Dr. Andreas Alexander Christoph Sander
Astronomisches Rechen-Institut
Phone
Office
Neubau, Room N.E-04
Postal Address
Zentrum für Astronomie der Universität Heidelberg
Astronomisches Rechen-Institut
Mönchhofstr. 12-14
69120 Heidelberg
Astronomisches Rechen-Institut
Mönchhofstr. 12-14
69120 Heidelberg
ORCID
Research interests
Hot Stars,
Massive Stars,
Evolved Stars,
High Mass X-ray Binaries,
Stellar Atmospheres,
Stellar Winds and Feedback,
Spectroscopy,
Gravitational Waves,
PoWR
32.
10/2024
Reyero Serantes, S.; Oskinova, L. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
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 donor
A&A 690, A347(2024)
Reyero Serantes, S.; Oskinova, L. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
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 donor
A&A 690, A347(2024)
31.
10/2024
Shenar, T.; Bodensteiner, J. et al. (inc. Schösser, E. C.; Schneider, F. R. N.; Sander, A. A. C.; Ramachandran, V.; Lefever, R. R.; Josiek, J.; González-Torà, G.; Bronner, V. A.; Bernini-Peron, M.)
Binarity at LOw Metallicity (BLOeM): A spectroscopic VLT monitoring survey of massive stars in the SMC
A&A 690, A289(2024)
Shenar, T.; Bodensteiner, J. et al. (inc. Schösser, E. C.; Schneider, F. R. N.; Sander, A. A. C.; Ramachandran, V.; Lefever, R. R.; Josiek, J.; González-Torà, G.; Bronner, V. A.; Bernini-Peron, M.)
Binarity at LOw Metallicity (BLOeM): A spectroscopic VLT monitoring survey of massive stars in the SMC
A&A 690, A289(2024)
30.
10/2024
Méndez-Delgado, J. E.; Kreckel, K. et al. (inc. Sander, A. A. C.)
Gas-phase Fe/O and Fe/N abundances in star-forming regions: Relations between nucleosynthesis, metallicity, and dust
A&A 690, A248(2024)
Méndez-Delgado, J. E.; Kreckel, K. et al. (inc. Sander, A. A. C.)
Gas-phase Fe/O and Fe/N abundances in star-forming regions: Relations between nucleosynthesis, metallicity, and dust
A&A 690, A248(2024)
29.
10/2024
Telford, O. Grace; Chisholm, John et al. (inc. Ramachandran, Varsha; Sander, Andreas A. C.)
Observations of Extremely Metal-poor O Stars: Weak Winds and Constraints for Evolution Models
ApJ 974, 85(2024)
Telford, O. Grace; Chisholm, John et al. (inc. Ramachandran, Varsha; Sander, Andreas A. C.)
Observations of Extremely Metal-poor O Stars: Weak Winds and Constraints for Evolution Models
ApJ 974, 85(2024)
28.
9/2024
Martins, F.; Bouret, J. -C. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
X-Shooting ULLYSES: Massive stars at low metallicity: V. Effect of metallicity on surface abundances of O stars
A&A 689, A31(2024)
Martins, F.; Bouret, J. -C. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
X-Shooting ULLYSES: Massive stars at low metallicity: V. Effect of metallicity on surface abundances of O stars
A&A 689, A31(2024)
27.
9/2024
Sander, A. A. C.; Bouret, J. -C. et al. (inc. Schösser, E. C.; Lefever, R. R.; Larkin, C. J. K.; Ramachandran, V.; Bernini-Peron, M.)
X-Shooting ULLYSES: Massive stars at low metallicity: IV. Spectral analysis methods and exemplary results for O stars
A&A 689, A30(2024)
Sander, A. A. C.; Bouret, J. -C. et al. (inc. Schösser, E. C.; Lefever, R. R.; Larkin, C. J. K.; Ramachandran, V.; Bernini-Peron, M.)
