Results 81 to 90 of about 14,826 (213)

Pre-main sequence variable stars in young open cluster NGC 1893

, 2012
We present results of multi-epoch (fourteen nights during 2007-2010) $V$-band photometry of the cluster NGC 1893 region to identify photometric variable stars in the cluster. The study identified a total of 53 stars showing photometric variability.
A. K. Pandey, Appenzeller, Baraffe, Bessell, Bouvier, Bouvier, Breger, Carpenter, Chauhan, Chauhan, Cohen, Donati, Edwards, G. Maheswar, Gaze, Girardi, Grankin, Grankin, Haisch, Herbst, Herbst, Herbst, Hiltner, Kurtz, Lada, Landolt, Lata, Lenz, Littlefair, Littlefair, Lomb, Maheswar, Marco, Marco, Marconi, Massey, Meyer, Neelam Chauhan, Negueruela, Percy, Percy, Prisinzano, Robitaille, Scargle, Schaefer, Sharma, Siess, Sneh Lata, Stetson, Stetson, Vallenari, W. P. Chen, Zhang, Zwintz, Zwintz, Zwintz   +55 more
core   +1 more source

Pre-main sequence stars in the Lagoon Nebula (M8) [PDF]

, 2006
We report the discovery of new pre-main sequence (PMS) stars in the Lagoon Nebula (M8) at a distance of 1.25 kpc, based on intermediate resolution spectra obtained with the Boller & Chivens spectrograph at the 6.5-m Magellan I telescope (Las Campanas ...
Arias, Bally, Barbá, Basri, Cieza, Damiani, Drew, Hartigan, Hernández, Hirth, Hirth, J. I. Arias, Jacoby, Kenyon, Kun, Kwan, Lada, Lightfoot, Martín, Martín, Martín, Meyer, Mundt, N. I. Morrell, Palla, Pickles, Prisinzano, R. H. Barbá, Rieke, Skrutskie, Sung, Torres-Dodgen, Tothill, Van Den Ancker, Walker, White   +35 more
core   +4 more sources

Structure and Computation

Noûs, EarlyView.
ABSTRACT It is a truism of mathematics that differences between isomorphic number systems are irrelevant to arithmetic. This truism is deeply rooted in the modern axiomatic method and underlies most strands of arithmetical structuralism, the view that arithmetic is about some abstract number structure.
Balthasar Grabmayr
wiley   +1 more source

Variable X-Ray Emission of the Planet Hosting T Tauri Star CI Tau

The Astronomical Journal
We report results of Chandra X-ray observations of CI Tau, a young magnetically active classical T Tauri star for which previous studies have reported periodic variability attributed to a massive planet in a short-period orbit.
Stephen L. Skinner, Manuel Güdel
doaj   +1 more source

A LAMOST Spectroscopic Study of T Tauri Stars in the Orion OB1a Subassociation

The Astronomical Journal, 2023
We present a spectroscopic analysis of T Tauri stars (TTSs) observed with the wide-field multifiber spectrograph LAMOST in the substellar associations Ori OB1a located in the Orion Star-forming Complex.
Jesús Hernández, Luisa F. Zamudio, César Briceño, Nuria Calvet, Zhaohuan Zhu, Haibo Yuan, Xiaowei Liu, Ezequiel Manzo-Martínez, Carlos G. Román-Zúñiga, Javier Serna, Karina Maucó, Lucía Adame   +11 more
doaj   +1 more source

XMM-Newton observations of the sigma Ori cluster. II. Spatial and spectral analysis of the full EPIC field

, 2005
We present the results of an XMM-Newton observation of the young (~2-4 Myr) cluster around the hot star sigma Orionis. In a previous paper we presented the analysis of the RGS spectrum of the central hot star; here we discuss the results of the analysis ...
Argiroffi, Argiroffi, Baraffe, Barrado y Navascués, Barrado y Navascués, Barrado y Navascués, Berghöfer, Brown, Burningham, Béjar, Béjar, Béjar, Caballero, Damiani, E. Franciosini, Favata, Feigelson, Feigelson, Flaccomio, Flaccomio, Flaccomio, Flaccomio, Gagné, Garmire, Garmire, Getman, Hasinger, Hesser, Imanishi, Imanishi, J. Sanz-Forcada, Kastner, Kastner, Kenyon, Kenyon, Lavalley, Lee, Leggett, Martín, Mokler, Muzerolle, Neuhäuser, Oliveira, Oliveira, Oliveira, Ozawa, Pallavicini, Preibisch, Preibisch, Preibisch, R. Pallavicini, Ramírez, Randich, Sanz-Forcada, Scelsi, Schmitt, Scholz, Sherry, Siess, Skinner, Stassun, Stelzer, Stelzer, Stelzer, Stelzer, Tozzi, Walter, Weaver, Zapatero Osorio, Zapatero Osorio   +69 more
core   +1 more source

Oscillations of the Boundary Layer and High-frequency QPOs

EPJ Web of Conferences, 2014
We observed persistent high-frequency oscillations of the boundary layer near an accreting, weakly-magnetized star in global 3D MHD simulations. The tilted dipole magnetic field is not strong enough to open a gap between the star and the disk.
Blinova A. A., Bachetti M., Romanova M. M.   +2 more
doaj   +1 more source

Inclination effects in T Tauri star spectra [PDF]

, 2013
CONTEXT. Because of the presence of rotation and accretion disks, classical T Tauri stars have symmetry planes that are normally inclined relative to the plane of the sky.
Appenzeller, Immo, Bertout, Claude
core   +1 more source

ACROSS LANGUAGE BORDERS: WRITING INTEGRATION AND BELONGING IN KINDERTRANSPORT DIARIES

German Life and Letters, Volume 79, Issue 2, Page 129-147, April 2026.
ABSTRACT The diaries of six Kindertransport refugees who fled Nazi persecution in Germany and Austria to Britain in 1938 and 1939 offer unique insights into how language use reflects negotiations of identity and belonging. Moving beyond traditional concepts of bilingualism, a translingual framework reveals how these young refugees navigated between ...
Monja Stahlberger
wiley   +1 more source

T Tauri stars in blue

The Astronomical Journal, 1993
We present an atlas of 96 low dispersion spectra of T Tauri stars, both classical and weak-lined. The flux-calibrated spectra extend from Hβ to well blueward of the Balmer jump. Observed equivalent widths and rough blue veilings are presented. We model stars with excess emission as a combination of a weak-lined T Tauri star of a similar spectral type ...
Jeff A. Valenti, Gibor Basri, Christopher M. Johns   +2 more
openaire   +1 more source