Space and Planetary Science; Astronomy and Astrophysics
Abstract :
[en] ABSTRACT
WR21 and WR31 are two WR + O binaries with short periods, quite similar to the case of V444 Cyg. The XMM-Newton observatory has monitored these two objects and clearly revealed phase-locked variations as expected from colliding winds. The changes are maximum in the soft band (0.5–2.0 keV, variations by a factor 3–4) where they are intrinsically linked to absorption effects. The increase in absorption due to the dense WR wind is confirmed by the spectral analysis. The flux maximum is however not detected exactly at conjunction with the O star in front but slightly afterwards, suggesting Coriolis deflection of the collision zone as in V444 Cyg. In the hard band (2–10 keV), the variations (by a factor of 1.5–2.0) are much more limited. Because of the lower orbital inclinations, eclipses as observed for V444 Cyg are not detected in these systems.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Johnson, Rachel; Department of Physics and Astronomy, University of Denver , Denver, CO 80210 USA
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Hoffman, Jennifer L ; Department of Physics and Astronomy, University of Denver , Denver, CO 80210 USA
Language :
English
Title :
Colliding winds in WR21 and WR31 – I. The X-ray view
Asplund M., Grevesse N., Sauval A. J., Scott P., 2009, ARA&A, 47, 481
Bailer-Jones C. A. L., Rybizki J., Fouesneau M., Demleitner M., Andrae R., 2021, AJ, 161, 147
Bestenlehner J. M., Crowther P. A., Broos P. S., Pollock A. M. T, Townsley L. K., 2022, MNRAS, 510, 6133
Buckley D. A. H., Swart G. P., Meiring J. G., 2006, in Stepp L. M., ed., Proc. SPIE Conf. Ser. Vol. 6267, Ground-based and Airborne Telescopes. SPIE, Bellingham, p. 62670Z
Cherepashchuk A. M., 1976, Sov. Astron. Lett., 2, 138
Espinoza-Galeas D., Corcoran M. F., Hamaguchi K. et al., 2022, ApJ, 933, 136
Fahed R., Moffat A. F. J., 2012, MNRAS, 424, 1601
Fullard A. G., O Brien J. T., Kerzendorf W. E., Shrestha M., Hoffman J. L., Ignace R., van der Smagt P., 2022, ApJ, 930, 89
Gayley K. G., Owocki S. P., Cranmer S. R., 1997, ApJ, 475, 786
Gosset E., 2007, Habilitation Thesis. University of Li ège
Gosset E., Naze Y., Sana H., Rauw G., Vreux J.-M., 2009, A&A, 508, 805
Graham M. J., Drake A. J., Djorgovski S. G., Mahabal A. A., Donalek C., Duan V., Maker A., 2013, MNRAS, 434, 3423
Hamann W.-R. et al., 2019, A&A, 625, A57
Johnson R. A., Fullard A. G., Lomax J. R., Cooper K., Leon-Alvarez D., Hoffman J. L., Nordsieck K. H., 2019, Res. Notes Am. Astron. Soc., 3, 146
Kobulnicky H. A., Nordsieck K. H., Burgh E. B., Smith M. P., Perci v al J. W., Williams T. B., O Donoghue D., 2003, in Iye M., Moorwood A. F. M., eds, Proc. SPIE Conf. Ser. Vol. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes. SPIE, Bellinghaum, p. 1634
Lamontagne R., Moffat A. F. J., Drissen L., Robert C., Matthews J. M., 1996, AJ, 112, 2227
Lomax J. R. et al., 2015, A&A, 573, A43
Martins F., Schaerer D., Hillier D. J., 2005, A&A, 436, 1049
Moffat A. F. J., Corcoran M. F., 2009, ApJ, 707, 693
Naze Y. et al., 2011, ApJS, 194, 7
Naze Y., Koenigsberger G., Pittard J. M., Parkin E. R., Rauw G., Corcoran M. F., Hillier D. J., 2018, ApJ, 853, 164
Naze Y., Gosset E., Marechal Q., 2021, MNRAS, 501, 4214
Panagiotou C., Walter R., 2018, A&A, 610, A37
P ande y J. C., P ande y S. B., Karmakar S., 2014, ApJ, 788, 84
Pollock A. M. T., 1987, ApJ, 320, 283
Pollock A. M. T., Crowther P. A., Tehrani K., Broos P. S., Townsley L. K., 2018, MNRAS, 474, 3228
Rauw G., Stevens I. R., Pittard J. M., Corcoran M. F., 2000, MNRAS, 316, 129
Schwarzenberg-Czerny A., 1989, MNRAS, 241, 153
Stevens I. R., Blondin J. M., Pollock A. M. T., 1992, ApJ, 386, 265
Willis A. J., Schild H., Stevens I. R., 1995, A&A, 298, 549
