Fwd: [Evntech] EVN Online Seminars: The sharpest view of the radio Universe
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From: Phillips, Chris (CASS, Marsfield) <"Phillips,>
Date: Wed, 27 Jan 2021 22:45:29 +0000
In case this is of interest
Begin forwarded message:
From: Benito Marcote <marcote_at_email.protectedve.eu>>
Subject: [Evntech] EVN Online Seminars: The sharpest view of the radio Universe
Date: 27 January 2021 at 21:10:47 AEDT
The European VLBI Network (EVN) is pleased to announce a new seminar from the series of online seminars “The sharpest view of the radio Universe: VLBI – Connecting Astronomers Worldwide”. These talks will illustrate how Very Long Baseline Interferometry can improve our understanding of many astronomical phenomena, from stars to galaxies, and the talks are aimed at a broad astronomical audience. Full information about the webinars, which will be run using Zoom, can be found at evlbi.org/evn-seminars<https://www.evlbi.org/evn-seminars>.
Sandra Etoka (Jodrell Bank Centre for Astrophysics & University of Manchester) will talk on
Friday 5 February at 15:00 CET about
Distance of optically-obscured evolved stars
The talk will be 35-40 min long, followed by a Q&A and discussion session. Attendants can join via Zoom following this link (Meeting ID: 885 4531 2932)<https://astron.zoom.us/j/88545312932>. The talk will also be streamed in real time via YouTube in the JIVE and EVN channel<https://youtu.be/KMZxi_qapOY>. Participants will be deferred to the YouTube channel after reaching the limit of 100 people on the Zoom session. Find attached the Calendar invitation or this link for Google Calendar<http://www.google.com/calendar/event?action=TEMPLATE&dates=20210205T140000Z/20210205T150000Z&text=EVN%20Seminar:%20Distance%20of%20optically-obscured%20evolved%20stars%20(Sandra%20Etoka)&location=&details=EVN%20Seminar.%0A%0APlease%20join%20in%20Zoom:%20https://astron.zoom.us/j/88545312932%0A%0Aor%20in%20YouTube%20via%20streaming:%20https://youtu.be/KMZxi_qapOY%0A%0AIn%20this%20seminar,%20Sandra%20Etoka%20(JBCA%20&%20U.%20Manchester)%20will%20talk%20about%20%E2%80%9CDistance%20of%20optically-obscured%20evolved%20stars%E2%80%9D.%0A%0AAbstract:%20As%20intermediate-mass%20stars%20head%20towards%20their%20final%20fate,%20they%20pass%20through%20the%20red-giant%20stage%20where%20they%20experience%20an%20increase%20of%20mass%20loss.%20This%20induces%20the%20creation%20of%20a%20circumstellar%20envelope%20of%20dust%20and%20gas.%20By%20the%20very%20end%20of%20this%20evolutionary%20stage,%20the%20amount%20of%20dust%20in%20the%20circumstellar%20envelope%20of%20a%20good%20fraction%20of%20these%20evolved%20stars%20is%20such%20that%20it%20blocks%20optical%20radiation,%20turning%20them%20into%20so-called%20OH/IR%20stars.%20These%20precursors%20of%20planetary%20nebulae%20are%20commonly%20observed%20throughout%20the%20Galaxy%20and%20are%20also%20observed%20in%20the%20Magellanic%20Clouds.%20Since%20optically%20thick,%20measurements%20of%20their%20distances%20using%20optical%20parallaxes%20as%20e.g.%20delivered%20by%20GAIA,%20is%20not%20possible.%20This%20issue%20can%20be%20circumvented%20thanks%20to%20maser%20emission.%20As%20their%20name%20gives%20it%20away,%20the%20physical%20conditions%20turn%20out%20to%20be%20ideal%20for%20a%20strong%20(1612-MHz)%20OH%20maser%20emission%20to%20be%20produced%20in%20the%20outer%20layers%20of%20the%20radially-expanding%20spherical%20circumstellar%20envelope%20of%20OH/IR%20stars.%20I%20will%20present%20how,%20combining%20single-dish%20monitoring%20and%20interferometric%20mapping%20of%20this%20OH%20maser%20emission,%20the%20%22phase-lag%20method%22%20allows%20us%20to%20measure%20their%20distance.>.
