61 research outputs found
A high-precision near-infrared survey for radial velocity variable low-mass stars using CSHELL and a methane gas cell
Get PDFWe present the results of a precise near-infrared (NIR) radial velocity (RV) survey of 32 low-mass stars with spectral types K2-M4 using CSHELL at the NASA InfraRed Telescope Facility in the K band with an isotopologue methane gas cell to achieve wavelength calibration and a novel, iterative RV extraction method. We surveyed 14 members of young (≈25-150 Myr) moving groups, the young field star ϵ Eridani, and 18 nearby (<25 pc) low-mass stars and achieved typical single-measurement precisions of 8-15 m s-1with a long-term stability of 15-50 m s-1 over longer baselines. We obtain the best NIR RV constraints to date on 27 targets in our sample, 19 of which were never followed by high-precision RV surveys. Our results indicate that very active stars can display long-term RV variations as low as ∼25-50 m s-1 at ≈2.3125 μm, thus constraining the effect of jitter at these wavelengths. We provide the first multiwavelength confirmation of GJ 876 bc and independently retrieve orbital parameters consistent with previous studies. We recovered RV variabilities for HD 160934 AB and GJ 725 AB that are consistent with their known binary orbits, and nine other targets are candidate RV variables with a statistical significance of 3σ-5σ. Our method, combined with the new iSHELL spectrograph, will yield long-term RV precisions of ≲5 m s-1 in the NIR, which will allow the detection of super-Earths near the habitable zone of mid-M dwarfs
F. Djindjian , J. Kozlowski et M. Otte Le Paléolithique supérieur en Europe
No full textMontet-White Anta. F. Djindjian , J. Kozlowski et M. Otte Le Paléolithique supérieur en Europe. In: Bulletin de la Société préhistorique française, tome 97, n°4, 2000. pp. 670-672
5e Colloque international sur le silex. Bordeaux, 27 septembre-2 octobre 1987
No full textMontet-White Anta. 5e Colloque international sur le silex. Bordeaux, 27 septembre-2 octobre 1987. In: Les Nouvelles de l'archéologie, n°30, Hiver 87-88 1988. pp. 60-61
5e Colloque international sur le silex. Bordeaux, 27 septembre-2 octobre 1987
No full textMontet-White Anta. 5e Colloque international sur le silex. Bordeaux, 27 septembre-2 octobre 1987. In: Les Nouvelles de l'archéologie, n°30, Hiver 87-88 1988. pp. 60-61
Franchthi Cave and Paralia, Maps, Plans, and Sections. T. W. Jacobsen and W. R. Farrand. Excavations at Franchthi Cave, Greece, Fascicle 1. Indiana University Press, Bloomington, 1987. xiii + 33 pp., figures, illustrations, maps, tables, notes, appendixes, references cited. 35.00 (paper).
No full textLes industries du Mesolithique et du Neolithique Initial. Les Industries lithiques taillées de Franchthi (Argolide, Grèce), Tome II. Catherine Perles. Excavations at Franchthi Cave, Greece, Fascicle 5. Indiana University Press, Bloomington, 1990. xii + 183 pp., tables, figures, bibliography. 45.00 (paper).
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L'industrie gravettienne de Kadar en Bosnie du Nord (Yougoslavie)
No full textMontet-White Anta, Basler Djuro. L'industrie gravettienne de Kadar en Bosnie du Nord (Yougoslavie). In: Bulletin de la Société préhistorique française. Études et travaux, tome 74, n°2, 1977. pp. 531-544
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