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Science

/Science

La science, la vraie !

3D imaging of Phi Persei

I commited again "3D" imaging on visible interferometry data of the Be star Phi Persei After the work on the SgA[e] star HD62623, I updated the self-calibration algorithm to take into account the specificities of the VEGA data. The obtained images are very nice, as they clearly detail the velocity field of the Be star [...]

By | juillet 22nd, 2015|Publications, Science|Commentaires fermés sur 3D imaging of Phi Persei

HD62623

HD 62623 is a hot, massive star of spectral type A (i.e. with a temperature around 10 000 Kelvin). It is one of the few stars of its kind which hosts dust in its environment. Such a hot and massive star is not expected to host dust in its vicinity. We managed to disentangle the [...]

By | décembre 12th, 2014|Publications, Science|Commentaires fermés sur HD62623

V838 Mon is shrinking !

This paper is part of a series of the two last papers written by my colleague and friend Olivier Chesneau which unfortunately passed away in May 2014. V838 Mon is a famous cool star which suddenly brightened in 2002 in a series of outbursts. It was first thought it was a nova, but the subsequent [...]

By | octobre 14th, 2014|Publications, Science|Commentaires fermés sur V838 Mon is shrinking !

V854 Cen is surrounded by a dusty shell !

This paper is part of a series of the two last papers written by my colleague and friend Olivier Chesneau which unfortunately passed away in May 2014. V854 Cen is an emblematic star of the R Crb spectral type. These stars are helium-rich and occasionally see their light decrease by several magnitudes. It is thought [...]

By | octobre 7th, 2014|Publications, Science|Commentaires fermés sur V854 Cen is surrounded by a dusty shell !

The hyper giant peanut

See also the ESO press release on HR5171A HR5171 A is a yellow hypergiant star, which was not well studied in the past. In that work, we measured the angular diameter of the star by means of optical long-baseline interferometry, far larger than expected with a 1300 solar diameter. We also discovered a companion star, which [...]

By | mars 26th, 2014|Publications, Science|Commentaires fermés sur The hyper giant peanut

AMBER blind mode SPIE paper

Here is a first paper describing the "blind mode" of AMBER used in 2011 (see Making VLTI go deeper). Link to the paper

By | janvier 24th, 2013|Instruments, Publications, Science|Commentaires fermés sur AMBER blind mode SPIE paper

HD87643

 HD 87643 is a member of a very enigmatic class of stellar objects, the so-called class of "stars with the B[e] phenomenon". This B[e] phenomenon is a conjuction of a B-type central star emission lines from hydrogen, and forbidden lines an infrared excess, related to the presence of dust Observations of HD 87643 were part [...]

By | mars 7th, 2012|Publications, Science|Commentaires fermés sur HD87643

Gamma Velorum

Gamma² Velorum is one of the brightest stars in the southern skies. With a Hipparcos-measured distance of 258 pc, it is also the closest Wolf-Rayet star to our solar system, making it a perfect laboratory to study one of these peculiar stars in details. It is in fact composed of two stars, being a SB2-type [...]

By | mars 7th, 2012|Publications, Science|Commentaires fermés sur Gamma Velorum

Making VLTI go deeper

A joint ESO/CNRS/INAF announcement has been issued on an achievement I was part of : observing the faintest-ever object with a combination of long-baseline interferometry and spectroscopy. Indeed, We pointed the AMBER instrument at the quasar 3C273, which is the farest galaxy ever observed by long-baseline interferometry. It was already observed with interferometry, but here we used the spectroscopic [...]

By | novembre 3rd, 2011|Instruments, Publications, Science|0 Comments

Images with the VLTI

Here is a seminar presentation I gave at the Nice observatory (in French) and at Rome observatory (in English). I present the current state of VLTI and the advent image reconstruction for optical / infrared interferometry. Rome in English Nice en Francais

By | octobre 6th, 2011|Science|Commentaires fermés sur Images with the VLTI