X-Shooting ULLYSES: Massive stars at low metallicity: IV. Spectral analysis methods and exemplary results for O stars
A&A 689, A30(2024)
26.
9/2024
Higgins, Erin R.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
New Wolf-Rayet wind yields and nucleosynthesis of Helium stars
MNRAS 533, 1095(2024)
Higgins, Erin R.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
New Wolf-Rayet wind yields and nucleosynthesis of Helium stars
MNRAS 533, 1095(2024)
25.
8/2024
Hawcroft, C.; Sana, H. et al. (inc. Sander, A. A. C.; Lefever, R.)
X-Shooting ULLYSES: Massive stars at low metallicity. III. Terminal wind speeds of ULLYSES massive stars
A&A 688, A105(2024)
Hawcroft, C.; Sana, H. et al. (inc. Sander, A. A. C.; Lefever, R.)
X-Shooting ULLYSES: Massive stars at low metallicity. III. Terminal wind speeds of ULLYSES massive stars
A&A 688, A105(2024)
24.
8/2024
Sana, H.; Tramper, F. et al. (inc. Sander, A. A. C.; Ramachandran, V.; Larkin, C. J. K.)
X-Shooting ULLYSES: Massive stars at low metallicity. II. DR1: Advanced optical data products for the Magellanic Clouds
A&A 688, A104(2024)
Sana, H.; Tramper, F. et al. (inc. Sander, A. A. C.; Ramachandran, V.; Larkin, C. J. K.)
X-Shooting ULLYSES: Massive stars at low metallicity. II. DR1: Advanced optical data products for the Magellanic Clouds
A&A 688, A104(2024)
23.
8/2024
Josiek, J.; Ekström, S.; Sander, A. A. C.
Impact of main sequence mass loss on the appearance, structure, and evolution of Wolf-Rayet stars
A&A 688, A71(2024)
Josiek, J.; Ekström, S.; Sander, A. A. C.
Impact of main sequence mass loss on the appearance, structure, and evolution of Wolf-Rayet stars
A&A 688, A71(2024)
22.
8/2024
Vieu, T.; Larkin, C. J. K. et al. (inc. Ramachandran, V.; Sander, A. A. C.)
Hydrodynamic simulation of Cygnus OB2: the absence of a cluster wind termination shock
MNRAS 532, 2174(2024)
Vieu, T.; Larkin, C. J. K. et al. (inc. Ramachandran, V.; Sander, A. A. C.)
Hydrodynamic simulation of Cygnus OB2: the absence of a cluster wind termination shock
MNRAS 532, 2174(2024)
21.
6/2024
Toalá, Jesús A.; Todt, Helge; Sander, Andreas A. C.
Peering into the Wolf-Rayet phenomenon through [WO] and [WC] stars
MNRAS 531, 2422(2024)
Toalá, Jesús A.; Todt, Helge; Sander, Andreas A. C.
Peering into the Wolf-Rayet phenomenon through [WO] and [WC] stars
MNRAS 531, 2422(2024)
20.
4/2024
Gómez-González, V. M. A.; Mayya, Y. D. et al. (inc. Sander, A. A. C.)
Chemical abundances and ionizing mechanisms in the star-forming double-ring of AM 0644-741 using MUSE data
MNRAS 529, 4369(2024)
Gómez-González, V. M. A.; Mayya, Y. D. et al. (inc. Sander, A. A. C.)
Chemical abundances and ionizing mechanisms in the star-forming double-ring of AM 0644-741 using MUSE data
MNRAS 529, 4369(2024)
19.
3/2024
Clark, Ilyse; Berg, Danielle A. et al. (inc. Sander, Andreas A. C.)
Aperture and Resolution Effects on Ultraviolet Star-forming Properties: Insights from Local Galaxies and Implications for High-redshift Observations
ApJ 964, 25(2024)
Clark, Ilyse; Berg, Danielle A. et al. (inc. Sander, Andreas A. C.)
