Výsledky vyhledávání - "J. Rolleston"

High-resolution spectroscopic observations of post-asymptotic giant branch candidates from the Edinburgh-Cape Survey

Autor: D. Kilkenny, Nigel Hambly, D. O'Donoghue, Jonathan Smoker, W. R. J. Rolleston, H.T. McGillivray, B.B. Lynn, Robert Ryans, Philip Dufton, Francis P. Keenan

Publikováno v: Monthly Notices of the Royal Astronomical Society. 363:911-917

High spectral resolution (R ∼ 40 000) and signal-to-noise optical spectra, obtained at the Very Large Telescope (VLT), are presented for three post-asymptotic giant branch (AGB) candidates selected from the Edinburgh-Cape (EC) Faint Blue Object Sur

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c2e65d53cbb665676dce1bd6de4a7603
https://doi.org/10.1111/j.1365-2966.2005.09496.x

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High-resolution spectroscopic observations of B-type stars from the Edinburgh-Cape Survey - III. Completion of a magnitude range limited survey

Autor: B.B. Lynn, Jonathan Smoker, Francis P. Keenan, D. O'Donoghue, D. Kilkenny, W. R. J. Rolleston, Robert Ryans, H.T. McGillivray, Nigel Hambly, Philip Dufton

Publikováno v: Monthly Notices of the Royal Astronomical Society. 353:633-638

High spectral resolution (R ∼ 40000) and signal-to-noise ratio observations of five high Galactic latitude early-type stars taken from the Edinburgh-Cape (EC) Faint Blue Object Survey are presented. These were required to complete a magnitude range

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d89924c9cc7c6e8733a358263ab10e61
https://doi.org/10.1111/j.1365-2966.2004.08091.x

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Ca ii K interstellar observations towards early-type disc and halo stars - distances to intermediate- and high-velocity clouds

Autor: W. R. J. Rolleston, H. R. M. Kay, Robert Ryans, Jonathan Smoker, Esteban Bajaja, W. G. L. Pöppel, C. J. Mooney, B.B. Lynn, P. M. W. Kalberla, Philip Dufton, Francis P. Keenan

Publikováno v: Monthly Notices of the Royal Astronomical Society. 352:1279-1290

We compare existing high spectral resolution (R=40,000) CaII K observations towards 88 mainly B-type stars, and new observations at R=10,000 towards 3 stars, with 21-cm HI emission-line profiles, in order to search for optical absorption towards know

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::21fd8446c1b43bf753cccb9639f62d2d
https://doi.org/10.1111/j.1365-2966.2004.08016.x

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High-resolution spectroscopy of globular cluster post-Asymptotic Giant Branch stars

Autor: Jonathan Smoker, Robert Ryans, Lawrence H. Aller, W. R. J. Rolleston, Carrie Trundle, C. J. Mooney, Francis P. Keenan, Philip Dufton

Publikováno v: Astronomy & Astrophysics. 419:1123-1132

We present model atmosphere analyses of high resolution Keck and VLT optical spectra for three evolved stars in globular clusters, viz. ZNG-1 in M 10, ZNG-1 in M 15 and ZNG-1 in NGC 6712. The derived atmospheric parameters and chemical compositions c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e8d5d77527719b31ad4a344ec76b0993
https://doi.org/10.1051/0004-6361:20040084

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Early-type stars in the Galactic halo from the Palomar-Green survey - III. Completion of a magnitude range limited sample

Autor: Francis P. Keenan, Jonathan Smoker, Rex A. Saffer, W. R. J. Rolleston, B.B. Lynn, Philip Dufton

Publikováno v: Monthly Notices of the Royal Astronomical Society. 349:821-832

High-resolution (R 40 000) echelle spectroscopic observations of 13 high-latitude early-type stars are presented. These stars comprise the final part of a complete magnitude range limited sample based on low-resolution spectroscopy of targets drawn f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::50f9013dff8edafafa27c647aa496c41
https://doi.org/10.1111/j.1365-2966.2004.07493.x

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Ca II K interstellar observations towards early-type disc and halo stars

Autor: H.T. McGillivray, H. R. M. Kay, W. R. J. Rolleston, Philip Dufton, Robert Ryans, Jonathan Smoker, M. Arnal, Donal O'Donoghue, Nigel Hambly, R. Morras, Francis P. Keenan, C. J. Mooney, D. Kilkenny

Publikováno v: Monthly Notices of the Royal Astronomical Society. 346:119-134

We present high-resolution (R = λ/Δλ ∼ 40 000) Ca II K interstellar observations (λ a i r = 3933.66 A) towards 88 mainly B-type stars, of which 74 are taken from the Edinburgh-Cape or Palomar-Green surveys, and 81 have‖b‖ > 25°. The majori

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::47fa3faa43fe38f581e569bfaf57ebb3
https://doi.org/10.1046/j.1365-2966.2003.07074.x

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High-resolution Keck I spectroscopy of Galactic halo post-asymptotic giant branch stars

Autor: Robert Ryans, W. R. J. Rolleston, C. J. Mooney, Philip Dufton, Francis P. Keenan, Jonathan Smoker, Lawrence H. Aller

Publikováno v: Monthly Notices of the Royal Astronomical Society. 337:851-860

Absolute and differential abundance analyses have been performed from high-resolution, high signal-to-noise ratio optical (Keck I) spectra for three evolved Galactic halo stars, namely PG 1704 + 222, HD 341617 and LS IV -04 01. Their derived atmosphe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e9c39535b0a771fa18d8e1463f4940cc
https://doi.org/10.1046/j.1365-8711.2002.05912.x

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The present-day chemical composition of the LMC

Autor: Carrie Trundle, Philip Dufton, W. R. J. Rolleston

Publikováno v: Astronomy & Astrophysics. 396:53-64

High-resolution observations of five OB-type main-sequence stars in the Large Magellanic Cloud (LMC) have been obtained with the UCLspectrograph on the 3.9-m Anglo-Australian Telescope. These spectra have been analysed using LTE model-atmosphere tech

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4928869a1adf1740e535128c1decd7b8
https://doi.org/10.1051/0004-6361:20021088

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A search for star formation around the Galactic halo B-type star PHL 346 with the 2dF spectrograph

Autor: W. R. J. Rolleston, Mike Irwin, Nigel Hambly, B.B. Lynn, Philip Dufton, Gerry Gilmore, Francis P. Keenan

Publikováno v: Monthly Notices of the Royal Astronomical Society. 336:1287-1292

A preliminary search for stars that may have formed coevally with the apparently young halo B-type star PHL 346 has been performed with the 2dF multifibre spectrograph on the Anglo-Australian Telescope (AAT). Candidates were selected for spectroscopy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::da2c6cda57592ce9371b13b55b593d20
https://doi.org/10.1046/j.1365-8711.2002.05866.x

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A search for circumstellar material around B-type stars in the Galactic halo

Autor: C. J. Mooney, Francis P. Keenan, W. R. J. Rolleston, H. R. M. Magee, Philip Dufton

Publikováno v: Monthly Notices of the Royal Astronomical Society. 336:1147-1154

19 B-type stars, selected from the Palomar-Green Survey, have been observed at infrared wavelengths to search for possible infrared excesses, as part of an ongoing programme to investigate the nature of early-type stars at high Galactic latitudes. Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4d9ab98a0e81310d70a39039a7322ed8
https://doi.org/10.1046/j.1365-8711.2002.05856.x

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