Hard X-ray flux from low-mass stars in the Cygnus OB2 Association (2009)
Caramazza, M., Drake, J. J., Micela, G., Flaccomio, E.
Context. The Cygnus OB2 association, the central engine of the Cygnus X star-forming region, is the subject of an extensive INTEGRAL Key Project that will accumulate 6Ms of observations. Analysis of...
Multi-wavelength observing of a forming solar-like star (2009)
Gregory, S. G., Flaccomio, E., Argiroffi, C., Bouvier, J., Feigelson, E. D., ...
V2129 Oph is a 1.35 solar mass classical T Tauri star, known to possess a strong and complex magnetic field. By extrapolating from an observationally derived magnetic surface map, obtained through...
Results from DROXO. II. - [Ne II] and X-ray emission from Rho Ophiuchi young stellar objects (2009)
Flaccomio, E., Stelzer, B., Sciortino, S., Micela, G., Pillitteri, I., Testi, L.
The infrared [Ne II] and [Ne III] fine structure lines at 12.81um and 15.55um are predicted to trace the circumstellar disk gas subject to X-ray heating and ionization. We investigate the origin of...
Metallicity of low-mass stars in Orion (2009)
D'Orazi, V., Randich, S., Flaccomio, E., Palla, F., Sacco, G. G., Pallavicini, R.
Determining the metal content of low-mass members of young associations provides a tool that addresses different issues, such as triggered star formation or the link between the metal-rich nature of...
On the classification of flaring states of blazar (2009)
Resconi, E., Franco, D., Gross, A., Costamante, L., Flaccomio, E.
The time evolution of the electromagnetic emission from blazars, in particular high frequency peaked sources (HBLs), displays irregular activity not yet understood. In this work we report a...
X-ray observations of IC348 in light of an updated cluster census (2008)
Stelzer, B., Micela, G., Flaccomio, E., Sciortino, S.
IC348 is an excellent laboratory for studies of low-mass star formation being nearby, compact and rich. A Chandra observation was carried out early in the satellite's lifetime. The extensive new data...
X-ray properties of protostars in the Orion Nebula (2008)
Prisinzano, L., Micela, G., Flaccomio, E., Stauffer, J. R., Megeath, T., Rebull, L., ...
The origin and evolution of the X-ray emission in very young stellar objects (YSOs) are not yet well understood because it is very hard to observe YSOs in the protostellar phase. Using COUP data, we...
X-Ray And Optical Observations Of The Star Forming Region Ngc 2264 (2008)
Flaccomio Sciortino, E. Flaccomio, S. Sciortino, G. Micela, F. Damiani, F. Favata, ...
. We present a ROSAT High Resolution Imager (HRI) observation of the star forming region NGC 2264. The analysis has detected more than 40 X-ray sources with Lx in the range 10 30 \Gamma10 31 erg/sec....
E. Flaccomio, F. Damiani, G. Micela, S. Sciortino, F. R. Harnden, S. S. Murray, ...
Using the results of our rst paper on the Chandra HRC observation of the Orion Nebula Cluster (ONC), here we explore the relation between the coronal activity of its 1-Myr-old pre-main sequence...
X-ray properties of protostars in the Orion Nebula (2007)
Prisinzano, L., Micela, G., Flaccomio, E., Stauffer, J. R., Megeath, T., Rebull, L., ...
The origin and evolution of the X-rays in very young stellar objects (YSOs) are not yet well understood since it is very hard to observe YSOs in the protostellar phase. We study the X-ray properties...
Astronomy And Astrophysics (2007)
February Bvri, E. Flaccomio, G. Micela, S. Sciortino, F. Favata, C. Corbally, ...
. The pre-main sequence (PMS) population in the mass range between ß 0:2 and ß 3M fi in southern part of the star-forming region NGC 2264 has been studied, determining both the Initial Mass...
X-Ray Emission, Stellar Populations and Determination of IMF (2007)
Sciortino Micela, S. Sciortino, G. Micela, F. Damiani, E. Flaccomio, Osservatorio Astronomico, ...
X-ray observations allow investigation of the relation among coronal emission level and other stellar parameters, still poorly considered in the standard evolutionary models, such as rotation rate,...
