2010A&A...513L..11A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.15CEST07:01:24

2010A&A...513L..11A - Astronomy and Astrophysics, volume 513, L11-11 (2010/4-1)

Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD 50064.

AERTS C., LEFEVER K., BAGLIN A., DEGROOTE P., OREIRO R., VUCKOVIC M., SMOLDERS K., ACKE B., VERHOELST T., DESMET M., GODART M., NOELS A., DUPRET M.-A., AUVERGNE M., BAUDIN F., CATALA C., MICHEL E. and SAMADI R.

Abstract (from CDS):

We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD50064 (V=8.21). CoRoT space photometry and follow-up high-resolution spectroscopy with a time base of 137d and 169d, respectively, was gathered, analysed, and interpreted using standard time series analysis and light curve modelling methods, as well as spectral line diagnostics. The space photometry reveals one period of 37d, which undergoes a sudden amplitude change with a factor 1.6. The pulsation period is confirmed in the spectroscopy, which additionally reveals metal line radial velocity values differing by ∼30km/s depending on the spectral line and on the epoch. We estimate Teff∼13500K, logg∼1.5 from the equivalent width of Si lines. The Balmer lines reveal that the star undergoes episodes of changing mass loss on a time scale similar to the changes in the photometric and spectroscopic variability, with an average value of log{dot}(M)≃-5 (in M/yr). We tentatively interpret the 37d period as the result of a strange mode oscillation.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: oscillations - stars: winds, outflows - stars: individual: HD 50064 - stars: atmospheres - supergiants

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 50064 Em* 06 51 34.1060183287 +00 17 50.465846394 8.75 9.06 8.30 7.51 6.88 B6Ie 82 1
2 HD 160529 sg* 17 41 59.0257256544 -33 30 13.702939546 8.17 7.87 6.66 5.50 4.51 A2Ia 183 1

    Equat.    Gal    SGal    Ecl

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2020.07.15-07:01:24

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