The X-ray luminosity of solar-mass stars in the intermediate age open cluster NGC 752 (2008)
Giardino, G., Pillitteri, I., Favata, F., Micela, G.
AIMS. While observational evidence shows that most of the decline in a star's X-ray activity occurs between the age of the Hyades (~8 x 10^8 yrs) and that of the Sun, very little is known about the...
Favata, F., Neiner, C., Testa, P., Hussain, G., Sanz-Forcada, J.
(abridged) We have performed a set of phase-resolved X-ray observations of the magnetic B star Beta Cep, for which theoretical models predict the presence of a confined wind emitting X-rays from...
The X-ray cycle in the solar-type star HD 81809 (2008)
Favata, F., Micela, G., Orlando, S., Sciortino, S., Hall, J.
(abridged) Our long-term XMM-Newton program of long-term monitoring of a solar-like star with a well-studied chromospheric cycle, HD 81809 aims to study whether an X-ray cycle is present, along with...
Neon and oxygen in low activity stars: towards a coronal unification with the Sun (2008)
The disagreement between helioseismology and a recent downward revision of solar abundances has resulted in a controversy about the true neon abundance of the Sun and other stars. We investigated...
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...
The correlation between soft and hard X-rays component in flares: from the Sun to the stars (2007)
Isola, C., Favata, F., Micela, G., Hudson, H. S.
In this work we study the correlation between the soft (1.6--12.4 keV, mostly thermal) and the hard (20--40 and 60--80 keV, mostly non-thermal) X-ray emission in solar flares up to the most energetic...
Hussain, G. A. J., Jardine, M., Brickhouse, N. S., Dunstone, N. J., Wood, K., ...
We obtain contemporaneous observations of the surface and corona of AB Dor using ground-based circularly polarised spectra from the Anglo-Australian Telescope and X-ray data from the Chandra...
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...
Cnossen, I., Sanz-Forcada, J., Favata, F., Witasse, O., Zegers, T., Arnold, N. F.
Solar X-ray and UV radiation (0.1-320 nm) received at Earth's surface is an important aspect of the circumstances under which life formed on Earth. The quantity that is received depends on two main...
Sanz-Forcada, J., Favata, F., Micela, G.
The observation of eclipses during X-rays flares taking place in active cool stars binaries allows us to calculate the position and size of the flares. This information cannot be derived by analyzing...
Giardino, G., Favata, F., Micela, G., Sciortino, S., Winston, E.
AIMS: To study the properties of X-ray emissions from young stellar objects (YSOs), through their evolution from Class I to Class III and determine whether Class 0 protostars emit in X-rays. METHODS:...
X-rays from protostellar jets: emission from continuous flows (2006)
Bonito, R., Orlando, S., Peres, G., Favata, F., Rosner, R.
Recently X-ray emission from protostellar jets has been detected with both XMM-Newton and Chandra satellites, but the physical mechanism which can give rise to this emission is still unclear. We...
The stellar content of the XMM-Newton Bright Serendipitous Survey (2006)
Lopez-Santiago, J., Micela, G., Sciortino, S., Favata, F., Caccianiga, A., Della Ceca, R., ...
Context: The comparison of observed counts in a given sky direction with predictions by Galactic models yields constraints to the spatial distribution and the stellar birthrate of young stellar...
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...
Unveiling the nature of the highly absorbed X-ray source SAXJ1748.2-2808 with XMM-Newton (2006)
Sidoli, L., Mereghetti, S., Favata, F., Oosterbroek, T., Parmar, A. N.
We report on the results of an EPIC XMM-Newton observation of the faint source SAXJ1748.2-2808 and the surrounding field. This source was discovered during the BeppoSAX Galactic center survey...
Giardino, G., Favata, F., Silva, B., Micela, G., Reale, F., Sciortino, S.
We present the results of a five-day monitoring campaign with XMM-Newton of six X-ray bright young stellar objects (YSOs) in the star-forming complex L1551 in Taurus. All stars present significant...
The discovery of an expanding X-ray source in the HH 154 protostellar jet (2006)
Favata, F., Bonito, R., Micela, G., Fridlund, M., Orlando, S., Sciortino, S., ...
We have performed, in October 2005, a deep Chandra X-ray observation of HH 154. Comparison with the previous (2001) Chandra observation allows to detect proper motion down to the level predicted by...
