VR
V. Ramachandran
astro-ph.SRastro-ph.GAastro-ph.HEastro-ph.IMastro-ph.COFeedback, SensoryPain ManagementallocentricAmputation, Surgicalautism
On Valency
published · living versionsW_64q97rmd·v1 · currentpublished
A high fraction of close massive binary stars at low metallicity
with H. Sana, T. Shenar, J. Bodensteiner, N. Britavskiy +72
1 version
Preprints & journals
75 papers in the corpus · 1979–2026The Treasury of Extremely Metal-Poor O Stars2609.20928v1 · O. Grace Telford, Christiana Erba, Kristen B. W. McQuinn et al.2026 · 0 citationsarXiv
Potsdam Wolf-Rayet stellar atmosphere grids of OB-type stars: I. Spectroscopic temperature diagnostics across metallicity2608.25003v1 · D. Pauli, H. Todt, W.-R. Hamann et al.2026 · 0 citationsarXiv
Multiplicity of Massive Stars at Low Metallicity: Early Results from the BLOeM Campaign2607.27395v1 · T. Shenar, J. Bodensteiner, M. Abdul-Masih et al.2026 · 0 citationsThe Messenger (ESO), Vol. 196, pp. 15-19 (2026)
Ultraviolet spectroscopy reveals a hot and luminous companion to the Be star+black hole candidate MWC 6562601.14403v2 · Johanna Muller-Horn, Varsha Ramachandran, Kareem El-Badry et al.2026 · 2 citationsarXiv
The winds of OBA hypergiants and luminous blue variables: Dynamically-consistent atmosphere models reveal multiple wind regimes2601.03072v2 · Matheus Bernini-Peron, Andreas A. C. Sander, Gautham N. Sabhahit et al.2026 · 0 citationsarXiv
Dynamically consistent analysis of Galactic WN4b stars2601.02498v2 · Roel R. Lefever, Andreas A.C. Sander, Matheus Bernini-Peron et al.2026 · 2 citationsarXiv
Characterizing the Low-Mass Pre-Main-Sequence Population in the Low-Metallicity Star-Forming Region Dolidze 25 Using VLT-MUSE2512.04645v1 · Mizna Ashraf, Jessy Jose, Gregory J. Herczeg et al.2025 · 2 citationsarXiv
Can Wolf-Rayet stars be the missing ingredient to explain high-z He II ionizing radiation?2511.16323v1 · G. Gonz'alez-Tora, A. A. C. Sander, E. Egorova et al.2025 · 1 citationarXiv
Hidden massive eclipsing binaries in red supergiant systems: The hierarchical triple system KQ Puppis and other candidates2509.25168v5 · D. Jadlovsk'y, L. Moln'ar, A. Ercolino et al.2025 · 1 citationarXiv
A high fraction of close massive binary stars at low metallicity2509.12488v1 · H. Sana, T. Shenar, J. Bodensteiner et al.2025 · 26 citationsNature Astronomy (2025)on Valency
SDSS-V LVM: Detectability of Wolf-Rayet stars and their He II ionizing flux in low-metallicity environments I. The weak-lined, early-type WN3 stars in the SMC2509.04569v2 · G. Gonz'alez-Tora, A. A. C. Sander, E. Egorova et al.2025 · 3 citationsA&A 703, L11 (2025)
Discovery of a new transitional type of evolved massive stars with hard ionizing flux2508.18410v1 · Andreas A.C. Sander, Roel R. Lefever, Joris Josiek et al.2025 · 0 citationsarXiv
Minimum and maximum mass-luminosity relations for stripped stars2508.14161v1 · Gautham N. Sabhahit, Jorick S. Vink, Andreas A. C. Sander et al.2025 · 1 citationarXiv
Metal-poor single Wolf-Rayet stars: The interplay of optically thick winds and rotation2507.00137v3 · Lumen Boco, Michela Mapelli, Andreas A. C. Sander et al.2025 · 8 citationsA&A 703, A243 (2025)
First JWST/NIRSpec Spectroscopy of O Stars in the Small Magellanic Cloud2505.10721v1 · Armin Mang Rom'an, Peter Zeidler, Wolf-Rainer Hamann et al.2025 · 1 citation2025ApJ...984L..49M
Exploring the connection between atmosphere models and evolution models of very massive stars2504.08880v1 · Joris Josiek, Andreas A. C. Sander, Matheus Bernini-Peron et al.2025 · 9 citationsA&A 697, A193 (2025)
