Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Stefan Uttenthaler"'
We follow-up on a previous finding that AGB Mira variables containing the 3DUP indicator technetium (Tc) in their atmosphere form a different sequence of K-[22] colour as a function of pulsation period than Miras without Tc. A near- to mid-infrared c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e258ebb11882154f342fa14c7184de52
https://lirias.kuleuven.be/handle/123456789/635463
https://lirias.kuleuven.be/handle/123456789/635463
Publikováno v:
Astronomische Nachrichten. 337:293-299
The semi-regular variable star RU Vulpeculae (RU Vul) is being observed visually since 1935. Its pulsation period and amplitude are declining since ∼1954. A leading hypothesis to explain the period decrease in asymptotic giant branch (AGB) stars su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db5d8297f473249d38bb6dd3e4825f19
https://doi.org/10.1002/asna.201512296
https://doi.org/10.1002/asna.201512296
Publikováno v:
Proceedings of the International Astronomical Union. 14:529-530
We follow up on a previous finding that Miras containing the third dredge-up (3DUP) indicator technetium (Tc) in their atmosphere form a different sequence of K – [22] colour as a function of pulsation period than Miras without Tc. A near-to-mid-in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a2ce829b8f7318f6e64ae75a520ab19
https://doi.org/10.1017/s1743921318006610
https://doi.org/10.1017/s1743921318006610
Autor:
A. A. Zijlstra, Eric Lagadec, Stefan Uttenthaler, Christian Johnson, Iain McDonald, Olivia Jones, Gregory C. Sloan, Christina L. Smith
We explore the wind-driving mechanism of giant stars through the nearby (117 pc), intermediate-luminosity ($L \approx 1600$ L$_\odot$) star EU Del (HIP 101810, HD 196610). APEX observations of the CO (3--2) and (2--1) transitions are used to derive a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dc98f8600f3d830b19268b5cd6b23db
http://arxiv.org/abs/1512.04695
http://arxiv.org/abs/1512.04695
Autor:
Bernhard Aringer, Josef Hron, Thomas Lebzelter, Stefan Uttenthaler, Günter Wiedemann, Claudia Paladini, D. Klotz
Context: Stars on the asymptotic giant branch (AGB) show broad evidence of inhomogeneous atmospheres and circumstellar envelopes. These have been studied by a variety of methods on various angular scales. In this paper we explore the envelope of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db36009b4ab4a23b1d8f4aadbc457880
http://arxiv.org/abs/1510.02680
http://arxiv.org/abs/1510.02680
Autor:
Robert Greimel, Bernhard Aringer, Lizette Guzman-Ramirez, Stefan Meingast, Thomas Lebzelter, Stefan Uttenthaler, Richard R. Joyce, Kenneth H. Hinkle
Context: The Mira variable LX Cyg showed a dramatic increase of its pulsation period in the recent decades and appears to undergo an important transition in its evolution. Aims: We aim at investigating the spectral type evolution of this star over th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e09f67f2c17cf4ea9a701d5a6643b1a
Autor:
Han Uitenbroek, Sofia Randich, Stefan Uttenthaler, Maurizio Busso, Laura Magrini, Enrico Maiorca
We present a new determination of the solar fluorine abundance together with abundance measurements of fluorine in two Galactic open clusters. We analyzed a sunspot spectrum, observed by L. Wallace and W. Livingston with the FTS at the McMath/Pierce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9459ffe507709b4360ab74fbf19f9da
Autor:
Bernhard Aringer, Josef Hron, Michael Gorfer, Hans-Ulrich Käufl, T. Lebzelter, Stefan Uttenthaler
Publikováno v:
Proceedings of the International Astronomical Union. 1:497-499
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2aeede21671b201f204f5c6d926ead73
https://doi.org/10.1017/s1743921305006332
https://doi.org/10.1017/s1743921305006332
Autor:
Stefan Uttenthaler
Aims: We report the discovery that Mira variables with and without absorption lines of the element technetium (Tc) occupy two different regions in a diagram of near- to mid-infrared colour versus pulsation period. Tc is an indicator of a recent or on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86121863faaf0d5b0e246291a313f88e
http://arxiv.org/abs/1306.5439
http://arxiv.org/abs/1306.5439
Autor:
D. A. García-Hernández, A. Yagüe, Maria Lugaro, Stefan Uttenthaler, Paolo Ventura, Olga Zamora, Amanda I. Karakas, David L. Lambert
We report the first spectroscopic identification of massive Galactic asymptotic giant branch (AGB) stars at the beginning of the thermal pulse (TP) phase. These stars are the most Li-rich massive AGBs found to date, super Li-rich AGBs with logE(Li)~3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31be15c8172d6b11aea647e7d37c62e1
http://arxiv.org/abs/1306.2134
http://arxiv.org/abs/1306.2134