WR 110: a single wolf-rayet star with corotating interaction regions in its wind?
A 30 day contiguous photometric run with the Microvariability and Oscillations of STars (MOST) satellite on the WN5-6b star WR110 (HD 165688) reveals a fundamental periodicity of P= 4.08 0.55days along with a number of harmonics at periods P/n, with n 2, 3, 4, 5, and 6, and a few other possible stra...
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , |
|---|---|
| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2011
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84077 |
| Aporte de: |
| id |
I19-R120-10915-84077 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas stars: individual stars: rotation stars: winds, outflows stars: Wolf-Rayet WR 110 |
| spellingShingle |
Ciencias Astronómicas stars: individual stars: rotation stars: winds, outflows stars: Wolf-Rayet WR 110 Chené, A. N. Moffat, A. F. J. Cameron, C. Fahed, R. Gamen, Roberto Claudio Lefèvre, L. Rowe, J. F. St-Louis, N. Muntean, V. Chevrotière, A. de la Guenther, D. B. Kuschnig, R. Matthews, J. M. Rucinski, S. M. Sasselov, D. Weiss, W. W. WR 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| topic_facet |
Ciencias Astronómicas stars: individual stars: rotation stars: winds, outflows stars: Wolf-Rayet WR 110 |
| description |
A 30 day contiguous photometric run with the Microvariability and Oscillations of STars (MOST) satellite on the WN5-6b star WR110 (HD 165688) reveals a fundamental periodicity of P= 4.08 0.55days along with a number of harmonics at periods P/n, with n 2, 3, 4, 5, and 6, and a few other possible stray periodicities and/or stochastic variability on timescales longer than about a day. Spectroscopic radial velocity studies fail to reveal any plausible companion with a period in this range. Therefore, we conjecture that the observed light-curve cusps of amplitude 0.01mag that recur at a 4.08 day timescale may arise in the inner parts, or at the base, of a corotating interaction region (CIR) seen in emission as it rotates around with the star at constant angular velocity. The hard X-ray component seen in WR110 could then be a result of a high velocity component of the CIR shock interacting with the ambient wind at several stellar radii. Given that most hot, luminous stars showing CIRs have two CIR arms, it is possible that either the fundamental period is 8.2 days or, more likely in the case of WR110, there is indeed a second weaker CIR arm for P= 4.08 days, that occurs two-thirds of a rotation period after the main CIR. If this interpretation is correct, WR110 therefore joins the ranks with three other single WR stars, all WN, with confirmed CIR rotation periods (WR1, WR6, and WR134), albeit with WR110 having by far the lowest amplitude photometric modulation. This illustrates the power of being able to secure intense, continuous high-precision photometry from space-based platforms such as MOST. It also opens the door to revealing low-amplitude photometric variations in other WN stars, where previous attempts have failed. If all WN stars have CIRs at some level, this could be important for revealing sources of magnetism or pulsation in addition to rotation periods. |
| format |
Articulo Articulo |
| author |
Chené, A. N. Moffat, A. F. J. Cameron, C. Fahed, R. Gamen, Roberto Claudio Lefèvre, L. Rowe, J. F. St-Louis, N. Muntean, V. Chevrotière, A. de la Guenther, D. B. Kuschnig, R. Matthews, J. M. Rucinski, S. M. Sasselov, D. Weiss, W. W. |
| author_facet |
Chené, A. N. Moffat, A. F. J. Cameron, C. Fahed, R. Gamen, Roberto Claudio Lefèvre, L. Rowe, J. F. St-Louis, N. Muntean, V. Chevrotière, A. de la Guenther, D. B. Kuschnig, R. Matthews, J. M. Rucinski, S. M. Sasselov, D. Weiss, W. W. |
| author_sort |
Chené, A. N. |
| title |
WR 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| title_short |
WR 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| title_full |
WR 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| title_fullStr |
WR 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| title_full_unstemmed |
WR 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| title_sort |
wr 110: a single wolf-rayet star with corotating interaction regions in its wind? |
| publishDate |
2011 |
| url |
http://sedici.unlp.edu.ar/handle/10915/84077 |
| work_keys_str_mv |
AT chenean wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT moffatafj wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT cameronc wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT fahedr wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT gamenrobertoclaudio wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT lefevrel wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT rowejf wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT stlouisn wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT munteanv wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT chevrotiereadela wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT guentherdb wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT kuschnigr wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT matthewsjm wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT rucinskism wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT sasselovd wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind AT weissww wr110asinglewolfrayetstarwithcorotatinginteractionregionsinitswind |
| bdutipo_str |
Repositorios |
| _version_ |
1764820488353218562 |