Publications
> Clumping and X-Rays in cooler B supergiant stars
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
July 2023
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> X-Shooting ULLYSES: Massive stars at low metallicity. I. Project description
Vink, Jorick S.; Mehner, A.; Crowther, P. A.; Fullerton, A.; Garcia, M.; Martins, F.; Morrell, N.; Oskinova, L. M.; St-Louis, N.; ud-Doula, A.; Sander, A. A. C.; Sana, H.; Bouret, J. -C.; Kubátová, B.; Marchant, P.; Martins, L. P.; Wofford, A.; van Loon, J. Th.; Grace Telford, O.; Götberg, Y.; Bowman, D. M.; Erba, C.; Kalari, V. M.; Abdul-Masih, M.; Alkousa, T.; Backs, F.; Barbosa, C. L.; Berlanas, S. R.; Bernini-Peron, M.; Bestenlehner, J. M.; Blomme, R.; Bodensteiner, J.; Brands, S. A.; Evans, C. J.; David-Uraz, A.; Driessen, F. A.; Dsilva, K.; Geen, S.; Gómez-González, V. M. A.; Grassitelli, L.; Hamann, W. -R.; Hawcroft, C.; Herrero, A.; Higgins, E. R.; John Hillier, D.; Ignace, R.; Istrate, A. G.; Kaper, L.; Kee, N. D.; Kehrig, C.; Keszthelyi, Z.; Klencki, J.; de Koter, A.; Kuiper, R.; Laplace, E.; Larkin, C. J. K.; Lefever, R. R.; Leitherer, C.; Lennon, D. J.; Mahy, L.; Maíz Apellániz, J.; Maravelias, G.; Marcolino, W.; McLeod, A. F.; de Mink, S. E.; Najarro, F.; Oey, M. S.; Parsons, T. N.; Pauli, D.; Pedersen, M. G.; Prinja, R. K.; Ramachandran, V.; Ramírez-Tannus, M. C.; Sabhahit, G. N.; Schootemeijer, A.; Reyero Serantes, S.; Shenar, T.; Stringfellow, G. S.; Sudnik, N.; Tramper, F.; Wang, L.
July 2023
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> A partially stripped massive star in a Be binary at low metallicity. A missing link towards Be X-ray binaries and double neutron star mergers
Ramachandran, V.; Klencki, J.; Sander, A. A. C.; Pauli, D.; Shenar, T.; Oskinova, L. M.; Hamann, W. -R.
June 2023
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> Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
Pauli, D.; Oskinova, L. M.; Hamann, W. -R.; Bowman, D. M.; Todt, H.; Shenar, T.; Sander, A. A. C.; Erba, C.; Gómez-González, V. M. A.; Kehrig, C.; Klencki, J.; Kuiper, R.; Mehner, A.; de Mink, S. E.; Oey, M. S.; Ramachandran, V.; Schootemeijer, A.; Reyero Serantes, S.; Wofford, A.
May 2023
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> Bringing Stellar Evolution and Feedback Together: Summary of Proposals from the Lorentz Center Workshop
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; You Liow, Kong; Lorenzo, Marta; McLeod, Anna F.; Meynet, Georges; Newsome, Megan; André Oliva, G.; 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
February 2023
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> The temperature dependency of Wolf-Rayet-type mass loss. An exploratory study for winds launched by the hot iron bump
Sander, A. A. C.; Lefever, R. R.; Poniatowski, L. G.; Ramachandran, V.; Sabhahit, G. N.; Vink, J. S.
February 2023
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> Massive star feedback in the Magellanic Clouds and the tidal Bridge
Ramachandran, Varsha
November 2022
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> Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution
Ramachandran, V.; Oskinova, L. M.; Hamann, W. -R.; Sander, A. A. C.; Todt, H.; Pauli, D.; Shenar, T.; Torrejón, J. M.; Postnov, K. A.; Blondin, J. M.; Bozzo, E.; Hainich, R.; Massa, D.
November 2022
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> Winds of OB stars: impact of metallicity, rotation and binary interaction
Ramachandran, Varsha
November 2022
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> Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC 346 in the SMC galaxy
Rickard, M. J.; Hainich, R.; Hamann, W. -R.; Oskinova, L. M.; Prinja, R. K.; Ramachandran, V.; Pauli, D.; Todt, H.; Sander, A. A. C.; Shenar, T.; Chu, Y. -H.; Gallagher, J. S.
October 2022
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> Ionization and Star Formation in the Giant H II Region SMC-N66
Geist, E.; Gallagher, J. S.; Kotulla, R.; Oskinova, L.; Hamann, W. -R.; Ramachandran, V.; Sabbi, E.; Smith, L.; Kniazev, A.; Nota, A.; Rickard, M. J.
June 2022
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> Repeated Stellar Wind Line Variability in O Stars in the SMC
Rickard, Matthew J.; Pauli, Daniel; Hainich, Rainer; Hamann, Wolf-Rainer; Massa, Derck L.; Oskinova, Lidia; Parsons, Timothy N.; Prinja, Raman K.; Ramachandran, Varsha
June 2022
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> Smoking guns in massive binary evolution: The hunt for Black Holes and Stripped Stars
Ramachandran, Varsha; Sander, Andreas; Bernini Peron, Matheus; Lefever, Roel; Oskinova, Lidia; Pauli, Daniel; Todt, Helge
June 2022
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> The earliest O-type eclipsing binary in the Small Magellanic Cloud, AzV 476: A comprehensive analysis reveals surprisingly low stellar masses
Pauli, D.; Oskinova, L. M.; Hamann, W. -R.; Ramachandran, V.; Todt, H.; Sander, A. A. C.; Shenar, T.; Rickard, M.; Maíz Apellániz, J.; Prinja, R.
