Stellar Clusters in the NGC 6334 Star Forming Complex (2009)
Feigelson, Eric D., Martin, Amanda L., McNeill, Collin J., Broos, Patrick S., Garmire, Gordon P.
The full stellar population of NGC 6334, one of the most spectacular regions of massive star formation in the nearby Galaxy, have not been well-sampled in past studies. We analyze here a mosaic of...
Protoplanetary Disk Evolution around the Triggered Star Forming Region Cepheus B (2009)
Getman, Konstantin V., Feigelson, Eric D., Luhman, Kevin L., Sicilia-Aguilar, Aurora, Wang, Junfeng, Garmire, Gordon P.
The Cepheus B (CepB) molecular cloud and a portion of the nearby CepOB3b OB association, one of the most active regions of star formation within 1 kpc, have been observed with the IRAC detector on...
Wang, Junfeng, Feigelson, Eric D., Townsley, Leisa K., Roman-Zuniga, Carlos G., Lada, Elizabeth, Garmire, Gordon
We explore here the young stellar populations in the Rosette Molecular Cloud (RMC) region with high spatial resolution X-ray images from the Chandra X-ray Observatory, which are effective in locating...
Statistics in astronomy (2009)
Perhaps more than other physical sciences, astronomy is frequently statistical in nature. The objects under study are inaccessible to direct manipulation in the laboratory, so the astronomer is...
X-ray flares in Orion young stars. I. Flare characteristics (2008)
Getman, Konstantin V., Feigelson, Eric D., Broos, Patrick S., Micela, Giuseppina, Garmire, Gordon P.
Pre-main sequence (PMS) stars are known to produce powerful X-ray flares which resemble magnetic reconnection solar flares scaled by factors up to 10^4. However, numerous puzzles are present...
X-Ray flares in Orion Young Stars. II. Flares, Magnetospheres, and Protoplanetary Disks (2008)
Getman, Konstantin V., Feigelson, Eric D., Micela, Giuseppina, Jardine, Moira M., Gregory, Scott G., Garmire, Gordon P.
We study the properties of powerful X-ray flares from 161 pre-main sequence (PMS) stars observed with the Chandra X-ray Observatory in the Orion Nebula region. Relationships between flare properties,...
A SENSITIVE 1.5 GHz RADIO SURVEY AROUND THE NORTH ECLIPTIC POLE (2007)
Ronald Kollgaard Wolfgang, Margaret Mcmath Chester, Eric D. Feigelson, Patricia Reich, Richard Wielebinski
A 29.3 square degree region surrounding the North Ecliptic Pole (NEP; ff = 18 h 00 m , ffi = +66 ffi 30 0 ) was mapped with the Very Large Array at 1.5 GHz to support the deepest portion of the ROSAT...
A Sample Of Astronomical Time Series (2007)
Paul Hertz Hulburt, Eric D. Feigelson
The observation of variability in astronomical systems provides astronomers with valuable information on the physical nature of the system. The types of variability which astronomers deal with can be...
Wang, Junfeng, Townsley, Leisa K., Feigelson, Eric D., Broos, Patrick S., Getman, Konstantin V., Roman-Zuniga, Carlos, ...
We present the first high spatial resolution Chandra X-ray study of NGC 2244, the 2 Myr old stellar cluster immersed in the Rosette Nebula. Over 900 X-ray sources are detected; 77% have optical or...
The Diverse Stellar Populations of the W3 Star Forming Complex (2007)
Feigelson, Eric D., Townsley, Leisa K.
An 800 sq-arcmin mosaic image of the W3 star forming complex obtained with the Chandra X-ray Observatory gives a valuable new view of the spatial structure of its young stellar populations. The...
The young stellar population in M17 revealed by Chandra (2006)
Broos, Patrick S., Feigelson, Eric D., Townsley, Leisa K., Getman, Konstantin V., Wang, Junfeng, Garmire, Gordon P., ...
We report here results from a Chandra ACIS observation of the stellar populations in and around the Messier 17 H II region. The field reveals 886 sources, 771 of which have stellar counterparts in...
