Results 51 to 60 of about 43,328 (216)

Orbits of Six Triple Systems

The Astronomical Journal
Joint analysis of position measurements and radial velocities of six triple stellar systems is conducted to determine their inner and/or outer orbits. Accumulation of such data is needed to study the architecture of stellar hierarchies and its relation ...
Andrei Tokovinin
doaj   +1 more source

Active Stars in the Spectroscopic Survey of Mid-to-late M Dwarfs within 15 pc

The Astronomical Journal, 2023
We present results from the volume-complete spectroscopic survey of 0.1–0.3 M _⊙ M dwarfs within 15 pc. This work discusses the active sample without close binary companions, providing a comprehensive picture of these 123 stars with H α emission stronger
Emily K. Pass, Jennifer G. Winters, David Charbonneau, Jonathan M. Irwin, Amber A. Medina   +4 more
doaj   +1 more source

The Long-period Spectroscopic Orbit and Dust Creation in the Wolf–Rayet Binary System WR 125

The Astrophysical Journal
Several long-period binaries with a carbon-rich Wolf–Rayet star and an OB star produce dust in their wind collisions. In eccentric binaries, this is seen most strongly near periastron passage.
Noel D. Richardson, Andrea R. Daly, Peredur M. Williams, Grant M. Hill, Victor I. Shenavrin, Izumi Endo, André-Nicolas Chené, Nicole Karnath, Ryan M. Lau, Anthony F. J. Moffat, Gerd Weigelt   +10 more
doaj   +1 more source

The VLT-FLAMES Tarantula Survey XXII. Multiplicity properties of the B-type stars [PDF]

, 2015
We investigate the multiplicity properties of 408 B-type stars observed in the 30 Doradus region of the Large Magellanic Cloud with multi-epoch spectroscopy from the VLT-FLAMES Tarantula Survey (VFTS).
Apellániz, J. Maíz, de Mink, S. E., Dufton, P. L., Dunstall, P. R., Evans, C. J., Howarth, I. D., Langer, N., Sana, H., Simón-Díaz, S., Taylor, W. D.   +9 more
core   +3 more sources

Spectroscopic Binaries Among λ Bootis-type Stars [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractThe small group of λ Bootis stars comprises late B to early F-type stars, with moderate to extreme (up to a factor 100) surface under-abundances of most Fe-peak elements and solar abundances of lighter elements (C, N, O, and S). The main mechanisms responsible for this phenomenon are atmospheric diffusion, meridional mixing, and accretion of ...
Olga Pintado, Ulrike Heiter, Ilian Iliev, Inga Kamp, Luciano Fraga, Ernst Paunzen, Ernst Paunzen   +6 more
openaire   +2 more sources

The primordial binary population II: Recovering the binary population for intermediate mass stars in Sco OB2

, 2007
We characterize the binary population in the young and nearby OB association Scorpius OB2 using available observations of visual, spectroscopic, and astrometric binaries with intermediate-mass primaries.
A. G. A. Brown, Alencar, Andersen, Bahcall, Balega, Barbier-Brossat, Basri, Bate, Bertiau, Blaauw, Blaauw, Bouy, Brown, Brown, Buscombe, Chabrier, Chanamé, Chen, Close, Correia, Cruzalebes, de Bruijne, de Geus, de Zeeuw, Duflot, Duquennoy, Eggleton, Evans, Fryer, Fryer, Girardi, Gualandris, Hanson, Hartkopf, Heacox, Heacox, Heggie, Hillebrandt, Hills, Hoogerwerf, Hut, Jilinski, Jordi, Kouwenhoven, Kouwenhoven, Kraicheva, Kraus, Kraus, Kroupa, Kroupa, Kroupa, Kroupa, Kurosawa, L. Kaper, Levato, Lindegren, Lindroos, M. B. N. Kouwenhoven, Malkov, Mamajek, Mason, Mason, Mathieu, Mathis, McAlister, Meibom, Meynet, Miura, Oblak, Palla, Perryman, Perryman, Plummer, Portegies Zwart, Portegies Zwart, Preibisch, Preibisch, Preibisch, Robin, S. F. Portegies Zwart, Shatsky, Slesnick, Slettebak, Sowell, Svechnikov, Söderhjelm, Thackeray, Tokovinin, Tokovinin, van Albada, van den Heuvel, Vereshchagin, Verschueren, Worley, Worley, Yungelson   +95 more
core   +1 more source

The IACOB project. VI. On the elusive detection of massive O-type stars close to the ZAMS

, 2020
The apparent lack of massive O-type stars near the zero-age main sequence (at ages < 2 Myr) is a topic widely discussed. Different explanations for this elusive detection have been proposed, but no firm conclusions have been reached yet. We reassess this
Arias, J. I., Barbá, R. H., Castro, N., Cerviño, M., Haemmerlé, L., Herrero, A., Holgado, G., Lennon, D. J., Meynet, G., Simón-Díaz, S.   +9 more
core   +1 more source

A Radial Velocity Survey of the Cygnus OB2 Association [PDF]

, 2006
We conducted a radial velocity survey of the Cygnus OB2 Association over a 6 year (1999 - 2005) time interval to search for massive close binaries. During this time we obtained 1139 spectra on 146 OB stars to measure mean systemic radial velocities and ...
Andy J. Monson, B. Uzpen, Blaauw A., Blaauw A., Christopher L. Fryer, Comeron F., Daniel C. Kiminki, Dequennoy A., Hall D. S., Henry A. Kobulnicky, Jennifer S. Irwin, K. Kinemuchi, Kazarovets E. V., Knodlseder J., Leitherer C., Lennon D. J., Maeder A., Michael J. Pierce, Nations H. L., R. C. Berrington, Rios L. Y., Romano G., S. E. Woosley, Torres-Dodgen A. V., van der Woerd H., Vanbeveren D., Vanbeveren D., Voelcker K., Wegner W.   +28 more
core   +3 more sources

Spectroscopic binary frequency among CNO stars

The Astrophysical Journal Supplement Series, 1988
Les observations spectroscopiques de 35 etoiles de type OB ayant des anomalies de carbone, azote et oxygene sont presentees. Les vitesses radiales sont mesurees raie par raie pour chacune des etoiles. L'analyse statistique des resultats confirme que la frequence des binaires spectroscopiques de courte periode est plus grande chez les etoiles de type ...
Stella Malaroda, Beatriz Garcia, Hugo Levato, Nidia Morrell   +3 more
openaire   +2 more sources

TYC 3340-2437-1: A Quadruple System with a Massive Star

The Astrophysical Journal
Hierarchical massive quadruple systems are ideal laboratories for examining the theories of star formation, dynamical evolution, and stellar evolution.
Jiao Li, Chao Liu, Changqing Luo, Bo Zhang, Jiang-Dan Li, Jia-Dong Li, Zhan-Wen Han, Xue-Fei Chen, Xiao-Bin Zhang, Lu-Qian Wang, Min Fang, Li-Feng Xing, Xi-Liang Zhang, Chichuan Jin   +13 more
doaj   +1 more source