New empirical mass-loss recipe for UV radiation line-driven winds of hot stars across various metallicities2504.07073v1 · D. Pauli, L. M. Oskinova, W.-R. Hamann et al.2025 · 5 citationsarXiv
Comprehensive UV and Optical spectral analysis of Cygnus X-1: Stellar and wind parameters, abundances, and evolutionary implications2504.05885v2 · V. Ramachandran, A.A.C. Sander, L. M. Oskinova et al.2025 · 16 citationsA&A 698, A37 (2025)
Coupling hydrodynamics with comoving frame radiative transfer. III. The wind regime of early-type B hypergiants2504.03537v1 · M. Bernini-Peron, A.A.C. Sander, F. Najarro et al.2025 · 0 citationsarXiv
Binarity at LOw Metallicity (BLOeM): Enhanced multiplicity of early B-type dwarfs and giants at 2503.21936v4 · J. I. Villasenor, H. Sana, L. Mahy et al.2025 · 14 citationsA&A 698, A41 (2025)
X-Shooting ULLYSES: massive stars at low metallicity: XII. The clumped winds of O-type (super)giants in the Large Magellanic Cloud2503.14687v1 · Sarah A. Brands, Frank Backs, Alex de Koter et al.2025 · 8 citationsA&A 697, A54 (2025)
Extremely iron-poor O-type stars in the Magellanic Bridge2503.10769v1 · E.C. Schosser, V. Ramachandran, A.A.C. Sander et al.2025 · 5 citationsA&A 696, L3 (2025)
Binarity at LOw Metallicity (BLOeM): Multiplicity of early B-type supergiants in the Small Magellanic Cloud2502.12239v2 · N. Britavskiy, L. Mahy, D. J. Lennon et al.2025 · 2 citationsA&A 698, A40 (2025)
Binarity at Low Metallicity (BLOeM) -- Multiplicity properties of Oe and Be stars2502.02641v1 · J. Bodensteiner, T. Shenar, H. Sana et al.2025 · 2 citationsA&A 698, A38 (2025)
Determining stellar properties of massive stars in NGC346 in the SMC with a Bayesian statistic technique2412.07373v1 · M. J. Rickard, R. Hainich, D. Pauli et al.2024 · 1 citationM. Rickard et al. (2024) A149
X-Shooting ULLYSES: Massive Stars at Low Metallicity X. Physical Parameters and Feedback of Massive Stars in the LMC N11 B Star-Forming Region2411.14149v1 · V.M.A. G'omez-Gonz'alez, L.M. Oskinova, W.-R. Hamann et al.2024 · 5 citationsA&A 695, A197 (2025)
X-Shooting ULLYSES: Massive stars at low metallicity VI. Atmosphere and mass-loss properties of O-type giants in the Small Magellanic Cloud2411.06884v1 · Frank Backs, S. A. Brands, A. de Koter et al.2024 · 0 citationsarXiv
Multi-wavelength spectroscopic analysis of the ULX Holmberg II X-1 and its nebula suggests the presence of a heavy black hole accreting from a B-type donor2409.12133v2 · S. Reyero Serantes, L. Oskinova, W.-R. Hamann et al.2024 · 4 citationsarXiv
Observations of Extremely Metal-Poor O Stars: Weak Winds and Constraints for Evolution Models2407.20313v1 · O. Grace Telford, John Chisholm, Andreas A. C. Sander et al.2024 · 20 citationsarXiv
X-Shooting ULLYSES: Massive stars at low metallicity VII. Stellar and wind properties of B supergiants in the Small Magellanic Cloud2407.14216v1 · M. Bernini-Peron, A.A.C. Sander, V. Ramachandran et al.2024 · 0 citationsarXiv
X-Shooting ULLYSES: Massive stars at low metallicity. IV. Spectral analysis methods and exemplary results for O stars2407.03137v2 · A.A.C. Sander, J.-C. Bouret, M. Bernini-Peron et al.2024 · 18 citationsA&A 689, A30 (2024)
X-Shooting ULLYSES: Massive Stars at low metallicity VIII. Stellar and wind parameters of newly revealed stripped stars in Be binaries2406.17678v1 · V. Ramachandran, A.A.C. Sander, D. Pauli et al.2024 · 23 citationsA&A 692, A90 (2024)
