THE CHEMICAL COMPOSITION PECULIARITIES OF G, K GIANTS by T. V. Mishenina

“…The old and young disk giants, Ba- and CH- stars, CN-Week and CN-strong giants, R stars, Li-strong giants, SMR stars have been discussed.…”
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San Pedro meeting on Wide Field Variability Surveys: Some concluding comments by Feast Michael W.

“…The importance of understanding non-periodic phenomena in variable stars, particularly asymptotic giant branch variables and R Coronae Borealis stars, is stressed, especially for its relevance to mass-loss in which pulsation may only play a minor role.…”
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Investigating APOKASC Red Giant Stars with Abnormal Carbon-to-nitrogen Ratios by Erica Bufanda, Jamie Tayar, Daniel Huber, Sten Hasselquist, Richard R. Lane

“…Here, we show that at least 10% of red clump stars and red giant branch stars deviate from the standard relationship between [C/N] and mass. …”
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Massive Star Formation in the Ultraviolet Observed with the Hubble Space Telescope by Claus Leitherer

“…I present a case study of the extraordinary star cluster and giant H II region in the blue compact galaxy II Zw 40. …”
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The Molecular Exoskeleton of the Ring-like Planetary Nebula NGC 3132 by Joel H. Kastner, David J. Wilner, Paula Moraga Baez, Jesse Bublitz, Orsola De Marco, Raghvendra Sahai, Al Wootten

“…We propose that this two-ring structure is the remnant of an ellipsoidal molecular envelope of ejecta that terminated the progenitor star’s asymptotic giant branch evolution and was subsequently disrupted by a series of misaligned fast, collimated outflows or jets resulting from interactions between the progenitor and one or more companions.…”
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Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport? by Jamie Tayar, Facundo D. Moyano, Melinda Soares-Furtado, Ana Escorza, Meridith Joyce, Sarah L. Martell, Rafael A. García, Sylvain N. Breton, Stéphane Mathis, Savita Mathur, Vincent Delsanti, Sven Kiefer, Sabine Reffert, Dominic M. Bowman, Timothy Van Reeth, Shreeya Shetye, Charlotte Gehan, Samuel K. Grunblatt

“…For most low- and intermediate-mass stars, the rotation on the main sequence seems to be close to rigid. As these stars evolve into giants, the core contracts and the envelope expands, which should suggest a radial rotation profile with a fast core and a slower envelope and surface. …”
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THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED by Sneden, Christopher, Kim, Hwihyun, Mace, Gregory N., Kaplan, Kyle F., Lee, Hye-In, Oh, Heeyoung, Oh, Jae Sok, Pak, Soojong, Park, Chan, Pavel, Michael D., Yuk, In-Soo, Jaffe, Daniel T., Afsar, Melike, Frebel, Anna L.

“…From high resolution (R sime 45,000), high signal-to-noise ratio (S/N > 400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we have derived elemental abundances of two bright, well-known metal-poor halo stars: the red giant HD 122563 and the subgiant HD 140283. …”
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DISCOVERY OF A CANDIDATE FOR THE COOLEST KNOWN BROWN DWARF by Luhman, K. L., Bochanski, John J., Burgasser, Adam J.

“…Therefore, the companion could be either a brown dwarf that formed like a binary star or a giant planet that was born within a disk and has been dynamically scattered to a larger orbit.…”
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Small flow rate can supply inwardly migrating shortest-period planets by Taylor S.F.

“…The tidal dissipation strength in stars due to giant planets may be not greatly weaker than it is in binary stars.…”
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Stellar-mass black hole binaries as ULXs by Rappaport, S, Podsiadlowski, P, Pfahl, E

“…This is the case during core hydrogen burning and, to an even more pronounced degree, while the donor star ascends the giant branch, though the latter phases last only 5% of the main sequence phase. …”

TOI 4201 b and TOI 5344 b: Discovery of Two Transiting Giant Planets around M-dwarf Stars and Revised Parameters for Three Others by J. D. Hartman, G. Á. Bakos, Z. Csubry, A. W. Howard, H. Isaacson, S. Giacalone, A. Chontos, N. Narita, A. Fukui, J. P. de Leon, N. Watanabe, M. Mori, T. Kagetani, I. Fukuda, Y. Kawai, M. Ikoma, E. Palle, F. Murgas, E. Esparza-Borges, H. Parviainen, L. G. Bouma, M. Cointepas, X. Bonfils, J. M. Almenara, Karen A. Collins, Kevin I. Collins, Howard M. Relles, Khalid Barkaoui, Richard P. Schwarz, Ghachoui Mourad, Mathilde Timmermans, Georgina Dransfield, Artem Burdanov, Julien de Wit, Emmanuël Jehin, Amaury H. M. J. Triaud, Michaël Gillon, Zouhair Benkhaldoun, Keith Horne, Ramotholo Sefako, A. Jordán, R. Brahm, V. Suc, Steve B. Howell, E. Furlan, J. E. Schlieder, D. Ciardi, T. Barclay, E. J. Gonzales, I. Crossfield, C. D. Dressing, M. Goliguzova, A. Tatarnikov, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Stephanie Striegel, Avi Shporer, Andrew Vanderburg, Alan M. Levine, Veselin B. Kostov, David Watanabe

