000003951 001__ 3951
000003951 005__ 20190128153251.0
000003951 0247_ $$2DOI$$a10.1093/mnras/sty308
000003951 037__ $$aSCART-2019-0084
000003951 100__ $$aAerts, C.
000003951 245__ $$aK2 photometry and HERMES spectroscopy of the blue supergiant ρ Leo: rotational wind modulation and low-frequency waves
000003951 260__ $$c2018
000003951 520__ $$aWe present an 80-d long uninterrupted high-cadence K2 light curve of the B1Iab supergiant ρ Leo (HD 91316), deduced with the method of halo photometry. This light curve reveals a dominant frequency of frot = 0.0373 d−1 and its harmonics. This dominant frequency corresponds with a rotation period of 26.8 d and is subject to amplitude and phase modulation. The K2 photometry additionally reveals multiperiodic low-frequency variability (<1.5 d−1) and is in full agreement with low-cadence high-resolution spectroscopy assembled during 1800 d. The spectroscopy reveals rotational modulation by a dynamic aspherical wind with an amplitude of about 20 km s−1 in the H α line, as well as photospheric velocity variations of a few km s−1 at frequencies in the range 0.2–0.6 d−1 in the Si iii 4567 Å line. Given the large macroturbulence needed to explain the spectral line broadening of the star, we interpret the detected photospheric velocity as due to travelling superinertial low-degree large-scale gravity waves with dominant tangential amplitudes and discuss why ρ Leo is an excellent target to study how the observed photospheric variability propagates into the wind.
000003951 594__ $$aNO
000003951 6531_ $$aasteroseismology
000003951 6531_ $$atechniques: photometric
000003951 6531_ $$atechniques: spectroscopic
000003951 6531_ $$astars: massive
000003951 6531_ $$astars: oscillations
000003951 6531_ $$astars: rotation
000003951 700__ $$aBowman, D. M.
000003951 700__ $$aSímon-Díaz, S.
000003951 700__ $$aBuysschaert, B.
000003951 700__ $$aJohnston, C.
000003951 700__ $$aMoravveji, E.
000003951 700__ $$aBeck, P. G.
000003951 700__ $$aDe Cat, P.
000003951 700__ $$aTriana, S.
000003951 700__ $$aAigrain, S.
000003951 700__ $$aCastro, N.
000003951 700__ $$aHuber, D.
000003951 700__ $$aWhite, T.
000003951 773__ $$c1234-1241$$n1$$pMonthly Notices of the Royal Astronomical Society$$v476$$y2018
000003951 8560_ $$fpeter.decat@observatoire.be
000003951 85642 $$ahttps://academic.oup.com/mnras/article/476/1/1234/4848277
000003951 905__ $$apublished in
000003951 980__ $$aREFERD