Hydrodynamic simulation of Cygnus OB2: the absence of a cluster wind termination shock2406.13589v1 · Thibault Vieu, Cormac J. K. Larkin, Lucia Harer et al.2024 · 18 citationsarXiv
X-Shooting ULLYSES: Massive stars at low metallicity -- V. Effect of metallicity on surface abundances of O stars2405.01267v1 · F. Martins, J.-C. Bouret, D.J. Hillier et al.2024 · 0 citationsarXiv
X-Shooting ULLYSES: Massive Stars at low metallicity II. DR1: Advanced optical data products for the Magellanic Clouds2402.16987v1 · H. Sana, F. Tramper, M. Abdul-Masih et al.2024 · 22 citationsA&A 688, A104 (2024)
Clumping and X-Rays in cooler B supergiant stars2307.05421v2 · Matheus Bernini-Peron, Wagner L.F. Marcolino, Andreas A.C. Sander et al.2023 · 26 citationsA&A 677, A50 (2023)
A partially stripped massive star in a Be binary at low metallicity: A missing link towards Be X-ray binaries and double neutron star mergers2305.14262v2 · V. Ramachandran, J. Klencki, A. A. C. Sander et al.2023 · 30 citationsA&A 674, L12 (2023)
X-Shooting ULLYSES: massive stars at low metallicity. I. Project Description2305.06376v3 · Jorick S. Vink, A. Mehner, P.A. Crowther et al.2023 · 63 citationsA&A 675, A154 (2023)
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity2303.03989v1 · D. Pauli, L. M. Oskinova, W.-R. Hamann et al.2023 · 15 citationsA&A 673, A40 (2023)
Bringing Stellar Evolution & Feedback Together: Summary of proposals from the Lorentz Center Workshop, 20222301.13611v1 · Sam Geen, Poojan Agrawal, Paul A. Crowther et al.2023 · 10 citationsarXiv
The temperature dependency of Wolf-Rayet-type mass loss: An exploratory study for winds launched by the hot iron bump2301.01785v1 · A. A. C. Sander, R. R. Lefever, L. G. Poniatowski et al.2023 · 47 citationsA&A 670, A83 (2023)
Winds of OB stars: impact of metallicity, rotation and binary interaction2211.12153v1 · Varsha Ramachandran2022 · 1 citationarXiv
Massive star feedback in the Magellanic Clouds and the tidal Bridge2302.10299v1 · Varsha Ramachandran2022 · 0 citationsarXiv
Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution2208.07773v1 · V. Ramachandran, L. M. Oskinova, W.-R. Hamann et al.2022 · 23 citationsA&A 667, A77 (2022)
Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC346 in the SMC galaxy2207.09333v1 · M. J. Rickard, R. Hainich, W.-R. Hamann et al.2022 · 36 citationsA&A 666, A189 (2022)
Ionization and Star Formation in the Giant HII Region SMC-N662205.05147v1 · E. Geist, J. S. Gallagher, R. Kotulla et al.2022 · 6 citationsarXiv
The earliest O-type eclipsing binary in the Small Magellanic Cloud, AzV 476: A comprehensive analysis reveals surprisingly low stellar masses2201.09148v1 · D. Pauli, L. M. Oskinova, W.-R. Hamann et al.2022 · 25 citationsA&A 659, A9 (2022)
The excess of cool supergiants from contemporary stellar evolution models defies the metallicity-independent Humphreys-Davidson limit2102.03102v1 · Avishai Gilkis, Tomer Shenar, Varsha Ramachandran et al.2021 · 43 citationsarXiv
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 ecology2011.08006v1 · Varsha Ramachandran, L. M. Oskinova, W.-R. Hamann2020 · 21 citationsA&A 646, A16 (2021)
Testing massive star evolution, star-formation history, and feedback at low metallicity: Photometric analysis of OB stars in the SMC Wing1912.08953v2 · Leah M. Fulmer, John S. Gallagher III, Wolf-Rainer Hamann et al.2019 · 5 citationsA&A 633, A164 (2020)
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