18 research outputs found
Is macroturbulence in OB Sgs related to pulsations?
As part of a long term observational project, we are investigating the
macroturbulent broadening in O and B supergiants (Sgs) and its possible
connection with spectroscopic variability phenomena and stellar oscillations.
We present the first results of our project, namely firm observational evidence
for a strong correlation between the extra broadening and photospheric
line-profile variations in a sample of 13 Sgs with spectral types ranging from
O9.5 to B8.Comment: 2 pages, 1 figure. Poster contribution to the proceedings of the
IAU272 "Active OB stars: structure, evolution, mass loss and critical limits
The spectroscopic observations of CoRoT asteroseismic targets with HARPS
CoRoT photometric measurements of asteroseismic targets need complementary
ground-based spectroscopic observations. We are using the planet-hunter HARPS
spectrograph attached to the 3.6m-ESO telescope in the framework of two
consecutive Large Programmes. We discuss its use to study line-profile
variations and we report on a specific result obtained for the Delta Sct star
HD 170699.Comment: Proceedings of the 20th Stellar Pulsation Conference Series: "Impact
of new instrumentation & new insights in stellar pulsations", 5-9 September
2011, Granada, Spai
Report on the first run of the ESO LP 185.D-0056 ([email protected])
The ESO Large Programme 185.D-0056 started with the HARPS instrument at the 3.6m ESO telescope in June and July 2010. The log of the these observations, the problems encountered, some tips, the situation of the publications, and a look to the future are given
Report on the second run of the ESO Large Programme
The ground鈥揵ased spectro- scopic observations complementing the COROT ones have con- tinued in June and July 2007. The log of the observations, a few preliminary results, tips for the next observers and a look to the future are given
Report on the third run of the ESO Large Programme
The ground鈥揵ased spectroscopic observations complementing the COROT ones have continued in December 2007 and January 2008. The log of the observations, a few preliminary results and a look to the future are given
Are the Stellar Winds in IC1613 stronger than expected?
In this poster we present the results of our analyses of three early massive
stars in IC 1613, whose spectra have been observed with VIMOS and analyzed with
CMFGEN and FASTWIND. One of the targets resulted a possible LBV and the other
two are Of stars with unexpectedly strong winds. The Of stars seem to be
strongly contaminated by CNO products. Our preliminary results may represent a
challenge for the theory of stellar atmospheres, but they still have to be
confirmed by the analysis of more objects and a more complete coverage of the
parameter space.Comment: 2 pages. Poster contribution to the proceedings of the IAU272 "Active
OB Stars: structure, evolution, mass loss and critical limits