The vicinity of the galactic supergiant B[e] star CPD -57 2874 from near- and mid-IR long baseline spectro-interferometry with the VLTI (AMBER and MIDI)

Simple item page
dc.creatorde Souza, A. Domiciano
dc.creatorDriebe, T.
dc.creatorChesneau, O.
dc.creatorHofmann, K. -H.
dc.creatorKraus, S.
dc.creatorMiroshnichenko, A. S.
dc.creatorOhnaka, K.
dc.creatorPetrov, R. G.
dc.creatorPreibisch, Th.
dc.creatorStee, P.
dc.creatorWeigelt, G.
dc.date2005-10-26
dc.date.accessioned2026-07-07T06:44:02Z
dc.date.available2026-07-07T06:44:02Z
dc.descriptionWe present the first spectro-interferometric observations of the circumstellar envelope (CSE) of a B[e] supergiant (CPD -57 2874), performed with the Very Large Telescope Interferometer (VLTI) using the beam-combiner instruments AMBER (near-IR interferometry with three 8.3 m Unit Telescopes or UTs) and MIDI (mid-IR interferometry with two UTs). Our observations of the CSE are well fitted by an elliptical Gaussian model with FWHM diameters varying linearly with wavelength. Typical diameters measured are $\simeq1.8\times3.4$ mas or $\simeq4.5\times8.5$ AU (adopting a distance of 2.5 kpc) at $2.2\micron$, and $\simeq12\times15$ mas or $\simeq30\times38$ AU at $12\micron$. We show that a spherical dust model reproduces the SED but it underestimates the MIDI visibilities, suggesting that a dense equatorial disk is required to account for the compact dust-emitting region observed. Moreover, the derived major-axis position angle in the mid-IR ($\simeq144\degr$) agrees well with previous polarimetric data, hinting that the hot-dust emission originates in a disk-like structure. Our results support the non-spherical CSE paradigm for B[e] supergiants.
dc.descriptionTo appear in the ASP proceedings of the Workshop "Stars with the B[e] Phenomenon"
dc.identifierhttps://arxiv.org/abs/astro-ph/0510736
dc.identifierhttp://arxiv.org/abs/astro-ph/0510736
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102640
dc.subjectAstrophysics
dc.titleThe vicinity of the galactic supergiant B[e] star CPD -57 2874 from near- and mid-IR long baseline spectro-interferometry with the VLTI (AMBER and MIDI)
dc.typetext

Files

Collections

arXiv