VLBI for Gravity Probe B: The Guide Star IM Pegasi

Autor: M. F. Bietenholz, Irwin I. Shapiro, D. E. Lebach, M. I. Ratner, Norbert Bartel, R. R. Ransom

We review the radio very long baseline interferometry (VLBI) observations of the guide star, IM Peg, and three compact extragalactic reference sources, 3C 454.3, B2250+194, and B2252+172, made in support of the NASA/Stanford gyroscope relativity miss

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee1155ced8b2625a1b5c36cf4063ce09
http://arxiv.org/abs/1509.07529

Very Long Baseline Interferometry Imaging of the RS Canum Venaticorum Binary Star System HR 5110

Autor: R. R. Ransom, D. E. Lebach, J.-F. Lestrade, M. I. Ratner, Norbert Bartel, Irwin I. Shapiro, M. F. Bietenholz

Publikováno v: The Astrophysical Journal. 587:390-397

We present VLBI images of the RS CVn binary star HR 5110 (=BH CVn; HD 118216), obtained from observations made at 8.4 GHz on 1994 May 29/30 in support of the NASA/Stanford Gravity Probe B project. Our images show an emission region with a core-halo m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3e02f0ae5587437fe96df529a7fe62cc
https://doi.org/10.1086/368070

VLBI Imaging and Astrometry of the RS CVn Binary Star IM Pegasi

Autor: R.R. Ransom, J.-F. Lestrade, M. I. Ratner, D. E. Lebach, Norbert Bartel, M. F. Bietenholz, Irwin I. Shapiro

Publikováno v: Symposium - International Astronomical Union. 205:318-321

We have made 3.6 cm VLBI observations of the RS CVn binary star IM Pegasi (HR 8703) approximately four times per year since 1997 in support of the NASA/Stanford Relativity Gyroscope Experiment (Gravity Probe B). Phase-referenced maps reveal structura

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e8326241c690e371bf0cd471a45a4c15
https://doi.org/10.1017/s0074180900221359

High precision astrometry with closure constraints: The triplet 1803+784/1928+738/2007+777

Autor: J. M. Marcaide, Thomas P. Krichbaum, Robert A. Preston, A. Witzel, M. I. Ratner, Irwin I. Shapiro, Eduardo Ros, J. C. Guirado

Publikováno v: Vistas in Astronomy. 41:207-211

Improvements in the technique of high precision differential astrometry in VLBI based on the use of triangles of radio sources are reported. Such geometry provides new constraints by taking advantage of “closure”. Results on the relative separati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f4bd32e37947db8f5b4de9cc8f4374ab
https://doi.org/10.1016/s0083-6656(97)00007-x

VLBI FOR GRAVITY PROBE B . V. PROPER MOTION AND PARALLAX OF THE GUIDE STAR, IM PEGASI

Autor: J.-F. Lestrade, Irwin I. Shapiro, R. R. Ransom, D. E. Lebach, Michael Bietenholz, Norbert Bartel, M. I. Ratner

Publikováno v: Astrophysical Journal Supplement
Astrophysical Journal Supplement, American Astronomical Society, 2012, 201 (1), pp.5. ⟨10.1088/0067-0049/201/1/5⟩

We present the principal astrometric results of the very-long-baseline interferometry (VLBI) program undertaken in support of the Gravity Probe B (GP-B) relativity mission. VLBI observations of the GP-B guide star, the RS CVn binary IM Pegasi (HR 870

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c73f35eeaff8984a0d1997a1eb784639
https://hal.archives-ouvertes.fr/hal-02863734