Aperture and Resolution Effects on Ultraviolet Star-forming Properties: Insights from Local Galaxies and Implications for High-redshift Observations
ApJ 964, 25(2024)
18.
2/2024
Parsons, Timothy N.; Prinja, Raman K. et al. (inc. Sander, Andreas A. C.; Bernini-Peron, Matheus)
Optically thick structure in early B-type supergiant stellar winds at low metallicities
MNRAS 527, 11422(2024)
Parsons, Timothy N.; Prinja, Raman K. et al. (inc. Sander, Andreas A. C.; Bernini-Peron, Matheus)
Optically thick structure in early B-type supergiant stellar winds at low metallicities
MNRAS 527, 11422(2024)
17.
2/2024
Sacchi, A.; Esposito, P. et al. (inc. Arca Sedda, M.; Sander, A. A. C.)
A soft and transient ultraluminous X-ray source with six-hour modulation in the NGC 300 galaxy
A&A 682, A151(2024)
Sacchi, A.; Esposito, P. et al. (inc. Arca Sedda, M.; Sander, A. A. C.)
A soft and transient ultraluminous X-ray source with six-hour modulation in the NGC 300 galaxy
A&A 682, A151(2024)
16.
2/2024
Parsons, Timothy N.; Prinja, Raman K. et al. (inc. Sander, Andreas A. C.; Bernini-Peron, Matheus)
Optically thick structure in early B-type supergiant stellar winds at low metallicities
MNRAS 527, 1142(2024)
Parsons, Timothy N.; Prinja, Raman K. et al. (inc. Sander, Andreas A. C.; Bernini-Peron, Matheus)
Optically thick structure in early B-type supergiant stellar winds at low metallicities
MNRAS 527, 1142(2024)
15.
11/2023
Shenar, T.; Sana, H. et al. (inc. Sander, A. A. C.)
Constraints on the multiplicity of the most massive stars known: R136 a1, a2, a3, and c
A&A 679, A36(2023)
Shenar, T.; Sana, H. et al. (inc. Sander, A. A. C.)
Constraints on the multiplicity of the most massive stars known: R136 a1, a2, a3, and c
A&A 679, A36(2023)
14.
9/2023
Bernini-Peron, M.; Marcolino, W. L. F. et al. (inc. Schneider, F. R. N.; Ramachandran, V.; Sander, A. A. C.)
Clumping and X-rays in cooler B supergiant stars
A&A 677, A50(2023)
Bernini-Peron, M.; Marcolino, W. L. F. et al. (inc. Schneider, F. R. N.; Ramachandran, V.; Sander, A. A. C.)
Clumping and X-rays in cooler B supergiant stars
A&A 677, A50(2023)
13.
9/2023
Sabhahit, Gautham N.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
Very massive stars and pair-instability supernovae: mass-loss framework for low metallicity
MNRAS 524, 1529(2023)
Sabhahit, Gautham N.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
Very massive stars and pair-instability supernovae: mass-loss framework for low metallicity
MNRAS 524, 1529(2023)
12.
7/2023
Vink, Jorick S.; Mehner, A. et al. (inc. Ramachandran, V.; Lefever, R. R.; Larkin, C. J. K.; Bernini-Peron, M.; Sander, A. A. C.)
X-Shooting ULLYSES: Massive stars at low metallicity. I. Project description
A&A 675, A154(2023)
Vink, Jorick S.; Mehner, A. et al. (inc. Ramachandran, V.; Lefever, R. R.; Larkin, C. J. K.; Bernini-Peron, M.; Sander, A. A. C.)
X-Shooting ULLYSES: Massive stars at low metallicity. I. Project description
A&A 675, A154(2023)
11.
7/2023
Lau, Ryan M.; Wang, Jason et al. (inc. Sander, Andreas A. C.)
