Zobrazeno 1 - 10
of 68
pro vyhledávání: '"J. F. Desmurs"'
Autor:
M. Gómez-Garrido, J. Alcolea, P. de Vicente, R. Soria-Ruiz, Valentin Bujarrabal, J. F. Desmurs
Context.Stars on the asymptotic giant branch (AGB) are long-period variables that present strong flux variations at almost all wavelengths, including the SiO maser lines. The periods of these variations are of 300–500 days in Mira-type stars and so
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd589b6fd7d632d8585802687bd2e5ca
http://arxiv.org/abs/2009.09771
http://arxiv.org/abs/2009.09771
Autor:
J. F. Desmurs, M. Gómez-Garrido, J. J. Díaz-Luis, Javier Alcolea, Valentin Bujarrabal, Miguel Santander-García
Publikováno v:
Proceedings of the International Astronomical Union. 14:186-190
The mass loss process along the AGB phase is crucial for the formation of circumstellar envelopes (CSEs), which in the post-AGB phase will evolve into planetary nebulae (PNe). There are still important issues that need to be further explored in this
Autor:
M. Gómez-Garrido, J. F. Desmurs, Javier Alcolea, Valentin Bujarrabal, A. Castro-Carrizo, Miguel Santander-García, J. J. Díaz-Luis
We aim to study the main properties of a volume-limited unbiased sample of well-characterized semi-regular variables (SRs) in order to clarify important issues, such as the formation of axially symmetric planetary nebulae (PNe) from spherical circums
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f77e69c4cc6c8d91aa00bed2be1fc4df
http://arxiv.org/abs/1907.09175
http://arxiv.org/abs/1907.09175
Autor:
Michael Lindqvist, J. F. Desmurs, Javier Alcolea, Valentin Bujarrabal, Pablo de Vicente, R. Soria-Ruiz
Publikováno v:
Scopus-Elsevier
OH231.8+4.2 is an archetypal pre-planetary nebulae (pPN). It is a binary system surrounded by bipolar nebula. Some years ago the authors extensively studied it and performed several VLBI observations from which they obtained mas-resolution maps of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e077f0c736159f8edc07021b6bd1db8b
http://arxiv.org/abs/1905.07219
http://arxiv.org/abs/1905.07219
Autor:
J. F. Desmurs, Javier Alcolea, Miguel Santander-García, Arancha Castro Carrizo, Valentin Bujarrabal, Marcelino Agúndez, C. Sanchez-Contreras
Publikováno v:
Proceedings of the International Astronomical Union. 14:343-344
We report on new molecular-line observations of the bipolar pre-planetary nebula M 1–92. The new IRAM 30 m MRT and NOEMA data shows the presence of shock induced chemistry in the nebula. From the derived [17O]/[18O] ratio, we suggest that the sudde
Autor:
Valentin Bujarrabal, Javier Alcolea, Per Bergman, Michael Lindqvist, R. Soria-Ruiz, J. F. Desmurs
Publikováno v:
Proceedings of 11th European VLBI Network Symposium & Users Meeting — PoS(11th EVN Symposium).
Publikováno v:
Astronomy & Astrophysics. 468:189-192
Context. OH 231.8+4.2 is a well studied preplanetary nebula (pPN) around a binary stellar system that shows a remarkable bipolar outflow. Aims. To study the structure and kinematics of the inner 10-80AU nebular regions probed by SiO and H 2 O maser e
Autor:
Francisco Colomer, Javier Alcolea, Valentin Bujarrabal, C. Sánchez Contreras, R. Soria-Ruiz, J. F. Desmurs
Publikováno v:
Proceedings of the International Astronomical Union. 3:271-278
SiO maser emission allows us to study the innermost circumstellar layers around AGB and post-AGB stars, at a few AU from the stellar photosphere, what is crucial to understand the mass loss process in AGB stars and the jet launching mechanisms in pos
Autor:
Francisco Colomer, Valentin Bujarrabal, J. F. Desmurs, K. B. Marvel, R. Soria-Ruiz, Javier Alcolea
Publikováno v:
Astronomy & Astrophysics. 432:L39-L42
We report the first VLBI map of the $v=0$ $J=$ 1–0 maser line of 29 SiO in the long-period variable star IRC +10011. We have found that this maser emission is composed of multiple spots distributed in an incomplete ring, suggesting that this maser
Autor:
Javier Alcolea, Philip J. Diamond, Valentin Bujarrabal, J.-F. Desmurs, Francisco Colomer, K. B. Marvel, R. Soria-Ruiz
Publikováno v:
Astronomy & Astrophysics. 426:131-144
We present sub-milliarcsecond observations of SiO masers in the late-type stars IRC +10011 and Chi Cyg. We have used the NRAO Very Long Baseline Array (VLBA) to map the 43 GHz (v=1, 2 J=1-0) and the 86 GHz (v=1, 2 J=2-1) SiO masers. All the transitio