183 citations · 1.4k across the 47 of their papers we have counts for
30 papers · 1 filter
Far Ultraviolet Spectroscopic Explorer Spectroscopy of the Nova-like BB Doradus
P. Godon, E. M. Sion, P. E. Barrett +2
We present an analysis of the Far Ultraviolet Spectroscopic Explorer ({\it{FUSE}}) spectra of the little-known southern nova-like BB Doradus. The spectrum was obtained as part of o…
Investigating ChaMPlane X-ray sources in the Galactic Bulge with Magellan LDSS2 spectra
Xavier Koenig, Jonathan E. Grindlay, Maureen van den Berg +4
We have carried out optical and X-ray spectral analyses on a sample of 136 candidate optical counterparts of X-ray sources found in five Galactic-bulge fields included in our Chand…
Chandra Observations of Type Ia Supernovae: Upper Limits to the X-ray Flux of SN 2002bo, SN 2002ic, SN 2005gj, and SN 2005ke
John P. Hughes, Nikolai Chugai, Roger Chevalier +2
We set sensitive upper limits to the X-ray emission of four Type Ia supernovae (SNe Ia) using the Chandra X-ray Observatory. SN 2002bo, a normal, although reddened, nearby SN Ia, w…
A Silver Anniversary Observation of the X-ray Emitting SN1978K in NGC 1313
E. Lenz, E. M. Schlegel
We describe the results of a 2003 Chandra ACIS-I observation of SN1978K. The spectrum shows little flux below 0.6 keV, in contrast to the 2002 ACIS-S observation that showed flux t…
Polaris: Mass and Multiplicity
Nancy Remage Evans, Gail Schaefer, Howard E. Bond +9
Polaris, the nearest and brightest classical Cepheid, is a member of at least a triple system. It has a wide () physical companion, the F-type dwarf Polaris B. Polaris itself…
A Chandra ACIS Observation of the X-ray Luminous SN1988Z
E. M. Schlegel, R. Petre
SN1988Z is the most luminous X-ray-emitting supernova, initially detected in 1995 using the ROSAT HRI with a luminosity of ~8x10^40 erg s^-1 (Fabian & Terlevich 1996). Its high lum…
Study of Fe K-alpha lines in Non-magnetic Cataclysmic Variables using Chandra HEG data
V. R. Rana, K. P. Singh, E. M. Schlegel +1
Results from a study of Fe K-alpha emission lines for a sample of six non-magnetic Cataclysmic Variables (CVs) using the high resolution X-ray data from the Chandra High Energy Tra…
ChaMPlane Optical Survey: Mosaic Photometry
Ping Zhao, Jonathan E. Grindlay, JaeSub Hong +4
The ChaMPlane survey to identify and analyze the serendipitous X-ray sources in deep Galactic plane fields incorporates the ChaMPlane Optical Survey, which is one of NOAO's Long-te…
Chandra's tryst with SN 1995N
Poonam Chandra, Alak Ray, Eric M. Schlegel +2
We present the spectroscopic and imaging analysis of a type IIn supernova SN 1995N observed with the Chandra X-ray observatory on 2004 March 27. We compare the spectrum obtained fr…
X-ray Outburst in Mira A
M. Karovska, E. Schlegel, W. Hack +1
We report here the Chandra ACIS-S detection of a bright soft X-ray transient in the Mira AB interacting symbiotic-like binary. We resolved the system for the first time in the X-ra…
A Serendipitous XMM-Newton Observation of the Intermediate Polar WX Pyx
Eric M. Schlegel
We briefly describe a serendipitous observation of the little-studied intermediate polar WX Pyx using XMM-Newton. The X-ray spin period is 1557.3 sec, confirming the optical period…
New spectral classification technique for X-ray sources: quantile analysis
Jaesub Hong, Eric M. Schlegel, Jonathan E. Grindlay
We present a new technique called "quantile analysis" to classify spectral properties of X-ray sources with limited statistics. The quantile analysis is superior to the conventiona…
Chandra Observations of Associates of Car: II. Spectra
Nancy Remage Evans, Eric M. Schlegel, Wayne L. Waldron +4
The low resolution X-ray spectra around Car covering Tr 16 and part of Tr 14 have been extracted from a Chandra CCD ACIS image. Various analysis techniques have been applied to…
Periodicities In The X-Ray Intensity Variations of TV Columbae: An Intermediate Polar
V. R. Rana, K. P. Singh, E. M. Schlegel +1
We present results from a temporal analysis of the longest and the most sensitive X-ray observations of TV Columbae--an intermediate polar. The observations were carried out with t…
Chandra ACIS and Newton EPIC Observations of the X-ray Luminous SN1978K in NGC 1313
Eric M. Schlegel, Albert Kong, Philip Kaaret +2
We describe an observation of the X-ray luminous SN1978K in NGC 1313 using the ACIS detector on Chandra and an archival Newton EPIC observation. The models that provided good fits…
Chandra Multi-wavelength Project (ChaMP). II. First Results of X-ray Source Properties
D. -W. Kim, B. J. Wilkes, P. J. Green +15
We present the first results of ChaMP X-ray source properties obtained from the initial sample of 62 observations. The data have been uniformly reduced and analyzed with techniques…
A Chandra Observation of the Diffuse Emission in the Face-on Spiral NGC 6946
E. M. Schlegel, S. S. Holt, R. Petre
This paper describes the {\it Chandra} observation of the diffuse emission in the face-on spiral NGC 6946. Overlaid on optical and H images, the diffuse emission follows the spi…
Hard X-ray Observations of Magnetic Cataclysmic Variables
K. P. Singh, V. R. Rana, K. Mukerjee +2
Hard X-ray light curves and spectral parameters from our analysis of X-ray data of five AM Her type systems - V2301 Oph, V1432 Aql, EP Draconis, GG Leonis, V834 Cen, and one interm…
The Chandra Observation of the IP TX Col
Eric M. Schlegel, Anandi Salinas
We present a preliminary look at the serendipitous observation of the intermediate polar TX Col by Chandra. The 52 ksec observation is uninterrupted, providing an opportunity to di…
Chandra Observations of Associates of Car: I. Luminosities
Nancy Remage Evans, Frederick D. Seward, Miriam I. Krauss +4
The region around the Car nebula has three OB associations, which contain a Wolf-Rayet star and several massive O3 stars. An early Chandra ACIS-I image was centered on Car…
Chandra Observation of the X-Ray Source Population of NGC 6946
S. S. Holt, E. M. Schlegel, U. Hwang +1
We present the results of a study of discrete X-ray sources in NGC 6946 using a deep Chandra ACIS observation. Based on the slope of the log N-log S distribution and the general co…
Upper Limits on the X-ray Emission of "Uranium" Stars
Eric M. Schlegel
A paper by Qian & Wasserburg suggests the optical absorption lines of uranium observed in the spectra of ultra-metal-poor stars (defined as [Fe/H] -3) arise from contamination f…
Initial Optical Results for the ChaMPlane Survey
Ping Zhao, Jonathan Grindlay, Peter Edmonds +5
We provide a brief description of the optical survey being conducted under the NOAO Long Term Surveys program in support of the Chandra Multiwavelength Plane (ChaMPlane) Survey (se…
Chandra Multi-wavelength Plane (ChaMPlane) Survey: Design and Initial Results
Jonathan Grindlay, Ping Zhao, JaeSub Hong +9
The Chandra Multiwavength Plane (ChaMPlane) Survey of the galactic plane incorporates serendipitous sources from selected Chandra pointings in or near the galactic plane (b < 12deg…