A compact flare eclipsed in the corona of SV Cam (2005)
Sanz-Forcada, J., Favata, F., Micela, G.
The eclipsing active binary SV Cam (G0V/K6V, P_0.593071 d) was observed with XMM-Newton during two campaigns in 2001 and 2003. No eclipses in the quiescent emission are clearly identified, but a...
X-rays from Alpha Centauri - The darkening of the solar twin (2005)
We present first results from five XMM-Newton observations of the binary system Alpha Centauri, which has been observed in snapshot like exposures of roughly two hours each during the last two years....
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...
Report by the ESA-ESO Working Group on Extra-Solar Planets (2005)
Perryman, M., Hainaut, O., Dravins, D., Leger, A., Quirrenbach, A., Rauer, H., ...
Various techniques are being used to search for extra-solar planetary signatures, including accurate measurement of radial velocity and positional (astrometric) displacements, gravitational...
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...
HST and spectroscopic observations of the L1551 IRS5 jets (HH154) (2005)
Fridlund, C. V. M., Liseau, R., Djupvik, A. A., Huldtgren, M., White, Glenn. J., Favata, F., ...
We have carried out a thorough optical study of the closest star formation jet. The inner arcminute surrounding the class 0/I binary protostar L1551 IRS5 and its associated jet (HH154) have been...
X-rays from accretion shocks in T Tauri stars: The case of BP Tau (2005)
Robrade, J., Favata, F., Stelzer, B.
We present an XMM-Newton observation of the classical T Tauri star BP Tau. In the XMM-Newton RGS spectrum the O {\sc vii} triplet is clearly detected with a very weak forbidden line indicating high...
Report by the ESA-ESO Working Group on Extra-Solar Planets (2005)
Perryman, M., Hainhaut, O., Dravins, D., Léger, A., Quirrenbach, A., Rauer, H., ...
Various techniques are being used to search for extra-solar planetary signatures, including accurate measurement of radial velocity and positional (astrometric) displacements, gravitational...
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 early-type stars in the Orion Nebula Cluster (2005)
Stelzer, B., Flaccomio, E., Montmerle, T., Micela, G., Sciortino, S., Favata, F., ...
The Life of Stars and their Planets (2005)
Catala, C., Aerts, C., Aigrain, S., Antonello, E., Appourchaux, T., Auvergne, M., ...
We lack a reliable scenario for the formation and evollution of stars and their planetary systems, involving key factors such as magnetic fields and turbulence. We present the case for a mission...
Iron Fluorescent Line Emission from Young Stellar Objects in the Orion Nebula (2004)
Tsujimoto, M., Feigelson, E. D., Grosso, N., Micela, G., Tsuboi, Y., Favata, F., ...
We present the result of a systematic search for the iron Kalpha fluorescent line at 6.4 keV among 1616 X-ray sources detected by ultra-deep Chandra observations of the Orion Nebula Cluster and the...
Favata, F., Micela, G., Silva, B., Sciortino, S., Tsujimoto, M.
We report the results of a search for 6.4 keV Fe fluorescent emission in Young Stellar Objects (YSOs) with measured accretion luminosities in the rho Oph cloud, using all existing chandra and...
Accretion, fluorescent X-ray emission and flaring magnetic structures in YSOs (2004)
I present some recent developments on high-energy phenomena in YSOs, concentrating on the new evidence for accretion-induced X-ray emission in YSOs, for Fe 6.4 keV fluorescent emission from the disks...
Hussain, G. A. J., Brickhouse, N. S., Dupree, A. K., Jardine, M. M., Van Ballegooijen, A. A., Hoogerwerf, R., ...
The Chandra X-ray observatory monitored the single cool star, AB Doradus, continuously for a period lasting 88 ksec (1.98 Prot) in 2002 December with the LETG/HRC-S. The X-ray lightcurve shows...
Inferring coronal structure using X-ray spectra: A Chandra study of AB Dor (2004)
Hussain, G. A. J., Brickhouse, N. S., Dupree, A. K., Jardine, M., Van Ballegooijen, A., Cameron, A. Collier, ...
The Chandra X-ray observatory monitored the single cool star, AB Doradus, continuously for a period lasting 88ksec (1.98 Prot) in 2002 December with the LETG/HRC-S. The X-ray lightcurve shows...
Giardino, G., Favata, F., Micela, G.
