Space and Planetary Science; Astronomy and Astrophysics
Abstract :
[en] Context. The empirical distribution of projected rotational velocities (v sin i) in massive O-type stars is characterised by a dominant slow velocity component and a tail of fast rotators. It has been proposed that binary interaction plays a dominant role in the formation of this tail.
Aims. We perform a complete and homogeneous search for empirical signatures of binarity in a sample of 54 fast-rotating stars with the aim of evaluating this hypothesis. This working sample has been extracted from a larger sample of 415 Galactic O-type stars that covers the full range of v sin i values.
Methods. We used new and archival multi-epoch spectra in order to detect spectroscopic binary systems. We complemented this information with Gaia proper motions and TESS photometric data to aid in the identification of runaway stars and eclipsing binaries, respectively. We also benefitted from additional published information to provide a more complete overview of the empirical properties of our working sample of fast-rotating O-type stars.
Results. The identified fraction of single-lined spectroscopic binary (SB1) systems and apparently single stars among the fast-rotating sample is ∼18% and ∼70%, respectively. The remaining 12% correspond to four secure double-line spectroscopic binaries (SB2) with at least one of the components having a v sin i > 200 km s−1 (∼8%), along with a small sample of 2 stars (∼4%) for which the SB2 classification is doubtful: these could actually be single stars with a remarkable line-profile variability. When comparing these percentages with those corresponding to the slow-rotating sample, we find that our sample of fast rotators is characterised by a slightly larger percentage of SB1 systems (∼18% vs. ∼13%) and a considerably smaller fraction of clearly detected SB2 systems (8% vs. 33%). Overall, there seems to be a clear deficit of spectroscopic binaries (SB1+SB2) among fast-rotating O-type stars (∼26% vs. ∼46%). On the contrary, the fraction of runaway stars is significantly higher in the fast-rotating domain (∼33–50%) than among those stars with v sin i < 200 km s−1. Lastly, almost 65% of the apparently single fast-rotating stars are runaways. As a by-product, we discovered a new over-contact SB2 system (HD 165921) and two fast-rotating SB1 systems (HD 46485 and HD 152200) Also, we propose HD 94024 and HD 12323 (both SB1 systems with a v sin i < 200 km s−1) as candidates for hosting a quiescent stellar-mass black hole.
Conclusions. Our empirical results seem to be in good agreement with the assumption that the tail of fast-rotating O-type stars (with v sin i > 200 km s−1) is mostly populated by post-interaction binary products. In particular, we find that the final statistics of identified spectroscopic binaries and apparent single stars are in good agreement with newly computed predictions obtained with the binary population synthesis code BPASS and earlier estimations obtained in previous studies.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Britavskiy, Mikola ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Simón-Díaz, S.
Holgado, G.
Burssens, S.
Maíz Apellániz, J.
Eldridge, J. J.
Nazé, Yaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Pantaleoni González, M.
Herrero, A.
Language :
English
Title :
The IACOB project. VIII. Searching for empirical signatures of binarity in fast-rotating O-type stars
Barbá, R. H., Gamen, R., Arias, J. I., & Morrell, N. I. 2017, in The Lives and Death-Throes of Massive Stars, eds. J. J. Eldridge, J. C. Bray, L. A. S. McClelland, & L. Xiao, 329, 89
Bhatt, H., Pandey, J. C., Kumar, B., Sagar, R., & Singh, K. P. 2010, New A, 15, 755
Blaauw, A. 1961, Bull. Astron. Inst. Neth., 15, 265
Chini, R., Hoffmeister, V. H., Nasseri, A., Stahl, O., & Zinnecker, H. 2012, MNRAS, 424, 1925
Cohen, D. H., Parts, V. V., Doskoch, G. M., et al. 2021, MNRAS, 503, 715
Conti, P. S., & Ebbets, D. 1977, ApJ, 213, 438
De Becker, M., & Raucq, F. 2013, A&A, 558, A28
de Burgos, A., Simon-Díaz, S., Lennon, D. J., et al. 2020, A&A, 643, A116
De Donder, E., Vanbeveren, D., & van Bever, J. 1997, A&A, 318, 812
de Mink, S. E., Langer, N., & Izzard, R. G. 2011, in Active OB Stars: Structure, Evolution, Mass Loss, and Critical Limits, eds. C. Neiner, G. Wade, G. Meynet, & G. Peters, 272, 531
de Mink, S. E., Langer, N., Izzard, R. G., Sana, H., & de Koter, A. 2013, ApJ, 764, 166
de Mink, S. E., Sana, H., Langer, N., Izzard, R. G., & Schneider, F. R. N. 2014, ApJ, 782, 7
Simón-Díaz, S., & Herrero, A. 2014, A&A, 562, A135
Simón-Díaz, S., Godart, M., Castro, N., et al. 2017, A&A, 597, A22
Simón-Díaz, S., PÉrez Prieto, J. A., Holgado, G., de Burgos, A., & Iacob Team 2020a, in XIV.0 Scientific Meeting (virtual) of the Spanish Astronomical Society, 187
Simón-Díaz, S., Britavskiy, N., Castro, N., Holgado, G., & de Burgos, A. 2020b,. A&A, submitted
Sota, A., Maíz Apellániz, J., Walborn, N. R., et al. 2011, ApJS, 193, 24
Sota, A., Maíz Apellániz, J., Morrell, N. I., et al. 2014, ApJS, 211, 10
Stanway, E. R., & Eldridge, J. J. 2018, MNRAS, 479, 75
Strassmeier, K. G., Granzer, T., Weber, M., et al. 2004, Astron. Nachr., 325, 527
Sukhbold, T., Ertl, T., Woosley, S. E., Brown, J. M., & Janka, H. T. 2016, ApJ, 821, 38
Tauris, T. M., & Takens, R. J. 1998, A&A, 330, 1047
Tauris, T. M., Fender, R. P., van den Heuvel, E. P. J., Johnston, H. M., & Wu, K. 1999, MNRAS, 310, 1165
Telting, J. H., Avila, G., Buchhave, L., et al. 2014, Astron. Nachr., 335, 41
Tetzlaff, N., Neuhäuser, R., Hohle, M. M., & Maciejewski, G. 2010, MNRAS, 402, 2369
Tetzlaff, N., Neuhäuser, R., & Hohle, M. M. 2011, MNRAS, 410, 190
Toalá, J. A., Guerrero, M. A., Santamaría, E., Ramos-Larios, G., & Sabin, L. 2020, MNRAS, 495, 4372
Trigueros Páez, E., Barbá, R. H., Negueruela, I., et al. 2021, A&A, 655, A4
Villamariz, M. R., & Herrero, A. 2005, A&A, 442, 263
Villaseñor, J. I., Taylor, W. D., Evans, C. J., et al. 2021, MNRAS, 507, 5348
Walborn, N. R., Sana, H., Simón-Díaz, S., et al. 2014, A&A, 564, A40
Wang, J., Townsley, L. K., Feigelson, E. D., et al. 2007, ApJS, 168, 100
Wang, L., Gies, D. R., Peters, G. J., et al. 2021, AJ, 161, 248
Williams, S. J., Gies, D. R., Hillwig, T. C., McSwain, M. V., & Huang, W. 2013, AJ, 145, 29
Wolff, S. C., Edwards, S., & Preston, G. W. 1982, ApJ, 252, 322