A Re-appraisal of the Habitability of Planets Around M Dwarf Stars (2006)
Tarter, Jill C., Backus, Peter R., Mancinelli, Rocco L., Aurnou, Jonathan M., Backman, Dana E., Basri, Gibor S., ...
Stable, hydrogen-burning, M dwarf stars comprise about 75% of all stars in the Galaxy. They are extremely long-lived and because they are much smaller in mass than the Sun (between 0.5 and 0.08...
An X-ray Census of Young Stars in the Massive Southern Star-Forming Complex NGC 6357 (2006)
Wang, Junfeng, Townsley, Leisa K., Feigelson, Eric D., Getman, Konstantin V., Broos, Patrick S., Garmire, Gordon P., ...
We present the first high spatial resolution X-ray study of the massive star forming region NGC 6357, obtained in a 38 ks Chandra/ACIS observation. Inside the brightest constituent of this large HII...
X-ray Study of Triggered Star Formation and Protostars in IC 1396N (2006)
Getman, Konstantin V., Feigelson, Eric D., Garmire, Gordon, Broos, Patrick, Wang, Junfeng
The IC 1396N cometary globule within the large nearby HII region IC 1396 has been observed with the ACIS detector on board the Chandra X-ray Observatory. We detect 117 X-ray sources, of which ~50-60...
X-rays from HH210 in the Orion nebula (2006)
Grosso, Nicolas, Feigelson, Eric D., Getman, Konstantin V., Kastner, Joel H., Bally, John, McCaughrean, Mark J.
We report the detection during the Chandra Orion Ultradeep Project (COUP) of two soft, constant, and faint X-ray sources associated with the Herbig-Haro object HH210. HH210 is located at the tip of...
Getman, Konstantin V., Feigelson, Eric D., Townsley, Leisa, Broos, Patrick, Garmire, Gordon, Tsujimoto, Masahiro
Cepheus B (Cep B) molecular cloud and a portion of the nearby Cep OB3b OB association, one of the most active regions of star formation within 1 kpc, has been observed with the ACIS detector on board...
X-ray Emission from Orion Nebula Cluster Stars with Circumstellar Disks and Jets (2005)
Kastner, Joel H., Franz, Geoffrey, Grosso, Nicolas, Bally, John, McCaughrean, Mark J., Getman, Konstantin, ...
We investigate the X-ray and near-infrared emission properties of a sample of pre-main sequence (PMS) stellar systems in the Orion Nebula Cluster (ONC) that display evidence for circumstellar disks...
The Origin of T Tauri X-ray Emission: New Insights from the Chandra Orion Ultradeep Project (2005)
Preibisch, Thomas, Kim, Yong -Cheol, Favata, Fabio, Feigelson, Eric D., Flaccomio, Ettore, Getman, Konstantin, ...
We use the data of the Chandra Orion Ultradeep Project (COUP) to study the nearly 600 X-ray sources that can be reliably identified with optically well characterized T Tauri stars (TTS) in the Orion...
Global X-ray properties of the Orion Nebula region (2005)
Feigelson, Eric D., Getman, Konstantin, Townsley, Leisa, Garmire, Gordon, Preibisch, Thomas, Grosso, Nicolas, ...
Based on the Chandra Orion Ultradeep Project (COUP) observation, we establish the global X-ray properties of the stellar population associated with the Orion Nebula. Three components contribute...
The evolution of X-ray emission in young stars (2005)
Preibisch, Thomas, Feigelson, Eric D.
We study the relation between age and magnetic activity in late-type pre-main sequence (PMS) stars, for the first time using mass-stratified subsamples. The effort is based on the Chandra Orion...
X-ray emission from young brown dwarfs in the Orion Nebula Cluster (2005)
Preibisch, Thomas, McCaughrean, Mark J., Grosso, Nicolas, Feigelson, Eric D., Flaccomio, Ettore, Getman, Konstantin, ...
We use the sensitive X-ray data from the Chandra Orion Ultradeep Project (COUP) to study the X-ray properties of 34 spectroscopically-identified brown dwarfs with near-infrared spectral types between...
X-rays and young clusters: Membership, IMFs and distances (2005)
Feigelson, Eric D., Getman, Konstantin V.
