Search Results - "Lepine, J. D. R."

A new method for estimating the pattern speed of spiral structure in the Milky Way by Junqueira, T. C., Chiappini, C., Lépine, J. R. D., Minchev, I., Santiago, B. X.

“…In the last few decades, many efforts have been made to understand the effect of spiral arms on the gas and stellar dynamics in the Milky Way disc. One of the…”
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The onset of large-scale turbulence in the interstellar medium of spiral galaxies by Falceta-Goncalves, D, Bonnell, I, Kowal, G, Lepine, J R D, Braga, C A S

“…Turbulence is ubiquitous in the interstellar medium (ISM) of the Milky Way and other spiral galaxies. The energy source for this turbulence has been much…”
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Oxygen abundance distribution in the Galactic disc by Korotin, S. A., Andrievsky, S. M., Luck, R. E., Lépine, J. R. D., Maciel, W. J., Kovtyukh, V. V.

“…We performed a non-local thermodynamic equilibrium (NLTE) analysis of the infrared oxygen triplet for a large number of Cepheid spectra obtained with the…”
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Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection by Lefloch, Bertrand, Vastel, C., Viti, S., Jimenez-Serra, I., Codella, C., Podio, L., Ceccarelli, C., Mendoza, E., Lepine, J. R. D., Bachiller, R.

“…As part of the Large Program Astrochemical Surveys At IRAM, we have used the IRAM 30 m telescope to lead a systematic search for the emission of rotational…”
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The corotation gap in the Galactic H i distribution by Amôres, E. B., Lépine, J. R. D., Mishurov, Yu. N.

“…We used the H i data from the LAB Survey to map the ring-shaped gap in H i density that lies slightly outside the solar circle. Adopting R0= 7.5 kpc, we find…”
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A mechanism for the formation of oxygen and iron bimodal radial distribution in the disc of our Galaxy by Acharova, I. A., Lépine, J. R. D., Mishurov, Yu. N., Shustov, B. M., Tutukov, A. V., Wiebe, D. S.

“…Recently, it has been proposed that there are two type Ia supernova progenitors: short-lived and long-lived. On the basis of this idea, we develop a theory of…”
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A Galactic ring of minimum stellar density near the solar orbit radius by Barros, D. A., Lépine, J. R. D., Junqueira, T. C.

“…We analyse the secular effects of a long-lived Galactic spiral structure on the stellar orbits with mean radii close to the corotation resonance. By…”
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Barium abundances in Cepheids by Andrievsky, S. M., Lépine, J. R. D., Korotin, S. A., Luck, R. E., Kovtyukh, V. V., Maciel, W. J.

“…We derived the barium atmospheric abundances for a large sample of Cepheids, comprising 270 stars. The sample covers a large range of Galactocentric distances,…”
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Updated parameters of 1743 open clusters based on Gaia DR2 by Dias, W S, Monteiro, H, Moitinho, A, Lépine, J R D, Carraro, G, Paunzen, E, Alessi, B, Villela, L

“…ABSTRACT In this study, we follow up our recent paper (Monteiro et al. 2020) and present a homogeneous sample of fundamental parameters of open clusters in our…”
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Overlapping abundance gradients and azimuthal gradients related to the spiral structure of the Galaxy by Lépine, J. R. D., Cruz, P., Scarano Jr, S., Barros, D. A., Dias, W. S., Pompéia, L., Andrievsky, S. M., Carraro, G., Famaey, B.

“…The connection between some features of the metallicity gradient in the Galactic disc, best revealed by Open Clusters and Cepheids, and the spiral structure,…”
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Radial metallicity distribution breaks at corotation radius in spiral galaxies by Scarano, S., Lépine, J. R. D.

“…We analysed the relation between the corotation radii and the galactic radii at which breaks or changes of slope of the metallicity gradients occur in spiral…”
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A GALAXY MODEL FROM TWO MICRON ALL SKY SURVEY STAR COUNTS IN THE WHOLE SKY, INCLUDING THE PLANE by POLIDO, P, Jablonski, F, Lepine, J R D

“…We use the star count model of Ortiz & Lepine to perform an unprecedented exploration of the most important Galactic parameters comparing the predicted counts…”
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The spiral pattern rotation speed of the Galaxy and the corotation radius with Gaia DR2 by Dias, W S, Monteiro, H, Lépine, J R D, Barros, D A

“…ABSTRACT In this work we revisit the issue of the rotation speed of the spiral arms and the location of the corotation radius of our Galaxy. This research was…”
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Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior by Monteiro, H, Dias, W S, Moitinho, A, Cantat-Gaudin, T, Lépine, J R D, Carraro, G, Paunzen, E

“…ABSTRACT Reliable fundamental parameters of open clusters (OCs) such as distance, age, and extinction are key to our understanding of Galactic structure and…”
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Direct Determination of the Spiral Pattern Rotation Speed of the Galaxy by Dias, Wilton S, Lépine, J. R. D

“…The rotation velocity of the spiral pattern of the Galaxy is determined by direct observation of the birthplaces of open clusters of stars in the Galactic disk…”
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Measurement of the epicycle frequency in the Galactic disc and initial velocities of open clusters by Lépine, J. R. D., Dias, Wilton S., Mishurov, Yu

“…A new method to measure the epicycle frequency κ in the Galactic disc is presented. We make use of the large data base on open clusters completed by our group…”
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Chemically tagging the Hyades stream: does it partly originate from the Hyades cluster? by Pompéia, L., Masseron, T., Famaey, B., Van Eck, S., Jorissen, A., Minchev, I., Siebert, A., Sneden, C., Lépine, J. R. D., Siopis, C., Gentile, G., Dermine, T., Pasquato, E., Van Winckel, H., Waelkens, C., Raskin, G., Prins, S., Pessemier, W., Hensberge, H., Frémat, Y., Dumortier, L., Bienaymé, O.

“…The Hyades stream has long been thought to be a dispersed vestige of the Hyades cluster. However, recent analyses of the parallax distribution, of the mass…”
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The spiral structure of the Galaxy revealed by CS sources and evidence for the 4:1 resonance by Lépine, J. R. D., Roman-Lopes, A., Abraham, Zulema, Junqueira, T. C., Mishurov, Yu. N.

“…We present a map of the spiral structure of the Galaxy, as traced by molecular carbon monosulphide (CS) emission associated with IRAS sources which are…”
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Astrometric and photometric study of Dias 4, Dias 6, and other five open clusters using ground-based and Gaia DR2 data by Dias, W S, Monteiro, H, Lépine, J R D, Prates, R, Gneiding, C D, Sacchi, M

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Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc – II by Andrievsky, S. M., Martin, R. P., Kovtyukh, V. V., Korotin, S. A., Lépine, J. R. D.

“…We have derived the abundances of 36 chemical elements in one Cepheid star, ASAS 181024-2049.6, located R G = 2.53 kpc from the Galactic Centre. This star…”
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