Zobrazeno 1 - 10
of 27
pro vyhledávání: '"David A. Boboltz"'
Autor:
Alan L. Fey, Alison B. Peck, David Gordon, Chopo Ma, David A. Boboltz, Anthony Beasley, Ralph A. Gaume, Christopher S. Jacobs, Patrick Charlot, Oleg Titov
Publikováno v:
The Astronomical Journal
The Astronomical Journal, American Astronomical Society, 2016, 151 (6), pp.id. 154. ⟨10.3847/0004-6256/151/6/154⟩
The Astronomical Journal, American Astronomical Society, 2016, 151 (6), pp.id. 154. ⟨10.3847/0004-6256/151/6/154⟩
International audience; Six very successful Very Long Baseline Array (VLBA) calibrator survey campaigns were run between 1994 and 2007 to build up a large list of compact radio sources with positions precise enough for use as very long baseline inter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6286867bb64e48fcfebc95509ec02ba8
https://europepmc.org/articles/PMC6010998/
https://europepmc.org/articles/PMC6010998/
Autor:
Patrick Charlot, L. D. Zhang, David A. Boboltz, B. J. Geldzahler, G. E. Lanyi, Alan L. Fey, Edward B. Fomalont, O. J. Sovers, Christopher S. Jacobs, C. J. Naudet, Chopo Ma, David Gordon, Jonathan D. Romney
Publikováno v:
The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2010, 139 (5), pp.1713-1770. ⟨10.1088/0004-6256/139/5/1713⟩
The Astrophysical Journal, American Astronomical Society, 2010, 139 (5), pp.1713-1770. ⟨10.1088/0004-6256/139/5/1713⟩
We have measured the sub-milli-arcsecond structure of 274 extragalactic sources at 24 and 43 GHz in order to assess their astrometric suitability for use in a high frequency celestial reference frame (CRF). Ten sessions of observations with the Very
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::415fbe9801ab36ce872460043024d0d9
https://doi.org/10.1088/0004-6256/139/5/1713
https://doi.org/10.1088/0004-6256/139/5/1713
Publikováno v:
The Astronomical Journal. 135:2194-2198
Using both the Very Large Array (VLA) at 7mm wavelength, and the Australia Telescope Compact Array (ATCA) at 3mm, we have searched for microwave emission from from cool dust in the extrasolar planetary system Gliese 876 (Gl 876). Having detected no e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7201511a286407f6c6bfeb4864de81f
https://doi.org/10.1088/0004-6256/135/6/2194
https://doi.org/10.1088/0004-6256/135/6/2194
Autor:
Markus Wittkowski, Florentin Millour, Michael Scholz, David A. Boboltz, Thomas Driebe, J.-B. Le Bouquin, Keiichi Ohnaka
Publikováno v:
Astronomy & Astrophysics. 479:L21-L24
Aims: We present J, H, K interferometry with a spectral resolution of 35 for the Mira variable S Orionis. We aim at measuring the diameter variation as a function of wavelength that is expected due to molecular layers lying above the continuum-formin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a404f1732044abc0ce8ed8100e8a5b51
https://doi.org/10.1051/0004-6361:20079237
https://doi.org/10.1051/0004-6361:20079237
Autor:
Brian Chaboyer, Jo Eliza Pitesky, Louis E. Strigari, Joseph Catanzarite, Angelle Tanner, Dayton L. Jones, Michael Shao, Geoffrey W. Marcy, Guy Worthey, David R. Ciardi, Edward J. Shaya, Ronald J. Allen, Stephen J. Edberg, David A. Boboltz, Debra A. Fischer, Nicholas M. Law, Xiaopei Pan, Andreas Quirrenbach, Stephen C. Unwin, Charles A. Beichman, Steven R. Majewski, Alan L. Fey, Ann E. Wehrle, Carl J. Grillmair, Christopher R. Gelino, Richard J. Patterson, Shrinivas R. Kulkarni, Kenneth J. Johnston, Stuart Shaklan, Todd J. Henry, John A. Tomsick, Kathryn V. Johnston, Andrew Gould, Rob P. Olling, Valeri V. Makarov, David L. Meier
Publikováno v:
Publications of the Astronomical Society of the Pacific. 120:38-88
Precision astrometry at microarcsecond accuracy has application to a wide range of astrophysical problems. This paper is a study of the science questions that can be addressed using an instrument that delivers parallaxes at about 4 microarcsec on tar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d23b93fc5a277b0a3e72dc8fe5b3281
https://doi.org/10.1086/525059
https://doi.org/10.1086/525059
Autor:
David A. Boboltz, Keiichi Ohnaka
Publikováno v:
Astronomy & Astrophysics. 478:809-814
We present multi-epoch high-angular resolution observations of 22 GHz H2O masers toward the silicate carbon star EU And to probe the spatio-kinematic distribution of oxygen-rich material. EU And was observed at three epochs (maximum time interval of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c396054795e0b253a14421ad06449dc8
https://doi.org/10.1051/0004-6361:20079030
https://doi.org/10.1051/0004-6361:20079030
Autor:
Simon Garrington, Ralph A. Gaume, Kenneth J. Johnston, P. Thomasson, David A. Boboltz, Alan L. Fey
Publikováno v:
The Astronomical Journal. 131:1084-1089
We report accurate positions in the International Celestial Reference Frame (ICRF) for 11 radio stars. Observations were made using the Multi-Element Radio Linked Interferometer Network at a radio frequency of 5 GHz. The positions are estimated to be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04f7ddec4d15b7dea0ef4bd25d0c62e5
https://doi.org/10.1086/498722
https://doi.org/10.1086/498722
Autor:
David A. Boboltz, Markus Wittkowski
Publikováno v:
The Astrophysical Journal. 618:953-961
We present the first coordinated VLBA/VLTI measurements of the stellar diameter and circumstellar atmosphere of a Mira variable star. Observations of the v=1, J=1-0 (43.1 GHz) and v=2, J=1-0 (42.8 GHz) SiO maser emission toward the Mira variable S Or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49d6d85262c9485943faa0e7320e0f15
https://doi.org/10.1086/426107
https://doi.org/10.1086/426107
Autor:
David A. Boboltz, Norbert Zacharias, Ralph A. Gaume, Mark J. Claussen, K. J. Johnston, C. de Vegt, Alan L. Fey
Publikováno v:
The Astronomical Journal. 126:484-493
We have used the Very Large Array, linked with the Pie Town Very Long Baseline Array antenna, to determine astrometric positions of 19 radio stars in the International Celestial Reference Frame (ICRF). The positions of these stars were directly linke
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bee3ab6f0f4af6f36f67ebc81f302c1
https://doi.org/10.1086/375462
https://doi.org/10.1086/375462
Autor:
David A. Boboltz, K. B. Marvel
Publikováno v:
The Astrophysical Journal. 545:L149-L152
We have discovered a new peak of emission in the v = 1, J = 1-0, SiO maser spectrum of the supergiant NML Cygni. This new peak of emission is blueshifted by ~18 km s-1 from the previously detected SiO masers around VLSR ≈ 0 km s-1. A double-peaked
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04718b7781014cc7d007de2f82913646
https://doi.org/10.1086/317895
https://doi.org/10.1086/317895