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46 papers · 2 filters
Photospheric diagnostics of core helium burning in giant stars
Keith Hawkins, Yuan-Sen Ting, Hans-Walter Rix
Core helium burning primary red clump (RC) stars are evolved red giant stars which are excellent standard candles. As such, these stars are routinely used to map the Milky Way or d…
The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). III. Extended Radio Emission from Protostars in Perseus
Łukasz Tychoniec, John J. Tobin, Agata Karska +8
Centimeter continuum emission from protostars offers insight into the innermost part of the outflows, as shock-ionized gas produces free-free emission. We observed a complete popul…
Signatures of unresolved binaries in stellar spectra: implications for spectral fitting
Kareem El-Badry, Hans-Walter Rix, Yuan-Sen Ting +5
The observable spectrum of an unresolved binary star system is a superposition of two single-star spectra. Even without a detectable velocity offset between the two stellar compone…
Multi-epoch VLTI-PIONIER imaging of the supergiant V766 Cen: Image of the close companion in front of the primary
M. Wittkowski, F. J. Abellan, B. Arroyo-Torres +10
The star V766 Cen (=HR 5171A) was originally classified as a yellow hypergiant but lately found to more likely be a 27-36 Msun red supergiant (RSG). Recent observations indicated a…
Molecular gas in debris disks around young A-type stars
A. Moór, M. Curé, Á. Kóspál +9
According to the current paradigm of circumstellar disk evolution, gas-rich primordial disks evolve into gas-poor debris disks compose of second-generation dust. To explore the tra…
Interferometric view of the circumstellar envelopes of northern FU Orionis-type stars
O. Fehér, Á. Kóspál, P. Ábrahám +2
FU Orionis-type objects are young, low-mass stars with large outbursts in visible light that last for several years or decades. They are thought to represent an evolutionary phase…