REDISCUSSION OF PER100 CHANGE OF THE CLOSE BINARY V65l CASSIOPEIAE by Chun-Hwey Kim, Jae Woo Lee, Chung Uk Lee, Dong Ju Lee, Young Woon Kang

“…If the third body suggested in V65l Cas system exists really and is a main-sequence star, it is located at the end of the main-sequence.…”
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Stellar mergers as the origin of magnetic massive stars by Schneider, FRN, Ohlmann, ST, Podsiadlowski, P, Röpke, FK, Balbus, SA, Pakmor, R, Springel, V

“…It has been suggested that merging of main-sequence and pre-main-sequence stars could produce such strong fields4,5, and the predicted fraction of merged massive stars is also about ten per cent6,7. …”

Supernova SN 2011fe from an exploding carbon-oxygen white dwarf star. by Nugent, P, Sullivan, M, Cenko, S, Thomas, R, Kasen, D, Howell, D, Bersier, D, Bloom, J, Kulkarni, SR, Kandrashoff, M, Filippenko, A, Silverman, J, Marcy, G, Howard, A, Isaacson, H, Maguire, K, Suzuki, N, Tarlton, J, Pan, Y, Bildsten, L, Fulton, B, Parrent, J, Sand, D, Podsiadlowski, P, Bianco, F

“…There is consensus that a white dwarf star explodes after accreting matter in a binary system, but the secondary body could be anything from a main-sequence star to a red giant, or even another white dwarf. …”

Variable Blue Straggler Stars in the Open Cluster NGC 6819 Observed in the Kepler “Superstamp” Field by Joyce A. Guzik, Andrzej S. Baran, Sachu Sanjayan, Péter Németh, Anne M. Hedlund, Jason Jackiewicz, Lori R. Dauelsberg

“…The cluster contains “blue straggler” stars, i.e., stars on the main sequence above the cluster turnoff that should have left the main sequence to become red giants. …”
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Exploring the Chemistry and Mass Function of the Globular Cluster 47 Tucanae with New Theoretical Color–Magnitude Diagrams by Roman Gerasimov, Adam J. Burgasser, Ilaria Caiazzo, Derek Homeier, Harvey B. Richer, Matteo Correnti, Jeremy Heyl

“…We determined [O/Fe] for ∼5000 members below the main-sequence knee at the level of accuracy, comparable to the spectroscopic measurements of evolved members in the literature. …”
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Two Warm, Low-Density Sub-Jovian Planets Orbiting Bright Stars in K2 Campaigns 13 and 14 by Yu, Liang, Rodriguez, Joseph E., Eastman, Jason D., Crossfield, Ian Jm, Shporer, Abraham-Avi, Gaudi, B. Scott, Burt, Jennifer A, Fulton, Benjamin J., Sinukoff, Evan, Howard, Andrew W., Isaacson, Howard, Kosiarek, Molly R., Ciardi, David R., Schlieder, Joshua E., Penev, Kaloyan, Vanderburg, Andrew, Stassun, Keivan G., Bieryla, Allyson, Butler, R. Paul, Berlind, Perry, Calkins, Michael L., Esquerdo, Gilbert A., Latham, David W., Murawski, Gabriel, Stevens, Daniel J., Petigura, Erik A., Kreidberg, Laura, Bristow, Makennah

“…Both stars are G-Type stars, one of which is at or near the end of its main-sequence lifetime, and the other is just over halfway through its main-sequence lifetime. …”
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Spatially resolved star formation and inside-out quenching in the TNG50 simulation and 3D-HST observations by Nelson, Erica J, Tacchella, Sandro, Diemer, Benedikt, Leja, Joel, Hernquist, Lars, Whitaker, Katherine E, Weinberger, Rainer, Pillepich, Annalisa, Nelson, Dylan, Terrazas, Bryan A, Nevin, Rebecca, Brammer, Gabriel B, Burkhart, Blakesley, Cochrane, Rachel K, van Dokkum, Pieter, Johnson, Benjamin D, Marinacci, Federico, Mowla, Lamiya, Pakmor, Rüdiger, Skelton, Rosalind E, Speagle, Joshua, Springel, Volker, Torrey, Paul, Vogelsberger, Mark, Wuyts, Stijn

“…We compare the star-forming main sequence (SFMS) of galaxies – both integrated and resolved on 1 kpc scales – between the high-resolution TNG50 simulation of IllustrisTNG and observations from the 3D-HST slitless spectroscopic survey at z ∼ 1. …”
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Discovery and Characterization of Transiting Super Earths Using an All-Sky Transit Survey and Follow-up by the James Webb Space Telescope by Seager, Sara, Winn, Joshua Nathan, Deming, Drake, Miller-Ricci, Eliza, Clampin, M., Lindler, D., Greene, Tom, Charbonneau, David, Laughlin, G. P., Latham, David W., Ennico, K., Ricker, George R

“…Based on our estimates of these uncertainties, we project that JWST will be able to measure the temperature and identify molecular absorptions (water, CO[subscript 2]) in one to four nearby habitable TESS super Earths orbiting lower–main-sequence stars.…”
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Precise and Accurate Mass and Radius Measurements of Fifteen Galactic Red Giants in Detached Eclipsing Binaries by Dominick M. Rowan, Krzysztof Z. Stanek, Christopher S. Kochanek, Todd A. Thompson, Tharindu Jayasinghe, Jacqueline Blaum, Benjamin J. Fulton, Ilya Ilyin, Howard Isaacson, Natalie LeBaron, Jessica R. Lu, David V. Martin

“…In seven of our systems, both components have evolved off of the main sequence, and one system has a giant star component with a main sequence, Sun-like companion. …”
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Light curve modeling of the eclipsing binary systems V0876 Lyr, V3660 Oph, and V0988 Mon by Alenazi Moqbil S., Elkhateeb Magdy M.