March 2022
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> VizieR Online Data Catalog: CARMENES obs. of the binary system LB-1 (Liu+, 2020)
Liu, J.; Zheng, Z.; Soria, R.; Aceituno, J.; Zhang, H.; Lu, Y.; Wang, S.; Hamann, W. -R.; Oskinova, L. M.; Ramachandran, V.; Yuan, H.; Bai, Z.; Wang, S.; McKee, B. J.; Wu, J.; Wang, J.; Lattanzi, M.; Belczynski, K.; Casares, J.; Gonzalez Hernandez, J. I.; Rebolo, R.
November 2021
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> The HST probes the winds and feedback of metal poor OB stars in the tidally stripped Magellanic Bridge
Ramachandran, Varsha; Gallagher, John S.; Hainich, Rainer; Hamann, Wolf-Rainer; Oskinova, Lidia; Sander, Andreas; Shenar, Tomer; Todt, Helge
June 2021
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> The excess of cool supergiants from contemporary stellar evolution models defies the metallicity-independent Humphreys-Davidson limit
Gilkis, Avishai; Shenar, Tomer; Ramachandran, Varsha; Jermyn, Adam S.; Mahy, Laurent; Oskinova, Lidia M.; Arcavi, Iair; Sana, Hugues
May 2021
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> Discovery of O stars in the tidal Magellanic Bridge. Stellar parameters, abundances, and feedback of the nearest metal-poor massive stars and their implication for the Magellanic System ecology
Ramachandran, V.; Oskinova, L. M.; Hamann, W. -R.
February 2021
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> Phase-dependent Study of Near-infrared Disk Emission Lines in LB-1
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; González Hernández, Jonay I.; Rebolo, Rafael
September 2020
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> The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud. Spectroscopy, orbital analysis, formation, and evolution (Corrigendum)
Shenar, T.; Sablowski, D. P.; Hainich, R.; Todt, H.; Moffat, A. F. J.; Oskinova, L. M.; Ramachandran, V.; Sana, H.; Sander, A. A. C.; Schnurr, O.; St-Louis, N.; Vanbeveren, D.; Götberg, Y.; Hamann, W. -R.
September 2020
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> Catching wind with the HST: novel UV spectroscopy of a bona fide ultraluminous X-ray source
Oskinova, Lida; Bozzo, Enrico; Bulik, Tomasz; Gies, Douglas Russell; Hamann, Wolf-Rainer; Massa, Derck L.; Ramachandran, Varsha; Sander, Andreas; Shenar, Tomer; Torrejon, Jose Miguel
May 2020
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> The multiplicity and properties of the LMC WC stars: the immediate progenitors of black holes and stripped supernovae
Shenar, Tomer; Dsilva, Karan; Gilkis, Avishai; Hainich, Rainer; Hamann, Wolf-Rainer; Janssens, Soetkin; Mahy, Laurent; Marchant Campos, Pablo Ignacio; Oskinova, Lida; Ramachandran, Varsha; Sander, Andreas; Todt, Helge
May 2020
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> Wolf-Rayet stars in the outskirts of M33: unveiling helium-star evolution and feedback at subsolar metallicity
Sander, Andreas; Pritzkuleit, Max; Hainich, Rainer; Hamann, Wolf-Rainer; Higgins, Erin Rose; Ignace, Richard; Oskinova, Lida; Ramachandran, Varsha; Shenar, Tomer; Todt, Helge; Vink, Jorick
May 2020
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> Testing massive star evolution, star-formation history, and feedback at low metallicity. Photometric analysis of OB stars in the SMC Wing
Fulmer, Leah M.; Gallagher, John S.; Hamann, Wolf-Rainer; Oskinova, Lida M.; Ramachandran, Varsha
January 2020
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> The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud. Spectroscopy, orbital analysis, formation, and evolution
Shenar, T.; Sablowski, D. P.; Hainich, R.; Todt, H.; Moffat, A. F. J.; Oskinova, L. M.; Ramachandran, V.; Sana, H.; Sander, A. A. C.; Schnurr, O.; St-Louis, N.; Vanbeveren, D.; Götberg, Y.; Hamann, W. -R.
July 2019
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> The HST follows galactic influencers: a COS UV survey of the most massive O-stars in the SMC
Oskinova, Lida; Hainich, Rainer; Hamann, Wolf-Rainer; Massa, Derck L.; Prinja, Raman K.; Ramachandran, Varsha; Rickard, Matthew J.; Sander, Andreas; Shenar, Tomer; Todt, Helge
June 2019
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> Testing massive star evolution, star formation history, and feedback at low metallicity. Spectroscopic analysis of OB stars in the SMC Wing
Ramachandran, V.; Hamann, W. -R.; Oskinova, L. M.; Gallagher, J. S.; Hainich, R.; Shenar, T.; Sander, A. A. C.; Todt, H.; Fulmer, L.
May 2019
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> The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters
Hamann, W. -R.; Gräfener, G.; Liermann, A.; Hainich, R.; Sander, A. A. C.; Shenar, T.; Ramachandran, V.; Todt, H.; Oskinova, L. M.
May 2019
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> VizieR Online Data Catalog: Of-type stars in N206 in the LMC (Ramachandran+, 2018)
Ramachandran, V.; Hainich, R.; Hamann, W. -R.; Oskinova, L. M.; Shenar, T.; Sander, A. A. C.; Todt, H.; Gallagher, J. S.
April 2019
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> VizieR Online Data Catalog: Stellar parameters of OB stars in SMC wing (Ramachandran+, 2019)
Ramachandran, V.; Hamann, W. -R.; Oskinova, L. M.; Gallagher, J. S.; Hainich, R.; Shenar, T.; Sander, A. A. C.; Todt, H.; Fulmer, L.
April 2019
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