Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Ramachandran, Varsha"'
Autor:
Telford, O. Grace, Chisholm, John, Sander, Andreas A. C., Ramachandran, Varsha, McQuinn, Kristen B. W., Berg, Danielle A.
Metal-poor massive stars drive the evolution of low-mass galaxies, both locally and at high redshift. However, quantifying the feedback they impart to their local surroundings remains uncertain because models of stellar evolution, mass loss, and ioni
Externí odkaz:
http://arxiv.org/abs/2407.20313
Autor:
Vieu, Thibault, Larkin, Cormac J. K., Härer, Lucia, Reville, Brian, Sander, Andreas A. C., Ramachandran, Varsha
We perform a large-scale hydrodynamic simulation of a massive star cluster whose stellar population mimics that of the Cygnus OB2 association. The main-sequence stars are first simulated during 1.6 Myr, until a quasi-stationary state is reached. At t
Externí odkaz:
http://arxiv.org/abs/2406.13589
Autor:
Bernini-Peron, Matheus, Marcolino, Wagner L. F., Sander, Andreas A. C., Bouret, Jean-Claude, Ramachandran, Varsha, Saling, Julian, Schneider, Fabian R. N., Oskinova, Lidia M., Najarro, Francisco
Publikováno v:
A&A 677, A50 (2023)
B supergiants (BSGs) are evolved stars with effective temperatures between 10 to 30 kK and are important to understand massive star evolution. Located on the edge of the line-driven wind regime, the study of their atmospheres is helpful to understand
Externí odkaz:
http://arxiv.org/abs/2307.05421
Autor:
Geen, Sam, Agrawal, Poojan, Crowther, Paul A., Keller, B. W., de Koter, Alex, Keszthelyi, Zsolt, van de Voort, Freeke, Ali, Ahmad A., Backs, Frank, Bonne, Lars, Brugaletta, Vittoria, Derkink, Annelotte, Ekström, Sylvia, Fichtner, Yvonne A., Grassitelli, Luca, Götberg, Ylva, Higgins, Erin R., Laplace, Eva, Liow, Kong You, Lorenzo, Marta, McLeod, Anna F., Meynet, Georges, Newsome, Megan, Oliva, G. André, Ramachandran, Varsha, Rey, Martin P., Rieder, Steven, Romano-Díaz, Emilio, Sabhahit, Gautham, Sander, Andreas A. C., Sarwar, Rafia, Stinshoff, Hanno, Stoop, Mitchel, Szécsi, Dorottya, Trebitsch, Maxime, Vink, Jorick S., Winch, Ethan
Stars strongly impact their environment, and shape structures on all scales throughout the universe, in a process known as ``feedback''. Due to the complexity of both stellar evolution and the physics of larger astrophysical structures, there remain
Externí odkaz:
http://arxiv.org/abs/2301.13611
Autor:
Ramachandran, Varsha
Winds of massive stars are an important ingredient in determining their evolution, final remnant mass, and feedback to the surrounding interstellar medium. We compare empirical results for OB star winds at low metallicity with theoretical predictions
Externí odkaz:
http://arxiv.org/abs/2211.12153
Autor:
Ramachandran, Varsha
Massive stars have far-reaching feedback effects that alter the surrounding environment on local, global, and cosmic scales. Spectral analyses of massive stars with adequate stellar-atmosphere models are important to study massive star feedback in de
Externí odkaz:
http://arxiv.org/abs/2302.10299
Autor:
Gilkis, Avishai, Shenar, Tomer, Ramachandran, Varsha, Jermyn, Adam S., Mahy, Laurent, Oskinova, Lidia M., Arcavi, Iair, Sana, Hugues
The Humphreys-Davidson (HD) limit empirically defines a region of high luminosities (log L > 5.5) and low effective temperatures (T < 20kK) on the Hertzsprung-Russell Diagram in which hardly any supergiant stars are observed. Attempts to explain this
Externí odkaz:
http://arxiv.org/abs/2102.03102
Publikováno v:
A&A 646, A16 (2021)
The Magellanic Bridge stretching between the SMC and LMC is the nearest tidally stripped intergalactic environment and has a low average metallicity of $Z~0.1Z_{\odot}$. Here we report the first discovery of three O-type stars in the Bridge using arc
Externí odkaz:
http://arxiv.org/abs/2011.08006
Autor:
Liu, Jifeng, Zheng, Zheng, Soria, Roberto, Aceituno, Jesus, Zhang, Haotong, Lu, Youjun, Wang, Song, Hamann, Wolf-Rainer, Oskinova, Lida M., Ramachandran, Varsha, Yuan, Hailong, Bai, Zhongrui, Wang, Shu, McKee, Brendan J., Wu, Jianfeng, Wang, Junfeng, Lattanzi, Mario, Belczynski, Krzysztof, Casares, Jorge, Simon-Diaz, Sergio, Hernández, Jonay I. González, Rebolo, Rafael
The mass, origin and evolutionary stage of the binary system LB-1 has been the subject of intense debate, following the claim that it hosts an $\sim$70$M_{\odot}$ black hole, in stark contrast with the expectations for stellar remnants in the Milky W
Externí odkaz:
http://arxiv.org/abs/2005.12595
Autor:
Fulmer, Leah M., Gallagher III, John S., Hamann, Wolf-Rainer, Oskinova, Lida M., Ramachandran, Varsha
Publikováno v:
A&A 633, A164 (2020)
The supergiant ionized shell SMC-SGS 1 (DEM 167), located in the outer Wing of the Small Magellanic Cloud (SMC), resembles structures that originate from an energetic star-formation event and later stimulate star formation as they expand into the amb
Externí odkaz:
http://arxiv.org/abs/1912.08953