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http://hdl.handle.net/20.500.12386/28301
Titolo: | Variability of water masers in evolved stars on timescales of decades | Autori: | BRAND, JAN Engels, Dieter Winnberg, Anders |
Data pubblicazione: | 2018 | Titolo del volume in cui è pubblicato il poster: | Astrophysical Masers: Unlocking the Mysteries of the Universe | Curatore/i del volume in cui è pubblicato il contributo: | Tarchi, Andrea; Reid, Mark J.; Castangia, Paola | Serie: | PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION | Numero: | vol. 13, S336 | Da pagina:: | 393 | Abstract: | For several decades (1987-2015) we have been carrying out observations of water masers in the circumstellar envelopes (CSE's) of Mira variables, Red Supergiants (RSG's) and Semi-Regular Variables (SRV's) with the Medicina 32-m and Effelsberg 100-m antennas. The single-dish monitoring observations provide evidence for strong H<SUB>2</SUB>O maser profile variations, which likely are connected to structural changes in the maser shells. Such variations include strong flares in intensity lasting several (tens of) months and systemic velocity gradients of maser components developing over years, as well as other secular variations which are superimposed on periodic variations following the stellar light variations. <P />When complemented with interferometric observations, it is possible to derive the 3-D distribution of the maser spots, and their lifetime, as we have done for RX Boo (Winnberg et al. 2008) and U Her (Winnberg et al. 2011; Brand et al. in prep.). | Titolo del convegno: | Astrophysical Masers: Unlocking the Mysteries of the Universe | Luogo del convegno: | Cagliari, Italy | Periodo del convegno: | 4-8 September, 2017 | URI: | http://hdl.handle.net/20.500.12386/28301 | URL: | https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/variability-of-water-masers-in-evolved-stars-on-timescales-of-decades/9D39BD0F5AE8D0A2D48955A454552BB3 | ISSN: | 1743-9213 | ISBN: | 978-1107192454 | DOI: | 10.1017/S1743921317009450 | Bibcode ADS: | 2018IAUS..336..393B | Fulltext: | open |
È visualizzato nelle collezioni: | 3.01 Contributi in Atti di convegno |
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