ALMA2019: Science Results and Cross-Facility Synergies

Session

Stellar Evolution

V

14 Oct 2019, 17:55

T-Hotel Cagliari

Description

Chair of the session:

30. Solar Astronomy with ALMA

Dr Sven Wedemeyer

14/10/2019, 17:55

Invited Talk

Abstract:
"Solar observing with ALMA is offered as a non-standard mode since Cycle 4. The requirements for such observations are different from many other observations with ALMA in the sense that the mapped atmospheric layers of the Sun evolve on very short timescales and the primary beam being filled with complex emission. High-cadence (snapshot) imaging is needed for such a...

31. "Probing the thermal structure of the solar chromosphere with ALMA and optical/NIR observations "

Dr Dale Gary

14/10/2019, 18:20

Contributed talk

Abstract:
"ALMA is a powerful new instrument that allows an unambiguous determination of the solar chromospheric temperature, and its rapid evolution. When combined with multiwavelength observations in other diagnostics, most notably strong optical/NIR spectral lines, this allows us to probe the highly structured atmosphere throughout much of its height and with high spatial...

32. A cool puzzle in the solar atmosphere

Dr Stephen White

14/10/2019, 18:35

Contributed talk

Abstract:
While the nature of the heating mechanism that produces a rise in temperature just above the solar surface is a critical unsolved problem in astrophysics, the fact that the heated chromosphere contains pockets of material much cooler than their surroundings is also puzzling.
ALMA observations of the solar chromosphere are unique in providing direct electron...

78. ALMA observes the aftermath of mergers of non-compact stars

Dr Tomasz Kaminski

17/10/2019, 17:10

Invited talk

Abstract:
Red novae, a newly-recognized group of eruptive variable objects, are optical manifestations of merging non-compact stars than may be observed in real time. They represent transients erupting at luminosities intermediate between those of classical novae and supernovae. In red nova eruptions, stellar coalescence produces circumstellar environments very rich in molecular...

80. Shaping of the stellar wind of evolved red giants and their successors by (sub-)stellar binary companions

Dr Leen Decin

17/10/2019, 17:35

Contributed talk

Abstract:
Planetary nebulae (PNe) reveal a wide range of morphologies. Bipolarity is the main characteristic, but jets and tori are also detected. Several contending theories of the evolution from a (roughly) spherically symmetric Asymptotic Giant Branch (AGB) stellar wind to a very non-spherical PN have emerged. Here, we present the first high-spatial resolution...

81. ALMA unveils highly collimated jets in evolved stars

Dr Daniel Tafoya

17/10/2019, 17:50

Contributed talk

Abstract:
The mass-loss processes that occur during final stages of the evolution of low and intermediate-mass stars are of great relevance because they determine the ultimate fate of these stars, as well as the amount of mass and chemical composition of the material that will end up replenishing the interstellar medium. Thus, the study of these processes is important to...

82. HCN laser lines in carbon-rich evolved stars

Dr Ka Tat Wong

17/10/2019, 18:05

Contributed talk

Abstract:
HCN is one of the most abundant molecules in the circumstellar envelopes of carbon-rich AGB stars. Recent APEX surveys have revealed widespread presence of HCN maser emission in the innermost regions of these envelopes at millimetre wavelengths. Besides millimetre-range masers, HCN is also known to exhibit two intense lasers in the submillimetre frequencies near...

83. Tracing the mass loss history of WX Psc with ALMA and KVN

Dr Youngjoo Yun

17/10/2019, 18:20

Contributed talk

Abstract:
We present the combined results of ALMA and KVN (Korean VLBI Network) observations toward WX Psc (IRC+10011) which is a long-period variable OH/IR star. The SiO masers of v=1 and v=2, J=5-4, and the SiO thermal emission of v=0, J=5-4 were observed together with the H2O v2=1, 5(5,0)-6(4,3) and continuum emission at ALMA Band 6 in October 2017 (Cycle 5). This ALMA...