Search results for " Planet"
showing 10 items of 5473 documents
YSOs in DROXO (Deep rho Oph XMM obs.)
2011
X-rays from very young stars are powerful probes to investigate the mechanisms at work in the very first stages of the star formation and the origin of X-ray emission in very young stars. We present results from a 500ks long observation of the rho Ophiuchi cloud with a XMM-Newton large program named DROXO, aiming at studying the X-ray emission of deeply embedded young stellar objects (YSOs). Cone search capability for table J/A+A/519/A34/tablea1 (List of sources detected in the DROXO EPIC images) Cone search capability for table J/A+A/519/A34/tablea3 (ISOCAM YSOs (Bontemps et al. 2001, J/A+A/372/173) undetected in the DROXO field of view)
Brown Dwarfs in ChaI Dark Cloud
2004
We present the results of a multiband survey for brown dwarfs in the Chamaeleon I dark cloud with the Wide Field Imager (WFI) camera at the ESO/MPG 2.2-m telescope on La Silla (Chile) on 28-May to 03-Jun 1999. The survey has revealed a substantial population of brown dwarfs in this southern star-forming region. Candidates were selected from R, I and H{alpha} imaging observations. We also observed in two medium-band filters, M855 and M915, for spectral type determination. The former filter covers a wavelength range containing spectral features characteristic of M-dwarfs, while the latter lies in a relatively featureless wavelength region for these late-type objects. A correlation was found b…
VCNS II. The IR-excess-selected population
2015
We performed a deep wide-field (6.76 square-degrees) near-infrared survey with the VISTA telescope that covers the entire extent of the Carina nebula complex. Complementing the VISTA near-infrared catalog with Spitzer IRAC mid-infrared photometry improves the situation of the background contamination considerably. We find that a (J-H) versus (Ks-[4.5]) color-color diagram is well suited to tracing the population of YSO-candidates (cYSOs) by their infrared excess. We identify 8781 sources with strong infrared excess, which we consider as cYSOs. This sample is used to investigate the spatial distribution of the cYSOs with a nearest-neighbor analysis. The surface density distribution of cYSOs …
Variability in proto-PNe. II.
2014
We have carried out a detailed observational study of the light, color, and velocity variations of two bright, carbon-rich proto-planetary nebulae, IRAS 22223+4327 and 22272+5435. The light curves are based upon our observations from 1994 to 2011, together with published data by Arkhipova and collaborators. They each display four significant periods, with primary periods for IRAS 22223+4327 and 22272+5435 being 90 and 132 days, respectively. For each of them, the ratio of secondary to primary period is 0.95, a value much different from that found in Cepheids, but which may be characteristic of post-asymptotic giant branch (AGB) stars. Fewer significant periods are found in the smaller radia…
Chandra X-ray observation of Gum 31
2014
Gum 31 is a prominent, but still rather poorly studied HII region around the stellar cluster NGC 3324 at the northwestern periphery of the Carina nebula complex. Our aim was to reveal and characterize the young stellar population in Gum 31. An X-ray survey is the only efficient way to identify young stars in this region with extremely high galactic field-star contamination that can avoid the strong biases of infrared excess selected samples of disk-bearing young stars. We used the Chandra observatory to perform a deep (70ks) X-ray observation of the Gum 31 region and detected 679 X-ray point sources. This extends and complements the X-ray survey of the central Carina nebula regions performe…
The WEBT BL Lacertae Campaign 2001 and its extension : Optical light curves and colour analysis 1994–2002
2004
BL Lacertae has been the target of four observing campaigns by the Whole Earth Blazar Telescope (WEBT) collaboration. In this paper we present UBVRI light curves obtained by theWEBT from 1994 to 2002, including the last, extended BL Lac 2001 campaign. A total of about 7500 optical observations performed by 31 telescopes from Japan to Mexico have been collected, to be added to the ∼15 600 observations of the BL Lac Campaign 2000. All these data allow one to follow the source optical emission behaviour with unprecedented detail. The analysis of the colour indices reveals that the flux variability can be interpreted in terms of two components: longer-term variations occurring on a fewday time …
Homot ja heterot Suomi24:ssä: analyysi digitaalisista diskursseista
2018
Artikkelissani tarkastelen Suomi24-keskustelupalstan homouteen ja heterouteen liittyviä toistuvia diskursseja. Analyysi on toteutettu korpusavusteisena diskurssintutkimuksena (CADS), jossa suureen dataan perustuva tilastollinen avainsana-analyysi nostaa esiin suomalaisen yhteiskunnan sosiaalisesti jaetut diskurssit. Tulokset yhtäältä tukevat aiempia media-analyyseissä tehtyjä havaintoja voimakkaista affekteista ja vihapuheesta sekä homoseksuaalisuuden politisoitumisesta ja uskonnollistumisesta. Toisaalta se myös paljastaa homodiskurssien henkilöitymisen tai liittymisen tiettyihin henkilöryhmiin ja paikkoihin. Heterodiskurssit puolestaan eroavat selvästi homodiskursseista: niille on tyypilli…
Viittomakielet hybridisysteemeinä - hämärärajaisuus ja epäkonventionaalisuus osana viittomakielten rakennetta
2018
Tässä artikkelissa tarkastellaan hämärärajaisuutta ja epäkonventionaalisuutta osana joitakin kaikista viittomakielistä löydettyjä yksiköitä ja rakenteita ja niiden käyttöä. Täsmällisemmin artikkelin fokuksessa ovat tietyt muodoltaan ja merkitykseltään tilanteisesti muuntuvat viittomat (erityisesti niin kutsutut osittain leksikaaliset viittomat) sekä eräänlainen vaihteleva-asteinen näytteleminen (niin kutsuttu konstruoitu toiminta), jota viittojat käyttävät tuottamiensa syntaktisten rakenteiden osana ja niiden sijaan. Käytännössä artikkeli esittelee näkemyksen, jonka mukaan molemmissa tarkastelun kohteena olevissa ilmiöissä on kyse samasta asiasta eli kielen diskreettien ja konventionaaliste…
Implementing Intranet 2.0: A Study of Knowledge Requirements for External Consultants in Enterprise Systems
2014
Published article from the series: Procedia Technology. Also available on Science Direct: http://dx.doi.org/10.1016/j.protcy.2014.10.018 Open Access This paper reports on a case study focusing on intranet implementation projects seen from a consultancy lens. SharePoint is an Intranet 2.0 platform which is a user-centric system based on functionalities adapted from Web 2.0 technologies. Intranet implementation projects are accompanied by a complex socio-technical organizational environment, and require changes in organizational structure and culture. While former studies mainly have focused on challenges seen from the implementing organization's perspective, this study focuses on the experie…
Regional Development: The Importance of the Involvement of Inhabitants and Innovative Approaches in Management
2021
Innovation and an innovative approach in management, education and leadership have been changing over decades, according to the dynamic world we are living in. Changes start at an individual level, with the personality, and only those who have changed themselves can start to lead others towards global change. The Latvian National Development Plan defined aspects of polycentric development for all the regions of Latvia. Each region has resources, strengths, weaknesses, opportunities and threats, but human resources are the most important resource for change, creative ideas and sustainable development. The education system changes very slowly, from lecture learning to a more inclusive ‘learni…