which implies that the submillimeter continuum is likely to be synchrotron emission and not thermal emissio…
Improved Hipparcos Parallaxes of Coma Berenices and NGC 6231
Makarov, Valeri V.
A method to reprocess the Hipparcos Intermediate Astrometry Data that reduces the propagation of the along-scan spacecraft attitude errors was developed and successfully used to obtain a more consistent parallax of the Pleiades (Makarov, published in 2002). The same technique is used now to correct the Hipparcos parallaxes of the Coma Berenices an…
Fragmentation of Globules in H II Regions: Hubble Space Telescope Images of Thackeray's Globules
Reipurth, Bo; Heathcote, Steve; Raga, Alex
We present Hubble Space Telescope WFPC2 images through an Hα filter of Thackeray's globules in the southern H II region IC 2944. The images document the state of the globule complex during its current highly dynamical phase of breakup. A population of very small and short-lived splinters suggests that continuous fragmentation must play an importan…
Upgrades to the Flagstaff Astrometric Scanning Transit Telescope: A Fully Automated Telescope for Astrometry
Harris, Hugh C.; Vrba, Frederick J.; Munn, Jeffrey A. +13 more
The Flagstaff Astrometric Scanning Transit Telescope (FASTT) is a fully automated telescope that takes about 41,000 CCD frames of data a year for various research projects. All aspects of the telescope's operation have been automated (e.g., target selection, observing, reduction of data, and collation of results), and manpower needs are now under …
The Long Aftermath of Superoutbursts: STIS Results on AL Comae 5.5 Years Past Outburst
Szkody, Paula; Howell, Steve B.; Sion, Edward M. +2 more
The Space Telescope Imaging Spectrograph (STIS) was used to obtain the ultraviolet spectrum of AL Comae 5.5 yr past its 1995 April superoutburst. The spectrum can be fitted by a model of a logg=8+/-0.5 white dwarf with a temperature of 16,300+/-1000 K. Surprisingly, the flux distribution is exactly the same as the Faint Object Spectrograph data ob…
Star-Forming Knots in the UV-Bright Interacting Galaxies NGC 3395 and NGC 3396
Hancock, Mark; Nelson, Charles H.; Weistrop, Donna +1 more
We have obtained ultraviolet and visible wavelength images for the central regions of the interacting galaxies NGC 3395 and NGC 3396, using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The images show many isolated sources of ultraviolet emission produced by young star-forming regions (knots). The FWHM of most of the kno…
An Astrometric Study of the Low-Mass Binary Star Ross 614
Han, Inwoo; Gatewood, George; Coban, Louis
Long accepted as the quintessential low-mass star, the secondary of the nearby diminutive astrometric binary Ross 614 has attracted considerable astrophysical interest. Unfortunately, the orbital period of 16.6 yr exceeds the duration of the mission-limited studies of most space-borne or instrumental-proving observational programs. As with most su…
Deconstructing HD 28867
Walter, Frederick M.; Wolk, Scott J.; Morse, Jon A. +1 more
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 multiwavelength study, we attempt to deduce the source of the X-ray emission. We show that the east component is the X-ray source. The east component has a near-IR excess and displays narrow absorption lines in the optical, both…
Far-Ultraviolet Observations of the Circumstellar Gas in the 2 Andromedae System
Neff, James E.; Cheng, K. -P.
The A5 star β Pictoris is a possible young planetary system and has the best-studied circumstellar disk. Our visible and ultraviolet observations of 2 Andromedae indicated that this A3 star has β Pictoris-like gas infall. We present the far-ultraviolet spectrum (905-1195 Å) of 2 And we obtained with the NASA-CNES-CSA Far Ultraviolet Spectroscopic …
Maffei 1 with the Hubble Space Telescope
McCall, Marshall L.; Buta, R.
High-resolution R, I, and Hα images of the center of Maffei 1, the nearest normal giant elliptical galaxy (M0V=-20.9), have been acquired with the Hubble Space Telescope. At its distance of 3.0 Mpc, 1 pixel in the Planetary Camera field covers only 0.66 pc. The observations reveal that Maffei 1 is a ``core type'' elliptical g…