E. Flaccomio, F. Damiani, G. Micela, S. Sciortino, F. R. Harnden, S. S. Murray, ...
In this rst of two companion papers on the Orion Nebula Cluster (ONC), we present our analysis of a 63 Ksec Chandra HRC-I observation that yielded 742 X-ray detections within the 30 eld of view. To...
Young Stars Near Earth: Progress and Prospects (2007)
Asp Conference Series, Ray Jayawardhana, Thomas Greene, S. Sciortino, F. Damiani, F. Favata, ...
We present results of our ongoing study of the low-mass members of Upper Sco-Cen based on deep BVRI photometry and XMMNewton EPIC observations purposely obtained as part of the GTO program. Analyzing...
Astronomy Astrophysics manuscript no. H4001 February 17, 2003 (2007)
Doi Will Be, E. Flaccomio, G. Micela, S. Sciortino
We investigate the evolution of X-ray stellar activity from the age of the youngest known star forming regions (SFR), . 1Myr, to about 100 Myr, i.e. the zero age main sequence (ZAMS) for a 1M star....
Stellar Coronae in the Chandra and XMM-Newton Era (2007)
Asp Conference Series, J. Drake, S. Sciortino, F. Damiani, F. Favata, F. Favata, ...
As part of our long-term eort to characterize the low-mass stellar population of the Upper Sco-Cen association based on deep Xray surveys and follow-up optical observations we present results from a...
Giardino, G., Favata, F., Pillitteri, I., Flaccomio, E., Micela, G., Sciortino, S.
AIMS. We study the variability of the Fe 6.4 KeV emission line from the Class I young stellar object Elias 29 in the Rho-Oph cloud. METHODS. We analysed the data from Elias 29 collected by XMM during...
X-ray flaring from the young stars in CygnusOB2 (2007)
Colombo, J. F. Albacete, Caramazza, M., Flaccomio, E., Micela, G., Sciortino, S.
Aims: We characterize individual and ensemble properties of X-ray flares from stars in the CygOB2 and ONC star-forming regions. Method: We analyzed X-ray lightcurves of 1003 CygOB2 sources observed...
X-ray Flares in Orion Low Mass Stars (2007)
Caramazza, M., Flaccomio, E., Micela, G., Reale, F., Wolk, S. J., Feigelson, E. D.
Context. X-ray flares are common phenomena in pre-main sequence stars. Their analysis gives insights into the physics at work in young stellar coronae. The Orion Nebula Cluster offers a unique...
Coronal Abundances in Orion Nebula Cluster Stars (2007)
Maggio, A., Flaccomio, E., Favata, F., Micela, G., Sciortino, S., Feigelson, E. D., ...
Following the Chandra Orion Ultradeep Project (COUP) observation, we have studied the chemical composition of the hot plasma in a sample of 146 X-ray bright pre-main sequence stars in the Orion...
Spectral and temporal classification of x-ray sources in young stellar clusters (2007)
Hojnacki, Susan, Micela, G., Flaccomio, E., Kastner, Joel
Luminous, highly variable X-ray emission is one of the defining characteristics of low-mass, pre-main sequence (PMS) stars. A very wide range of temporal behavior has been observed in Chandra and...
Unveiling the Cygnus OB2 stellar population with Chandra (2006)
Colombo, J. F. Albacete, Flaccomio, E., Micela, G., Damiani, F., Sciortino, S.
The aim of this work is to identify the so far unknown low mass stellar population of the ~2Myr old Cygnus OB2 region, and to investigate the X-ray and near-IR stellar properties of its members. We...
Stelzer, B., Flaccomio, E., Briggs, K., Micela, G., Scelsi, L., Audard, M., ...
This work is part of a systematic X-ray survey of the Taurus star forming complex with XMM-Newton. We study the time series of all X-ray sources associated with Taurus members, to statistically...
XMM-Newton survey of two Upper Scorpius regions (2006)
Argiroffi, C., Favata, F., Flaccomio, E., Maggio, A., Micela, G., Peres, G., ...