“…Both components of the system V0876 Lyr and secondary components of the systems V3660 Oph and V0988 Mon show lower radii and luminosities than expected for Zero Age Main Sequence (ZAMS). Secondary components of the system, V3660 Oph and V0988 Mon, deviated from ZAMS and the Terminal-age Main Sequence (TAMS) with a higher radius and luminosity than expected for ZAMS and TAMS.…”
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Convection Theory and Relevant Problems in Stellar Structure, Evolution, and Pulsational Stability I Convection Theory and Structure of Convection Zone and Stellar Evolution by Da-run Xiong

“…The theoretical evolution tracks of massive stars run at higher luminosity and the main sequence band becomes noticeably wider in comparison with those calculated using the local mixing-length theory (MLT). …”
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Green valley galaxies by Salim S.

“…It corresponds to massive galaxies below the star-forming, “main” sequence, and therefore represents a critical tool for the study of the quenching of star formation and its possible resurgence in otherwise quiescent galaxies. …”
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Direct imaging of exoEarths embedded in clumpy debris disks by Defrere, D., Stark, C., Cahoy, K., Beerer, I.

“…Hence, the presence of large amounts of dust in the habitable zone around nearby main-sequence stars is considered as a major hurdle toward the direct imaging of exoEarths with future dedicated space-based telescopes. …”
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Optical spectroscopic classification and membership of young M dwarfs in star-forming regions by Riddick, F, Roche, P, Lucas, P

“…The indices are calibrated for young, pre-main-sequence objects whose spectra are affected by their lower surface gravities compared with those on the main sequence. …”

Supernova SN 2011fe from an exploding carbon-oxygen white dwarf star. by Nugent, P, Sullivan, M, Cenko, S, Thomas, R, Kasen, D, Howell, D, Bersier, D, Bloom, J, Kulkarni, SR, Kandrashoff, M, Filippenko, A, Silverman, J, Marcy, G, Howard, A, Isaacson, H, Maguire, K, Suzuki, N, Tarlton, J, Pan, Y, Bildsten, L, Fulton, B, Parrent, J, Sand, D, Podsiadlowski, P, Bianco, F

“…There is consensus that a white dwarf star explodes after accreting matter in a binary system, but the secondary body could be anything from a main-sequence star to a red giant, or even another white dwarf. …”

The EDGE-CALIFA Survey: Molecular Gas and Star Formation Activity across the Green Valley by Vicente Villanueva, Alberto D. Bolatto, Stuart N. Vogel, Tony Wong, Adam K. Leroy, Sebastian F. Sánchez, Rebecca C. Levy, Erik Rosolowsky, Dario Colombo, Veselina Kalinova, Serena Cronin, Peter Teuben, Mónica Rubio, Zein Bazzi

“…Of the 60 galaxies in ACA EDGE, 36 are on the star formation main sequence, 13 are on the red sequence, and 11 lie in the “green valley” transition between these sequences. …”
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Rotation and stellar evolution by Eggenberger P.

“…The effects of rotation on the evolution and properties of low-mass stars are first discussed from the pre-main sequence to the red giant phase. We then briefly indicate how some observational constraints available for these stars can help us progress in our understanding of the dynamical processes at work in stellar interiors.…”
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Effect of Rotation on Wave Mixing in Intermediate-mass Stars by A. Varghese, R. P. Ratnasingam, R. Vanon, P. V. F. Edelmann, S. Mathis, T. M. Rogers

“…Here, we study the effect of rotation on this wave mixing by considering a 7 M _⊙ model at zero-age main sequence and mid-main sequence. We compare the mixing profiles at a range of rotation rates (1 × 10 ^−5 , 2 × 10 ^−5 , 3 × 10 ^−5 , 4 × 10 ^−5 , and 1 × 10 ^−4 rad s ^−1 ) and observe that the mixing decreases with decreasing Rossby number. …”
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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

“…Besides the Cepheid, we studied one G-supergiant, two K-giants, four B-giants, and seven main sequence stars. Radial velocities (RV), v sin i, Teff, log g, and [Fe/H] were determined using model fitting. …”
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Semi-analytical Expression of G-mode Period Spacing: The Case of Brunt–Väisälä Frequency with Not a Jump but a Ramp by Yoshiki Hatta

“…To decipher complex patterns of gravity-mode period spacings observed for intermediate-mass main-sequence stars is an important step toward a better understanding of the structure and dynamics in the deep radiative region of the stars. …”
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