Sensitive imaging X-ray observations of young stellar clusters (YSCs, ages less than about 10 Myr) are valuable tools for the acquisition of an unbiased census of cluster members needed for Initial...
An X-ray census of young stars in the Chamaeleon I North cloud (2004)
Feigelson, Eric D., Lawson, Warrick A.
Sensitive X-ray imaging surveys provide a new and effective tool to establish the census of pre-main sequence (PMS) stars in nearby young stellar clusters. We report here a deep Chandra X-ray...
Li, Jingqiang, Kastner, Joel H., Prigozhin, Gregory Y., Schulz, Norbert S., Feigelson, Eric D., Getman, Konstantin V.
We further investigate subpixel event repositioning (SER) algorithms in application to Chandra X-ray Observatory (CXO) CCD imaging. SER algorithms have been applied to backside illuminated (BI)...
Li, Jingqiang, Kastner, Joel, Prigozhin, Gregory Y., Schulz, Norbert S., Feigelson, Eric D., Getman, Konstantin V.
Also archived in: arXiv:astro-ph/0401592v1
Population and dynamical state of the eta Chamaeleontis sparse young open cluster (2003)
Lyo, A-Ran, Lawson, Warrick A., Feigelson, Eric D., Crause, Lisa A.
We report new results in our continuing study of the unique compact (1 pc extent), nearby (d = 97 pc), young (t = 9 Myr) stellar cluster dominated by the B9 star eta Chamaeleontis. An optical...
Feigelson, Eric D., Lawson, Warrick A., Garmire, Gordon P.
We present the outcomes of a Chandra X-ray Observatory snapshot study of five nearby Herbig Ae/Be (HAeBe) stars which are kinematically linked with the Oph-Sco-Cen Association (OSCA). Optical...
Coronal X-ray emission from an intermediate-age brown dwarf (2003)
Tsuboi, Yohko, Maeda, Yoshitomo, Feigelson, Eric D., Garmire, Gordon P., Chartas, George, Mori, Koji, ...
We report the X-ray detection of the brown dwarf (BD) companion TWA 5B in a $\simeq 12$ Myr old pre-main sequence binary system. We clearly resolve the faint companion (35 photons) separated from the...
Feigelson, Eric D., Gaffney III, James A., Garmire, Gordon, Hillenbrand, Lynne A., Townsley, Leisa
A recent Chandra/ACIS observation of the Orion Nebula Cluster detected 1075 sources (Feigelson et al. 2002), providing a uniquely large and well-defined sample to study the dependence of magnetic...
Infrared study of the eta Chamaeleontis cluster and the longevity of circumstellar discs (2002)
Lyo, A-Ran, Lawson, Warrick A., Mamajek, Eric M., Feigelson, Eric D., Sung, Eon-Chang, Crause, Lisa A.
We have analyzed JHKL observations of the stellar population of the ~9 Myr-old eta Chamaeleontis cluster. Using infrared (IR) colour-colour and colour-excess diagrams, we find the fraction of stellar...
Chandra Study of Young Stellar Objects in the NGC 1333 Star-forming Cloud (2002)
Getman, Konstantin V., Feigelson, Eric D., Townsley, Leisa, Bally, John, Lada, Charles J., Reipurth, Bo
NGC 1333, a highly active star formation region within the Perseus molecular cloud complex, has been observed with the ACIS-I detector on board the Chandra X-ray Observatory. In our image with a...
X-ray emitting young stars in the Orion Nebula (2002)
Feigelson, Eric D., Broos, Patrick, Gaffney III, James A., Garmire, Gordon, Hillenbrand, Lynne A., Pravdo, Steven H., ...
The Orion Nebula Cluster and the molecular cloud in its vicinity have been observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23 hours exposure. We detect 1075 X-ray...
Discovery of Soft X-Ray Emission from Io, Europa and the Io Plasma Torus (2002)
Elsner, Ronald F., Gladstone, G. Randall, Waite, J. Hunter, Crary, Frank J., Howell, Robert R., Johnson, Robert E., ...