We present Chandra observations of the massive star-forming region S106, a prominent HII region in Cygnus, associated with an extended molecular cloud and a young cluster. The nebula is excited by a...
Morel, T., Micela, G., Favata, F., Katz, D.
We report the determination from high-resolution spectra of the atmospheric parameters and abundances of 13 chemical species (among which lithium) in 8 single-lined active binaries. These data are...
Feigelson, E. D., Hornschemeier, A. E., Micela, G., Bauer, F. E., Alexander, D. M., Brandt, W. N., ...
The extremely sensitive Chandra Deep Field-North (CDF-N) pencil-beam X-ray survey is used to identify and characterize the X-ray emission from old high-latitude main sequence Galactic stars. Our...
Favata, F., Micela, G., Baliunas, S. L.
We present the initial results from our XMM program aimed at searching for X-ray activity cycles in solar-type stars. HD 81809 is a G2-type star (somewhat more evolved than the Sun, and with a less...
Parameter properties and stellar population of the old open cluster NGC 3960 (2004)
Prisinzano, L., Micela, G., Sciortino, S., Favata, F.
We present a $BVI$ photometric and astrometric catalogue of the open cluster NGC 3960, down to limiting magnitude $V\sim22$, obtained from observations taken with the Wide Field Imager camera at the...
Coronal versus photospheric abundances of stars with different activity levels (2003)
Sanz-Forcada, J., Favata, F., Micela, G.
We report a detailed analysis of the coronal abundance of 4 stars with varying levels of activity and with accurately known photospheric abundances. The coronal abundance is determined here using a...
A large X-ray flare from the Herbig Ae star V892 Tau (2003)
Giardino, G., Favata, F., Micela, G., Reale, F.
We report the XMM-Newton observation of a large X-ray flare from the Herbig Ae star V892 Tau. The apparent low mass companion of V892 Tau, V892 Tau NE, is unresolved by XMM-Newton. Nevertheless there...
Characterising stellar micro-variability for planetary transit searches (2003)
Aigrain, S., Favata, F., Gilmore, G.
(abridged) A method for simulating light curves containing stellar micro-variability for a range of spectral types and ages, based on parameter-by-parameter scaling of a multi-component fit to the...
Morel, T., Micela, G., Favata, F., Katz, D., Pillitteri, I.
Photospheric parameters and abundances are presented for a sample of single-lined chromospherically active binaries from a differential LTE analysis of high-resolution spectra. Abundances have been...
Astronomy Astrophysics manuscript no. (2003)
L. Prisinzano, G. Micela, S. Sciortino, F. Favata
We present UBVRI photometry of the open cluster NGC 2422 (age 10 yr) down to a limiting magnitude V ' 19. These data are used to derive the Luminosity and Mass Functions and to study the cluster...
Luminosity and Mass Function of the Galactic open cluster NGC 2422 (2003)
Prisinzano, L., Micela, G., Sciortino, S., Favata, F.
We present UBVRI photometry of the open cluster NGC 2422 (age $\sim 10^8$ yr) down to a limiting magnitude $V\simeq19$. These data are used to derive the Luminosity and Mass Functions and to study...
Favata, F., Giardino, G., Micela, G., Sciortino, S., Damiani, F.
We present a study of the X-ray sources present in the nearby L1551 star forming region, based on a deep XMM observation complemented with Chandra data for the brightest sources. All the known...
Aa 397, 747--756 (2003) (2003)
The high-resolution optical spectra of the two X-ray active binaries RS CVn stars HD 113816 (IS Vir) and HD 119285 (V851 Cen) are analysed and their Na, Mg, Al, Si, Ca, Sc, Ti, Co and Ni contents...
Astron. Nachr./AN 32X (200X) X, XXX--XXX (2003)
G. Micela, A. Baldi, F. Cocchia, F. Favata, F. Fiore, S. Molendi
d to consider separately stars of different age. We consider three age ranges, each characterized by different X-ray luminosity functions and coronal temperature. At our typical sensitivities, for a...
Astron. Nachr./AN 32X (200X) X, XXX--XXX (2003)
G. Micela, F. Favata, E. Feigelson
Introduction We present our ongoing work on the stellar content of Chandra Deep Field North survey based on the analysis of the 1 Msec data (Brandt et al. 2001) in the 0.5-2.0 keV band. The optical...
