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  • 1
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    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.40 (2013) p.9
    Publication Date: 2015-12-09
    Description: Cucujus cinnaberinus is een recent voor Nederland ontdekte soort. De kever staat op de Habitatrichtlijn, wat onder meer betekent dat hij beschermd is en dat de populatie gemonitord dient te worden. Inventarisatie en monitoring gebeurt in het algemeen door het weghalen van schors van recent gestorven bomen. Hierdoor wordt het leefgebied van de kever echter flink aangetast. Wij voerden een klein onderzoek uit naar de mogelijkheden om C. cinnaberinus te vangen in azijnzuurvallen, zodat de habitat intact gelaten kan worden en de soort toch geïnventariseerd kan worden. Tijdens het voorjaar van 2013 werden vier vallen opgehangen op een locatie waar zich een populatie van deze soort bevindt. Er werden slechts twee individuen verzameld; de vangmethode lijkt dus niet bijzonder geschikt.
    Keywords: Coleoptera ; Cucujidae ; Cucujus cinnaberinus ; methode ; inventarisatie ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 2
    Publication Date: 2019-07-13
    Description: The 30 Myr old A3-type star HD 21997 is one of the two known debris dust disks having a measurable amount of cold molecular gas. With the goal of understanding the physical state, origin, and evolution of the gas in young debris disks, we obtained CO line observations with the Atacama Large Millimeter/submillimeter Array (ALMA). Here, we report on the detection of (12)CO and (13)CO in the J = 2-1 and J = 3-2 transitions and C(18)O in the J = 2-1 line. The gas exhibits a Keplerian velocity curve, one of the few direct measurements of Keplerian rotation in young debris disks. The measured CO brightness distribution could be reproduced by a simple star+disk system, whose parameters are r(sub in) 〈 26 AU, r(sub out) = 138 +/- 20 AU, Stellar M = 1.8 +0.5/0.2 Solar M, and i = 32. Deg. 6 +/- 3 deg..1. The total CO mass, as calculated from the optically thin C(18)O line, is about (4-8) 10(exp 2 ) Solar M, while the CO line ratios suggest a radiation temperature on the order of 6-9 K. Comparing our results with those obtained for the dust component of the HD 21997 disk from ALMA continuum observations by Moor et al., we conclude that comparable amounts of CO gas and dust are present in the disk. Interestingly, the gas and dust in the HD 21997 system are not colocated, indicating a dust-free inner gas disk within 55 AU of the star. We explore two possible scenarios for the origin of the gas. A secondary origin, which involves gas production from colliding or active planetesimals, would require unreasonably high gas production rates and would not explain why the gas and dust are not colocated. We propose that HD 21997 is a hybrid system where secondary debris dust and primordial gas coexist. HD 21997, whose age exceeds both the model predictions for disk clearing and the ages of the oldest T Tauri-like or transitional gas disks in the literature, may be a key object linking the primordial and the debris phases of disk evolution.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN12445 , The Astrophysical Journal (ISSN 0004-637X); 776; 2; 77
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  • 3
    Publication Date: 2019-07-13
    Description: We report spectroscopic and imaging observations of rotational transitions of cold CO and SiO in the ejecta of SN1987A, the first such emission detected in a supernova remnant. In addition to line luminosities for the CO J = 1-0, 2-1, 6-5, and 7-6 transitions, we present upper limits for all other transitions up to J = 13-12, collectively measured from the Atacama Large Millimeter Array, the Atacama Pathfinder EXperiment, and the Herschel Spectral and Photometric Imaging REceiver. Simple models show the lines are emitted from at least 0.01 M of CO at a temperature 〉14 K, confined within at most 35% of a spherical volume expanding at ~2000 km s-1. Moreover, we locate the emission within 1'' of the central debris. These observations, along with a partial observation of SiO, confirm the presence of cold molecular gas within supernova remnants and provide insight into the physical conditions and chemical processes in the ejecta. Furthermore, we demonstrate the powerful new window into supernova ejecta offered by submillimeter observations.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN11828 , The Astrophysical Journal Letters (ISSN 2041-8205) (e-ISSN 2041-8213); 773; 2; L34
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