“…All five hosts have supersolar metallicities, providing further support for recent findings that, like for solar-type stars, close-in giant planets are preferentially found around metal-rich M-dwarf host stars. …”
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Correlations in Chromospheric and Coronal Activity Indicators of Giant Stars by Sara Crandall, Graeme H. Smith

“…There is a varied range of FUV emission among CHeB stars, indicating that giants in this phase may be exhibiting differences or cycles in outer atmospheric activity. …”
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SPECTROSCOPIC INVESTIGATIONS OF GALACTIC CLUSTERS WITH ASSOCIATED CEPHEID VARIABLES. II. NGC 5662 AND V CEN by I. A. Usenko, A. Yu. Kniazev, V. V. Kovtyukh, T. V. Mishenina, A. S. Miroshnichenko, D. G. Turner, Yu. I. Protsyuk

“…The main sequence stars and B-giants have abundances of C, N, and Na close to the solar one, while the cool supergiants and giants show a deficit of carbon, an overabundance of nitrogen, and a small overabundance or close to the solar sodium content. …”
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Examining the fluorine overabundance problem by conducting Jinping deep underground experiment by CHEN Yinji, ZHANG Liyong

“…The China Jinping Underground Laboratory (CJPL), which is the deepest operational underground laboratory in the world, offers unique ultra-low background conditions that facilitate the direct evaluation of the nuclear reactions occurring during the early evolution of stars.PurposeAsymptotic giant branch (AGB) stars are thought to be the major contributor to Galactic fluorine production. …”
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Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters by William V. Dixon

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Stellar Mass Black Hole Binaries as ULXs by Rappaport, S, Podsiadlowski, P, Pfahl, E

“…This is the case during core hydrogen burning and, to an even more pronounced degree, while the donor star ascends the giant branch, though the latter phases lasts only ~5% of the main sequence phase. …”

Evolved Massive Stars at Low Metallicity. VII. The Lower Mass Limit of the Red Supergiant Population in the Large Magellanic Cloud by Ming Yang, Bo Zhang, Biwei Jiang, Jian Gao, Yi Ren, Shu Wang, Man I Lam, Hao Tian, Changqing Luo, Bingqiu Chen, Jing Wen

“…Here, we assemble a spectroscopic evolved cool star sample with 6602 targets, including RSGs, asymptotic giant branch stars, and red giant branch stars, in the Large Magellanic Cloud based on Gaia DR3 and Sloan Digital Sky Survey IV/APOGEE-2. …”
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Revised Architecture and Two New Super-Earths in the HD 134606 Planetary System by Zhexing Li, Stephen R. Kane, Timothy D. Brandt, Tara Fetherolf, Paul Robertson, Jinglin Zhao, Paul A. Dalba, Robert A. Wittenmyer, R. Paul Butler, Matías R. Díaz, Steve B. Howell, Jeremy Bailey, Brad Carter, Elise Furlan, Crystal L. Gnilka, Jonathan Horner, Hugh R. A. Jones, Simon O’Toole, Chris Tinney

“…HD 134606 now displays four low-mass planets in a compact region near the star, one gas giant further out in the habitable zone, an additional companion in the outer regime, and a low-mass M dwarf stellar companion at large separation, making it an intriguing target for system formation/evolution studies. …”
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The Gemini NICI Planet-Finding Campaign: The Frequency of Giant Planets around Young B and A Stars by Nielsen, E, Liu, M, Wahhaj, Z, Biller, B, Hayward, T, Close, L, Males, JR, Skemer, A, Chun, M, Ftaclas, C, Alencar, S, Artymowicz, P, Boss, A, Clarke, F, Pino, E, Gregorio-Hetem, J, Hartung, M, Ida, S, Kuchner, M, Lin, D, Reid, I, Shkolnik, E, Tecza, M, Thatte, N, Toomey, D

“…Considering the contrast limits of our NICI data and the fact that we did not detect any planets, we use high-fidelity Monte Carlo simulations to show that fewer than 20% of 2 M_sun stars can have giant planets greater than 4 M_Jup between 59 and 460 AU at 95% confidence, and fewer than 10% of these stars can have a planet more massive than 10 M_Jup between 38 and 650 AU. …”

Common envelope ejection in massive binary stars - Implications for the progenitors of GW150914 and GW151226 by Kruckow, M, Tauris, T, Langer, N, Szecsi, D, Marchant, P, Podsiadlowski, P

“…</p> <h4>Results</h4> <p>In addition to producing double white dwarf and double neutron star binaries, CE evolution may also produce massive BH-BH systems with individual BH component masses of up to ~50 60 M⊙, in particular for donor stars evolved to giants beyond the Hertzsprung gap. However, the physics of envelope ejection of massive stars remains uncertain. …”