I. Pillitteri, G. Micela, S. Sciortino, F. Favata
We present X-ray Luminosity Distributions (XLDs) of late-type members (dF, dG, dK, dM) of the Blanco 1 cluster, based on ROSAT-HRI data and new astrometric-photometric membership obtained from the...
Katz, D., Favata, F., Aigrain, S., Micela, G.
The high-resolution optical spectra of the two X-ray active binaries RS CVn stars HD 113816 (IS Vir) and HD 119285 (V851 Cen) are analysed and their Na, Mg, Al, Si, Ca, Sc, Ti, Co and Ni contents...
A modified version of the Gregory-Loredo method for Bayesian periodic signal detection (2002)
The detection of planetary transits in stellar photometric light-curves is poised to become the main method for finding substantial numbers of terrestrial planets. The French-European mission COROT...
Aigrain, S., Gilmore, G., Favata, F., Carpano, S.
Stellar micro-variability poses a serious threat to the capacities of space-based planet-finding missions such as Kepler or Eddington. The solar lightcurves obtained by the VIRGO PMO6 and SPM...
STJ Observations of the Eclipsing Polar HU Aqr (2002)
Bridge, C. M., Cropper, Mark, Ramsay, Gavin, Perryman, M. A. C., Favata, F., ...
We apply an eclipse mapping technique to observations of the eclipsing magnetic cataclysmic variable HU Aqr. The observations were made with the S-Cam2 Superconducting Tunnel Junction detector at the...
Stellar Coronae in the Chandra and XMM-Newton Era (2002)
J. Drake, S. Sciortino, F. Damiani, F. Favata, E. Flaccomio, G. Micela, ...
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...
M. Barbera, F. Bocchino, F. Damiani, G. Micela, S. Sciortino, F. Favata
We present the results of a ROSAT study of NGC 2422, a southern open cluster at a distance of about 470 pc, with an age close to the Pleiades. Source detection was performed on two observations, a...
Direct determination of quasar redshifts (2002)
Reynolds, A.P., Perryman, M.A.C., Peacock, A., Favata, F., Rando, N., ...
Direct determination of quasar redshifts (2002)
Reynolds, A.P., Perryman, M.A.C., Peacock, A., Favata, F., Rando, N., ...
Astronomy Astrophysics manuscript no. (2001)
F. Favata, G. Micela, S. Sciortino, A. Kaas
We have for the rst time detected X-ray emission associated with a protostellar jet, on the jet emanating from the L1551 IRS5 protostar. The IRS5 protostar is hidden behind a very large absorbing...
The discovery of X-ray emission from the protostellar jet L1551 IRS5 (HH 154) (2001)
Favata, F., Fridlund, C. V. M., Micela, G., Sciortino, S., Kaas, A. A.
We have for the first time detected X-ray emission associated with a protostellar jet, on the jet emanating from the L1551 IRS5 protostar. The IRS5 protostar is hidden behind a very large absorbing...
Stellar Coronae in the Chandra and XMM-Newton Era (2001)
F. Favata, J. Drake, Stephen M. White
We briefly review the status of radio observations of the solar atmosphere with an emphasis on relevance to stellar observations.
Discovery of X-ray emission from the proto-stellar jet L1551 IRS5 (HH 154) (2001)
F. Favata, J. Drake, L Irs (hh, Fabio Favata, G. Micela, ...
We have for the rst time detected X-ray emission associated with a proto-stellar jet, on the jet emanating from L1551 IRS5. The IRS5 proto-star is hidden beyond a very large absorbing column density,...
Mon. Not. R. Astron. Soc. 000, 000-000 (0000) Printed 25 April 2001 (MN L A T E X style (2001)
J. E. Morley, K. R. Briggs, J. P. Pye, F. Favata, G. Micela, S. Sciortino
We have performed a moderately deep soft X-ray (0.1-2 keV) survey of the Galactic Plane using pointed observations with the ROSAT Position Sensitive Proportional Counter (PSPC). The survey is more...
Young Stars Near Earth: Progress and Prospects (2001)
Ray Jayawardhana, Thomas Greene, S. Sciortino, F. Damiani, F. Favata, E. Flaccomio, ...
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...
Coronal structure geometries on pre-main sequence stars (2001)
Favata, F., Micela, G., Reale, F.
We have re-analyzed using a hydrodynamic model large flaring events on three different categories of pre-main sequence (PMS) stars: the young stellar object (YSO) YLW 15, the classical T Tauri star...