We study X-ray emission from young stars by analyzing deep XMM-Newton observations of two regions of the Upper Scorpius association, having an age of 5 Myr. Based on near infrared and optical...
ACIS-I observations of NGC2264. Membership and X-ray properties of PMS stars (2006)
Flaccomio, E., Micela, G., Sciortino, S.
We analyze a deep, 100 ksec long, Chandra ACIS observation of NGC2264. We detect 420 sources, 85% of which are associated with known optical and NIR counterparts. More than 90% of these counterparts...
Chandra X-Ray Observations of Young Clusters. III. NGC 2264 and the Orion Flanking Fields (2006)
Rebull, L. M., Stauffer, J. R., Ramirez, S. V., Flaccomio, E., Sciortino, S., Micela, G., ...
Chandra observations of solar-like pre-main sequence (PMS) stars in the Orion Flanking Fields (age ~1 Myr) and NGC 2264 (~3 Myr) are compared with the results of the COUP survey of similar objects in...
Astronomy Astrophysics manuscript no. aa6043 c (2006)
Eso August Statistical, B. Stelzer, E. Flaccomio, K. Briggs, G. Micela, L. Scelsi, ...
Context. This work is part of a systematic X-ray survey of the Taurus star forming complex with XMM-Newton.
Astronomy Astrophysics manuscript no. upsco c (2006)
Eso Th July, C. Argiroffi, F. Favata, E. Flaccomio, A. Maggio, G. Micela, ...
Aims. We study X-ray emission from young stars by analyzing deep XMM-Newton observations of two regions of the Upper Scorpius association, having an age of 5 Myr.
Stelzer, B., Micela, G., Flaccomio, E., Neuhaeuser, R., Jayawardhana, R., ...
Three brown dwarfs in different evolutionary stages have been observed with the Chandra X-ray Observatory. Combining the new observations with previous studies presented in the literature yields a...
Wolk, S. J., Flaccomio, E., Micela, G., Favata, F., Glassgold, A. E., Shang, H., ...
In January 2003, the Chandra Orion Ultradeep Project (COUP) detected about 1400 young stars during a 13.2 day observation of the Orion Nebula Cluster (ONC). This paper studies a well-defined sample...
Rotational modulation of X-ray emission in Orion Nebula young stars (2005)
Flaccomio, E., Micela, G., Sciortino, S., Feigelson, E. D., Herbst, W., Favata, F., ...
We investigate the spatial distribution of X-ray emitting plasma in a sample of young Orion Nebula Cluster stars by modulation of their X-ray light-curves due to stellar rotation. The study, part of...
Bright X-ray flares in Orion young stars from COUP: evidence for star-disk magnetic fields? (2005)
Favata, F., Flaccomio, E., Reale, F., Micela, G., Sciortino, S., Shang, H., ...
We have analyzed a number of intense X-ray flares observed in the Chandra Orion Ultradeep Project (COUP), a 13 days observation of the Orion Nebula Cluster (ONC). Analysis of the flare decay allows...
X-ray emission from early-type stars in the Orion Nebula Cluster (2005)
Stelzer, B., Flaccomio, E., Montmerle, T., Micela, G., Sciortino, S., Favata, F., ...
The X-ray properties of twenty ~1 Myr old O, B, and A stars of the Orion Trapezium are examined with data from the Chandra Orion Ultradeep Project (COUP). On the basis of simple theories for X-ray...
Age spreads in star forming regions: The lithium test in the Orion Nebula Cluster (2005)
Palla, F., Randich, S., Flaccomio, E., Pallavicini, R.
We present the initial results of a study of the surface lithium abundance in a sample of low-mass members (M~0.4-1.0 Msun) of the Orion Nebula Cluster (ONC) that provide an independent clock to...
COUP census of X-ray stars in BN-KL and OMC-1S (2005)
Grosso, N., Feigelson, E. D., Getman, K. V., Townsley, L., Broos, P., Flaccomio, E., ...
We present a study of the X-ray sources detected in the vicinity of two density peaks in the Orion Molecular Cloud 1 (OMC-1) behind the Orion Nebula Cluster (ONC), as seen in the exceptionally deep...