From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-wind Binary Wolf-Rayet 140
ApJ 951, 89(2023)
Lau, Ryan M.; Wang, Jason et al. (inc. Sander, Andreas A. C.)
From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-wind Binary Wolf-Rayet 140
ApJ 951, 89(2023)
10.
6/2023
Ramachandran, V.; Klencki, J. et al. (inc. Sander, A. A. C.)
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
A&A 674, L12(2023)
Ramachandran, V.; Klencki, J. et al. (inc. Sander, A. A. C.)
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
A&A 674, L12(2023)
9.
5/2023
Pauli, D.; Oskinova, L. M. et al. (inc. Ramachandran, V.; Sander, A. A. C.)
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
A&A 673, A40(2023)
Pauli, D.; Oskinova, L. M. et al. (inc. Ramachandran, V.; Sander, A. A. C.)
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
A&A 673, A40(2023)
8.
5/2023
Lefever, R. R.; Sander, A. A. C. et al.
Exploring the influence of different velocity fields on Wolf-Rayet star spectra
MNRAS 521, 1374(2023)
Lefever, R. R.; Sander, A. A. C. et al.
Exploring the influence of different velocity fields on Wolf-Rayet star spectra
MNRAS 521, 1374(2023)
7.
3/2023
Sixtos, A.; Wofford, A. et al. (inc. Sander, A. A. C.)
Looking for nebular He II emission south of the multiple-massive star system, HD 5980
MNRAS 519, 5656(2023)
Sixtos, A.; Wofford, A. et al. (inc. Sander, A. A. C.)
Looking for nebular He II emission south of the multiple-massive star system, HD 5980
MNRAS 519, 5656(2023)
6.
2/2023
Sander, A. A. C.; Lefever, R. R. et al. (inc. Ramachandran, V.; Poniatowski, L. G.)
The temperature dependency of Wolf-Rayet-type mass loss. An exploratory study for winds launched by the hot iron bump
A&A 670, A83(2023)
Sander, A. A. C.; Lefever, R. R. et al. (inc. Ramachandran, V.; Poniatowski, L. G.)
The temperature dependency of Wolf-Rayet-type mass loss. An exploratory study for winds launched by the hot iron bump
A&A 670, A83(2023)
5.
11/2022
Ramachandran, V.; Oskinova, L. M. et al. (inc. Sander, A. A. C.)
Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution
A&A 667, A77(2022)
Ramachandran, V.; Oskinova, L. M. et al. (inc. Sander, A. A. C.)
Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution
A&A 667, A77(2022)
4.
11/2022
Higgins, Erin R.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
The hydrogen clock to infer the upper stellar mass
MNRAS 516, 4052(2022)
Higgins, Erin R.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
The hydrogen clock to infer the upper stellar mass
MNRAS 516, 4052(2022)
3.
10/2022
Rickard, M. J.; Hainich, R. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC 346 in the SMC galaxy
A&A 666, A189(2022)
Rickard, M. J.; Hainich, R. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC 346 in the SMC galaxy
A&A 666, A189(2022)
2.
8/2022
Sabhahit, Gautham N.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
Mass-loss implementation and temperature evolution of very massive stars
MNRAS 514, 3736(2022)
Sabhahit, Gautham N.; Vink, Jorick S. et al. (inc. Sander, Andreas A. C.)
Mass-loss implementation and temperature evolution of very massive stars
MNRAS 514, 3736(2022)
1.
3/2022
Pauli, D.; Oskinova, L. M. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
The earliest O-type eclipsing binary in the Small Magellanic Cloud, AzV 476: A comprehensive analysis reveals surprisingly low stellar masses
A&A 659, A9(2022)
Pauli, D.; Oskinova, L. M. et al. (inc. Sander, A. A. C.; Ramachandran, V.)
The earliest O-type eclipsing binary in the Small Magellanic Cloud, AzV 476: A comprehensive analysis reveals surprisingly low stellar masses
A&A 659, A9(2022)