Please feel distribute this invitation to any mailing list, colleague, or scientist that you feel may be interested.
Abstract:
As intermediate-mass stars head towards their final fate, they pass through the red-giant stage where they experience an increase of mass loss. This induces the creation of a circumstellar envelope of dust and gas. By the very end of this evolutionary stage, the amount of dust in the circumstellar envelope of a good fraction of these evolved stars is such that it blocks optical radiation, turning them into so-called OH/IR stars. These precursors of planetary nebulae are commonly observed throughout the Galaxy and are also observed in the Magellanic Clouds. Since optically thick, measurements of their distances using optical parallaxes as e.g. delivered by GAIA, is not possible. This issue can be circumvented thanks to maser emission. As their name gives it away, the physical conditions turn out to be ideal for a strong (1612-MHz) OH maser emission to be produced in the outer layers of the radially-expanding spherical circumstellar envelope of OH/IR stars. I will present how, combining single-dish monitoring and interferometric mapping of this OH maser emission, the "phase-lag method" allows us to measure their distance.
On behalf of the EVN Seminars Organizing Committee,
the Joint Institute for VLBI ERIC and the University College Cork,
Denise Gabuzda (University College Cork)
Benito Marcote (Joint Institute for VLBI ERIC)
Anna Bartkiewicz (Torun Institute of Astronomy, Nicolaus Copernicus University)
Marcello Giroletti (INAF Instituto di Radioastronomia)
Miguel Pérez-Torres (Instituto de Astrofísica de Andalucía & CSIC)
[cid:67d5da79-6c79-4e0d-b3cc-ac5867704c97_at_email.protected
----------------------------------------------------------
Benito Marcote
EVN Support Scientist
Joint Institute for VLBI ERIC (JIVE)
Oude Hoogeveensedijk 4
7991 PD Dwingeloo, The Netherlands
Telephone: +31 (0) 521 596 508
Email: marcote_at_email.protected>
----------------------------------------------------------
Received on 2021-01-28 09:45:34
Date: Wed, 27 Jan 2021 22:45:29 +0000
In case this is of interest
Begin forwarded message:
From: Benito Marcote <marcote_at_email.protectedve.eu>>
Subject: [Evntech] EVN Online Seminars: The sharpest view of the radio Universe
Date: 27 January 2021 at 21:10:47 AEDT
The European VLBI Network (EVN) is pleased to announce a new seminar from the series of online seminars “The sharpest view of the radio Universe: VLBI – Connecting Astronomers Worldwide”. These talks will illustrate how Very Long Baseline Interferometry can improve our understanding of many astronomical phenomena, from stars to galaxies, and the talks are aimed at a broad astronomical audience. Full information about the webinars, which will be run using Zoom, can be found at evlbi.org/evn-seminars<https://www.evlbi.org/evn-seminars>.