Chandra Orion Ultradeep Project : Observations and source lists (2005)
Getman, K. V., Flaccomio, E., Broos, P. S., Grosso, N., Tsujimoto, M., Townsley, L., ...
The origin of T tauri X-ray emission : New insights from the Chandra Orion Ultradeep Project (2005)
Preibisch, T., Kim, Y. C., Favata, F., Feigelson, E. D., Flaccomio, E., Getman, K., ...
X-ray emission from young brown dwarfs in the Orion Nebula Cluster (2005)
Preibisch, T., McCaughrean, M. J., Grosso, N., Feigelson, E. D., Flaccomio, E., Getman, K., ...
X-ray emission from early-type stars in the Orion Nebula Cluster (2005)
Stelzer, B., Flaccomio, E., Montmerle, T., Micela, G., Sciortino, S., Favata, F., ...
Chandra Orion Ultradeep Project: Observations and Source Lists (2004)
Getman, K. V., Flaccomio, E., Broos, P. S., Grosso, N., Tsujimoto, M., Townsley, L., ...
We present a description of the data reduction methods and the derived catalog of more than 1600 X-ray point sources from the exceptionally deep January 2003 Chandra X-ray Observatory observation of...
The weak-line T Tauri star V410Tau I. A multi-wavelength study of variability (2003)
Stelzer, B., Fernandez, M., Costa, V. M., Gameiro, J. F., Grankin, K., Henden, A., ...
We present the results of an intensive coordinated monitoring campaign in the optical and X-ray wavelength ranges of the low-mass, pre-main sequence star V410Tau carried out with the aim to study the...
Flaccomio, E., Micela, G., Sciortino, S.
We investigate the evolution of X-ray stellar activity from the age of the youngest known star forming regions (SFR), < 1Myr, to about 100 Myr, i.e. the zero age main sequence (ZAMS) for a ~ 1M_sun...
The weak-line T Tauri star V419Tau. I. A multli-wavelength study of variability (2003)
Stelzer, B., Fernández, M., Costa, V. M., Gameiro, J. F., Grankin, K., Henden, A., ...
Chandra X-Ray Observations of the Young Open Cluster NGC 2516 (2003)
Damiani Flaccomio Micela, F. Damiani, E. Flaccomio, G. Micela, S. Sciortino, F. R. Harnden, ...
We present a comprehensive study of the Chandra X-ray observations of the young open cluster NGC 2516. We have analyzed 8 individual Chandra observations. We have combined the data to achieve the...
Observational clues for a role of circumstellar accretion in PMS X-ray activity (2002)
Flaccomio, E., Micela, G., Sciortino, S.
We revisit the published analyses of ROSAT X-ray observations of the star forming regions NGC 2264 and Chamaeleon I (~3 and ~5 Myr old respectively) in the light of newly published optical data. At...
Flaccomio, E., Damiani, F., Micela, G., Sciortino, S., Harnden Jr., F. R., Murray, S. S., ...
In this first of two companion papers on the Orion Nebula Cluster (ONC), we present our analysis of a 63 Ksec Chandra HRC-I observation that yielded 742 X-ray detections within the 30'x30' field of...
Flaccomio, E., Damiani, F., Micela, G., Sciortino, S., Harnden Jr., F. R., Murray, S. S., ...
Using the results of our first paper on the Chandra HRC observation of the Orion Nebula Cluster (ONC), here we explore the relation between the coronal activity of its 1-Myr-old pre-main sequence...
XMM-Newton survey of the low-metallicity open cluster NGC 2516 (2000)
Sciortino, S., Micela, G., Damiani, F., Flaccomio, E., Briggs, K., Denby, M., ...
We present the first results of an XMM-Newton EPIC survey of NGC 2516, a southern low-metallicity open cluster with an age close to the Pleiades. The attained limiting sensitivity is of ~ 2.4 10^-15...
X-ray properties of protostars in the Orion Nebula
L. Prisinzano, G. Micela, E. Flaccomio, J. R. Stauffer, T. Megeath, L. Rebull, ...
The origin and evolution of the X-ray emission in very young stellar objects (YSOs) are not yet well understood because it is very hard to observe YSOs in the protostellar phase. We study the X-ray...