Splinter Meeting Stellar

Stellar Interactions

Time: Thursday September 24, 14:00-18:00 and Friday September 25, 09:00-13:00 and 14:00-18:00 CEST (UTC+2)

Room: virtual room M

Convenor(s): S. Geier [1], E. Günther [2], K. Poppenhäger [3], N. Reindl [1], V. Schaffenroth [1], H. Todt [1]
[1] U Potsdam, [2] TLS Tautenburg, [3] AIP

Stars are not formed in isolation. Their nurseries are large clouds of gas where they are born together interacting with each other and the material around them. Also in the later stages of their evolution various stellar interactions are common and important for many fields of astrophysics.
More than half of all stars have one of more companions and a significant fraction of those will at some point interact with each other. Those interactions can be rather gentle effects like irradiation or tidal deformation. But they can also be quite dramatic. Stars can transfer significant amounts of mass, swallow each other and form a common envelope or even merge altogether forming a single object. In the most extreme cases the mergers of stellar remnants can be detected as gravitational wave sources or gamma ray bursts. Close encounters of stars with supermassive black holes can eject stars out of their host galaxies or lead to tidal disruptions of the stars observed as transients.
Stars are not only interacting with each other, but also with their environment. Massive stars and stars in the late phases of their evolution lose significant amounts of mass via stellar winds and enrich the interstellar medium with nuclear processed material. Stellar explosions create shock waves and deposit large amounts of energy sometimes triggering the formation of new stars.
Stars also interact with the planetary systems around them in various ways. Tidal or magnetic interaction with Hot Jupiters can be expected through analogies to stellar binaries. Furthermore, stars can influence the gaseous atmospheres of their planets significantly. Especially in young systems the intense high-energy flux of the star may heat and evaporate the planetary atmosphere in part or even completely.
In this splinter session we aim at gathering an interdisciplinary group of experts to discuss most recent developments in the broad field of stellar interactions, share ideas and maybe form new collaborations.


Thursday September 24, 14:00-18:00 Stellar Interactions - Session I (virtual room M)

14:00  Welcome

Wide Binaries

14:05  Koushik Sen:
Case A mass transfer: A comprehensive study of their observable stellar properties

14:23  Ingrid Pelisoli:
Observational evidence that binary interaction is always required to form hot subdwarf stars

14:41  Joris Vos:
The impact of Galactic evolution on binary interactions, as shown in hot subdwarf binaries.

14:59  Olga Lebiga:
Investigating the effect of a circumbinary disk on Main Sequence star abundance patterns

15:17  Mathieu Renzo:
Kinematic and cosmetic consequences of (massive) binary interactions

15:35  Javier Alcolea:
The new orbital paramaters of the R Aqr symbiotic system

15:53  Break

16:23  Jane Pratt:
Convective overshooting in hydrodynamic simulations of the F-type eclipsing binary BW Aquarii


16:41  Thomas Kupfer:
Treasures from the Zwicky Transient Facility Galactic Plane observations

16:59  Harry Dawson:
The First Volume-Limited Complete Catalogue of Hot Subdwarf Stars

17:17  Jaroslav Merc:
Characterizing the symbiotic population using the Gaia data

17:35  Richard Culpan:
A Catalogue of Blue Horizontal Branch Stars from Gaia DR2

17:53  End

Friday September 25, 09:00-13:00 Stellar Interactions - Session II (virtual room M)

09:15  Welcome


09:20  J. D. Alvarado-Gómez:
Eruptive events in active stars: Lessons from numerical simulations

09:38  Nikoleta Ilic:
Measuring the tidal interaction footprint on stellar magnetic activity in star-planet systems

09:56  Grace Foster:
The corona of GJ 1151 in the context of star-planet interaction

10:14  Friedrich Röpke:
Formation of sdB stars in common envelope interaction with substellar companions

10:32  Veronika Schaffenroth:
A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008

10:50  Break

Stellar populations

11:20  N. Castro:
MYMST: Mapping the Youngest and most Massive Stars in the Tarantula nebula

11:38  Andreas Sander:
On the nature of WR-type mass loss in different environments

11:56  Varsha Ramachandran:
Massive star feedback in the Magellanic Clouds and the Bridge

12:14  Ekaterina Ilin:
From ZAMS to solar age: Calibrating the flaring-age-mass relation in open clusters

12:32  Banafsheh Shahzamanian:
Large-scale proper motion study of the Galactic Centre

12:50  Break

Friday September 25, 14:00-18:00 Stellar Interactions - Session III (virtual room M)

14:00  Welcome

Merger/Common envelope

14:05  Christian Sand:
Common-envelope evolution of an AGB star

14:23  Henri Boffin:
Post-common-envelope binary central star in planetary nebulae

14:41  Nicole Reindl:
An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2-428

14:59  Fiona Prodöhl:
Studying the atmosphere of the close binary star system AADor with PHOENIX/3D

15:17  Aldana Grichener:
High-Energy Neutrino Emission From Common Envelope Jets Supernova (CEJSN) impostors

15:35  Fabian Schneider:
Stellar mergers as the origin of magnetic massive stars

15:53  Break


16:23  Eva Laplace:
How being single or stripped in a binary affects the death of massive stars

16:41  Amir Michaelis:
3d simulations of the later phase of a merger-burst ILOT

16:59  Alexey Bobrick:
White Dwarf Neutron Star Binaries and the Transients they Produce

17:35  Lieke van Son:
Can Massive stars produce BHs with masses in the Pair-Instability Mass Gap?

17:53  Goodbye/End

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