Sandra Etoka (Jodrell Bank Centre for Astrophysics & University of Manchester) will talk on
Friday 5 February at 15:00 CET about
Distance of optically-obscured evolved stars
The talk will be 35-40 min long, followed by a Q&A and discussion session. Attendants can join via Zoom following this link (Meeting ID: 885 4531 2932)<https://astron.zoom.us/j/88545312932>. The talk will also be streamed in real time via YouTube in the JIVE and EVN channel<https://youtu.be/KMZxi_qapOY>. Participants will be deferred to the YouTube channel after reaching the limit of 100 people on the Zoom session. Find attached the Calendar invitation or this link for Google Calendar<http://www.google.com/calendar/event?action=TEMPLATE&dates=20210205T140000Z/20210205T150000Z&text=EVN%20Seminar:%20Distance%20of%20optically-obscured%20evolved%20stars%20(Sandra%20Etoka)&location=&details=EVN%20Seminar.%0A%0APlease%20join%20in%20Zoom:%20https://astron.zoom.us/j/88545312932%0A%0Aor%20in%20YouTube%20via%20streaming:%20https://youtu.be/KMZxi_qapOY%0A%0AIn%20this%20seminar,%20Sandra%20Etoka%20(JBCA%20&%20U.%20Manchester)%20will%20talk%20about%20%E2%80%9CDistance%20of%20optically-obscured%20evolved%20stars%E2%80%9D.%0A%0AAbstract:%20As%20intermediate-mass%20stars%20head%20towards%20their%20final%20fate,%20they%20pass%20through%20the%20red-giant%20stage%20where%20they%20experience%20an%20increase%20of%20mass%20loss.%20This%20induces%20the%20creation%20of%20a%20circumstellar%20envelope%20of%20dust%20and%20gas.%20By%20the%20very%20end%20of%20this%20evolutionary%20stage,%20the%20amount%20of%20dust%20in%20the%20circumstellar%20envelope%20of%20a%20good%20fraction%20of%20these%20evolved%20stars%20is%20such%20that%20it%20blocks%20optical%20radiation,%20turning%20them%20into%20so-called%20OH/IR%20stars.%20These%20precursors%20of%20planetary%20nebulae%20are%20commonly%20observed%20throughout%20the%20Galaxy%20and%20are%20also%20observed%20in%20the%20Magellanic%20Clouds.%20Since%20optically%20thick,%20measurements%20of%20their%20distances%20using%20optical%20parallaxes%20as%20e.g.%20delivered%20by%20GAIA,%20is%20not%20possible.%20This%20issue%20can%20be%20circumvented%20thanks%20to%20maser%20emission.%20As%20their%20name%20gives%20it%20away,%20the%20physical%20conditions%20turn%20out%20to%20be%20ideal%20for%20a%20strong%20(1612-MHz)%20OH%20maser%20emission%20to%20be%20produced%20in%20the%20outer%20layers%20of%20the%20radially-expanding%20spherical%20circumstellar%20envelope%20of%20OH/IR%20stars.%20I%20will%20present%20how,%20combining%20single-dish%20monitoring%20and%20interferometric%20mapping%20of%20this%20OH%20maser%20emission,%20the%20%22phase-lag%20method%22%20allows%20us%20to%20measure%20their%20distance.>.
Please feel distribute this invitation to any mailing list, colleague, or scientist that you feel may be interested.
Abstract:
As intermediate-mass stars head towards their final fate, they pass through the red-giant stage where they experience an increase of mass loss. This induces the creation of a circumstellar envelope of dust and gas. By the very end of this evolutionary stage, the amount of dust in the circumstellar envelope of a good fraction of these evolved stars is such that it blocks optical radiation, turning them into so-called OH/IR stars. These precursors of planetary nebulae are commonly observed throughout the Galaxy and are also observed in the Magellanic Clouds. Since optically thick, measurements of their distances using optical parallaxes as e.g. delivered by GAIA, is not possible. This issue can be circumvented thanks to maser emission. As their name gives it away, the physical conditions turn out to be ideal for a strong (1612-MHz) OH maser emission to be produced in the outer layers of the radially-expanding spherical circumstellar envelope of OH/IR stars. I will present how, combining single-dish monitoring and interferometric mapping of this OH maser emission, the "phase-lag method" allows us to measure their distance.
On behalf of the EVN Seminars Organizing Committee,
the Joint Institute for VLBI ERIC and the University College Cork,
Denise Gabuzda (University College Cork)
Benito Marcote (Joint Institute for VLBI ERIC)
Anna Bartkiewicz (Torun Institute of Astronomy, Nicolaus Copernicus University)
Marcello Giroletti (INAF Instituto di Radioastronomia)
Miguel Pérez-Torres (Instituto de Astrofísica de Andalucía & CSIC)
[cid:67d5da79-6c79-4e0d-b3cc-ac5867704c97_at_email.protected
----------------------------------------------------------
Benito Marcote
EVN Support Scientist
Joint Institute for VLBI ERIC (JIVE)
Oude Hoogeveensedijk 4
7991 PD Dwingeloo, The Netherlands
Telephone: +31 (0) 521 596 508
Email: marcote_at_email.protected>
----------------------------------------------------------
(image/jpeg attachment: Conference_poster_-_Etoka.jpeg)
- text/calendar attachment: EVNseminar-etoka.ics