4,472 research outputs found
Die Familie Wolf : [Verzeichnis der Nachkommen des Leopold und der Rosa Wolf, geb. Spitzer]
No full text[Ernst Wolf]Aus der Sammlung des Leo Baeck Institute, digitalisiert in Kooperation mit dem Center for Jewish History, N
A Spitzer IRS survey of Wolf-Rayet stars at 10–20 microns
No full textWe report on a mid-infrared survey of Wolf-Rayet stars using the Spitzer IRS/SH instrument for types WN4-WN7 and WC4-WC7. Strong emission line spectra are seen, including forbidden emission lines. Surprisingly, the WN stars appear to show broad emission “bumps” that may be consistent with silicate dust grains
12 New Galactic Wolf-Rayet Stars Identified via 2MASS + Spitzer/GLIMPSE
No full textWe report new results from our effort to identify obscured Wolf-Rayet stars in the Galaxy. Candidates were selected by their near-infrared (Two Micron All Sky Survey; 2MASS) and mid-infrared (Spitzer/GLIMPSE) color excesses, which are consistent with free-free emission from ionized stellar winds and thermal excess from hot dust. We have confirmed 12 new Wolf-Rayet stars in the Galactic disk, including nine of the nitrogen subtype (WN), and three of the carbon subtype (WC); this raises the total number of Wolf-Rayet stars discovered with our approach to 27. We classify one of the new stars as a possible dust-producing WC9d + OBI colliding-wind binary, as evidenced by an infrared excess resembling that of known WC9d stars, the detection of OBI features superimposed on the WC9 spectrum, and hard X-ray emission detected by XMM-Newton. A WC8 star in our sample appears to be a member of the stellar cluster Danks 1, in contrast to the rest of the confirmed Wolf-Rayet stars that generally do not appear to reside within dense stellar clusters. Either the majority of the stars are runaways from clusters, or they formed in relative isolation. We briefly discuss prospects for the expansion and improvement of the search for Wolf-Rayet stars throughout the Milky Way Galaxy
Neon Abundances from a Spitzer/IRS Survey of Wolf-Rayet Stars
No full textWe report on neon abundances derived from Spitzer high resolution spectral data of eight Wolf-Rayet (WR) stars using the forbidden line of [Ne III] 15.56 μm. Our targets include four WN stars of subtypes 4-7, and four WC stars of subtypes 4-7. We derive ion fraction abundances γ of Ne2+ for the winds of each star. The ion fraction abundance is a product of the ionization fraction Qi in stage i and the abundance by number E of element E relative to all nuclei. Values generally consistent with solar are obtained for the WN stars, and values in excess of solar are obtained for the WC stars
Writers Talk featuring authors Troy Hicks and Elaine Wolf
No full textElaine Wolf, author of Camp, talks to OSU students Erin Reilly-Sanders and Allison Fetzer. Author and teacher Troy Hicks talks to OSU employee Kevin Cordi about the impact of technology on the teaching of writing.The media can be accessed here: http://streaming.osu.edu/knowledgebank/WritersTalk-Audio/WT_2013-3-18-Hicks_Wolf.mp3Ohio State University. Center for the Study and Teaching of Writin
Circumstellar Structure Around Evolved Stars in the Cygnus-X Spitzer Legacy Survey Region
No full textInternational audienceAlthough the Cygnus-X region is primarily known as one of the richest massive star forming regions within 2 kpc, a large number of evolved objects also lie in, or at least along the line-of-sight to, the area observed by the Cygnus-X Spitzer Legacy Survey, including over 100 sources listed by Simbad as carbon stars, Wolf-Rayet stars, planetary nebulae, etc. Our Spitzer 24 micron images, made with the Multi-Band Imaging Photometer for Spitzer (MIPS), reveal previously undetected circumstellar emission from some of these objects. Emission at shorter wavelengths, observed using the Infrared Array Camera (IRAC), was also detected from some of the circumstellar structures, and a few were detected at longer wavelengths (MIPS 70 micron). Here, we present multi-wavelength Spizer images of the objects, including a bipolar nebula around a candidate carbon star BD +43 3710, a shell around the Wolf-Rayet candidate HBHA 4202-22, and a secondary shell around the luminous blue variable G79.29+0.46. In addition to the images, we combine near-infrared data from the 2 Micron All-Sky Survey (2MASS) with our Spitzer data to create spectral energy distributions for both the central objects and surrounding emission. Data from the Infrared Spectrograph (IRS) on Spitzer may also be discussed. We note that spiral structure has also been detected from a radio galaxy in our MIPS 24 micron data
Circumstellar Structure Around Evolved Stars in the Cygnus-X Spitzer Legacy Survey Region
No full textInternational audienceAlthough the Cygnus-X region is primarily known as one of the richest massive star forming regions within 2 kpc, a large number of evolved objects also lie in, or at least along the line-of-sight to, the area observed by the Cygnus-X Spitzer Legacy Survey, including over 100 sources listed by Simbad as carbon stars, Wolf-Rayet stars, planetary nebulae, etc. Our Spitzer 24 micron images, made with the Multi-Band Imaging Photometer for Spitzer (MIPS), reveal previously undetected circumstellar emission from some of these objects. Emission at shorter wavelengths, observed using the Infrared Array Camera (IRAC), was also detected from some of the circumstellar structures, and a few were detected at longer wavelengths (MIPS 70 micron). Here, we present multi-wavelength Spizer images of the objects, including a bipolar nebula around a candidate carbon star BD +43 3710, a shell around the Wolf-Rayet candidate HBHA 4202-22, and a secondary shell around the luminous blue variable G79.29+0.46. In addition to the images, we combine near-infrared data from the 2 Micron All-Sky Survey (2MASS) with our Spitzer data to create spectral energy distributions for both the central objects and surrounding emission. Data from the Infrared Spectrograph (IRS) on Spitzer may also be discussed. We note that spiral structure has also been detected from a radio galaxy in our MIPS 24 micron data
Translating the Author-Function: The (Re)Narration of Christa Wolf
No full textNarrative theory continues to offer new perspectives on the intercultural transfer of texts. Embedded in new narratives, the text opens up to new interpretations, resulting in the loss and acquisition of meaning. The writer’s persona or author-function (Foucault 1977) is also renegotiated by cultural transfer, as it is cumulatively and dynamically constructed through readings of an author’s texts and literary or biographical contexts. The translated author-function may differ considerably from the domestic, and may also interact with it as in the case of the East German writer Christa Wolf, whose international author-function has served for contrast (if not conflict) with her reception in the German Democratic Republic and united Germany. This was particularly marked during the 1990s, when revelations about Wolf’s political activity led to censure by the German media and literati. This paper demonstrates how the translation of Wolf’s texts and the construction of her international author-function have renegotiated her position within her domestic literary field
Identifying primordial substructure in NGC 2264 with Spitzer
No full textWe present new results on the massive young cluster NGC 2264 based on the analysis of data acquired from the Spitzer Space Telescope. The MIPS (Multiband Imaging Photometer for Spitzer) has enabled us to identify the most recent episodes of star formation in NGC 2264. In particular, the 24 micron data combined with submillimeter observations from Wolf-Chase (2003) indicate that the most recent star formation events have occurred primarily within dusty filaments of dense gas in the central regions of the complex. These observations provide interesting constrains for theoretical models of collapsing molecular clouds. Additional IRAC (Infrared Array Camera) and near-infrared JHK 2MASS data has enabled us to assemble spectral energy distributions which help elucidate the natures of the deeply embedded sources and confirm their extreme youth and status as protostellar objects
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