We report the discovery of soft (0.25--2 keV) x-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (>10 keV) H,...
Magnetic flaring in the pre-main sequence Sun and implications for the early solar system (2002)
Feigelson, Eric D., Garmire, Gordon P., Pravdo, Steven H.
To address the role of energetic processes in the solar nebula, we provide a detailed characterization of magnetic flaring in stellar analogs of the pre-main sequence Sun based on 23 hours...
Discovery of soft X-ray emission from Io, Europa, and the Io Plasma Torus (2002)
Elsner, Ronald F., Gladstone, G. Randall, Waite, J. Hunter, Crary, Frank J., Howell, Robert R., Johnson, Robert E., ...
We report the discovery of soft (0.25-2 keV) X-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (greater than...
Lawson, Warrick A., Crause, Lisa A., Mamajek, Eric E., Feigelson, Eric D.
A limited-area survey of the eta Chamaeleontis cluster has identified 2 new late-type members. The more significant of these is ECHA J0843.3-7905 (= IRAS F08450-7854), a slowly-rotating (P = 12 d) M2...
Detection of Nuclear X-ray Sources in Nearby Galaxies with Chandra (2001)
Ho, Luis C., Feigelson, Eric D., Townsley, Leisa K., Sambruna, Rita M., Garmire, Gordon P., Brandt, W. N., ...
We report preliminary results from an arcsecond-resolution X-ray survey of nearby galaxies using ACIS on board Chandra. The total sample consists of 41 low-luminosity AGNs, including Seyferts,...
Magnetic flaring in pre-main sequence stars (2001)
Observations of nearby star forming clouds with imaging X-ray telescopes have revealed that X-ray emission is elevated $10^1-10^4$ above main sequence levels in low-mass pre-main sequence (PMS)...
Chandra studies of star forming regions (2000)
When observed with sufficiently high spatial resolution and sensitivity, star formation regions are unusually complex X-ray sources. Low-mass protostars and T Tauri stars, Herbig Ae/Be stars, OB and...
The Orion Star-Forming Region (2000)
Hillenbrand, Lynne A., Carpenter, John M., Feigelson, Eric D.
General properties of the Orion star-forming region are discussed, with a focus on the dense Orion Nebula Cluster (ONC). This cluster contains between 2500 and 4500 objects located within a few...
Chandra X-ray Observatory Study of the Orion Nebula Cluster and BN/KL Region (2000)
Garmire, Gordon, Feigelson, Eric D., Broos, Patrick, Hillenbrand, Lynne A., Pravdo, Steven H., Townsley, Leisa, ...
About 1000 X-ray emitting young pre-main sequence (PMS) stars distributed in mass from 0.05 to 50 solar masses are detected in an image of the Orion Nebula obtained with the Advanced CCD Imaging...
The Eta Chamaeleontis Cluster: Origin in the Sco-Cen OB Association (2000)
Mamajek, Eric E., Lawson, Warrick A., Feigelson, Eric D.
A young, nearby compact aggregate of X-ray emitting pre-main sequence stars was recently discovered in the vicinity of eta Cha (B8V). In this paper, we further investigate this cluster: its...
Grosso, Nicolas, Montmerle, Thierry, Bontemps, Sylvain, Andre, Philippe, Feigelson, Eric D.
We have obtained two deep exposures of the rho Oph cloud core region with the ROSAT HRI. The improved position accuracy (1"-6") with respect to previous recent X-ray observations (ROSAT PSPC, and...
Three types of gamma-ray bursts (1998)
Mukherjee, Soma, Feigelson, Eric D., Babu, Gutti Jogesh, Murtagh, Fionn, Fraley, Chris, Raftery, Adrian
A multivariate analysis of gamma-ray burst (GRB) bulk properties is presented to discriminate between distinct classes of GRBs. Several variables representing burst duration, fluence and spectral...
X-ray imaging observations of the radio galaxies Cen A, Vir A, and 3C273 / (1980)
Thesis (Ph. D.)--Harvard University, 1980.
X-ray imaging observations of the radio galaxies CEN A, VIR A, and 3C273. (1980)
University Microfilms no. 81-20,241.