Abstract

SD1 Probing the disk of Be and B[e] stars with the MIDI instrument (alfa Ara)

We propose to obtain the first measurements in the mid-infrared of theemitting regions around Be and B[e] stars in order to constrain theirextension and flattening. These first measurements will be crucial toprecise the outer scale of the Be and B[e] environments, their oblatenessfar from the star and they will test the mechanisms that may transform a "normal" B star into a Be or B[e] star.Note:Long files (usually the fringe tracking ones) had to be splitto accomodate a maximum file size of 100 Mbytes. Thus one fringe trackingmay be represented by several files.Example:the files2003-06-16T01:35:27.000_01.fits alfa AraSFringeTrack2003-06-16T01:35:27.000_02.fits alfa Ara SFringeTrack continuation2003-06-16T01:35:27.000_03.fits alfa Ara SFringeTrack continuationall refer to one fringe tracking and logically constitutethis one fringe tracking file. In the headers of thepreliminary calibrated visibilities belowan abbreviated but easily understandable version of the filenames is used (and these filenames give the beginning times forthe individual pieces).The unphysically high visibility (values > 1.0) resulting for thesecond measurement is a consequence of increased sky coverage bydense cirrus during the morning hours of this night.

Table 1: MIDI Science Demonstration Data (Alpha Ara)

Files Description

       File Name                   Target  Science/Calibrator   Category



2003-06-16T00:59:12.000_01.fits   HD 152786 CAcquisition

2003-06-16T01:06:42.000_01.fits   HD 152786C FringeTrack

2003-06-16T01:06:42.000_02.fits   HD 152786CFringeTrack continuation

2003-06-16T01:06:42.000_03.fits   HD 152786CFringeTrack continuation

2003-06-16T01:12:15.000_01.fits   HD 152786CPhotometry (A)

2003-06-16T01:14:33.000_01.fits   HD 152786CPhotometry (B)

2003-06-16T01:27:25.000_01.fits   alfa AraSAcquisition

2003-06-16T01:35:27.000_01.fits   alfa AraSFringeTrack

2003-06-16T01:35:27.000_02.fits   alfa Ara   SFringeTrack continuation

2003-06-16T01:35:27.000_03.fits   alfa Ara   SFringeTrack continuation

2003-06-16T01:40:55.000_01.fits   alfa Ara   SPhotometry (A)

2003-06-16T01:43:12.000_01.fits   alfa Ara   SPhotometry (B)



  

2003-06-17T06:21:34.000_01.fits   delta sgr CAcquisition

2003-06-17T06:35:05.000_01.fits   delta sgr CFringeTrack

2003-06-17T06:35:05.000_02.fits   delta sgr CFringeTrack continuation

2003-06-17T06:35:05.000_03.fits   delta sgr CFringeTrack continuation

2003-06-17T06:40:33.000_01.fits   delta sgr CPhotometry (A)

2003-06-17T06:42:21.000_01.fits   delta sgr CPhotometry (B)

2003-06-17T07:01:20.000_01.fits   alfa Ara   SAcquisition

2003-06-17T07:09:19.000_01.fits   alfa Ara  SFringeTrack

2003-06-17T07:09:19.000_02.fits   alfa Ara   SFringeTrack continuation

2003-06-17T07:09:19.000_03.fits   alfa Ara  SFringeTrack continuation

2003-06-17T07:14:47.000_01.fits   alfa Ara   SPhotometry (A)

2003-06-17T07:17:05.000_01.fits   alfa Ara   SPhotometry (B)

Preliminary Calibrated Visibilities

Object:     alfara



Slit position angle 91 degrees             

Slit width 0.5'', slit length 2.0''



Projected baseline 100.72 m at P.A. 7 degrees (E of N)



Fringe track: 

MIDI.2003-06-16T01:35:27.000.fits

MIDI.2003-06-16T01:36:43.451.fits

MIDI.2003-06-16T01:37:59.901.fits

Photometry:

MIDI.2003-06-16T01:40:55.000.fits

MIDI.2003-06-16T01:43:12.000.fits



Calibrator: hd152786

Fringe track: 

MIDI.2003-06-16T01:06:42.000.fits

MIDI.2003-06-16T01:07:58.451.fits

MIDI.2003-06-16T01:09:14.901.fits

Photometry:

MIDI.2003-06-16T01:12:15.000.fits

MIDI.2003-06-16T01:14:33.000.fits



   Wavelength    Bandwidth   Visibility

     [micron]     [micron]

      13.3571     0.111423     0.984093

      13.2061     0.115116     0.986323

      13.0501     0.118809     0.972345

      12.8892     0.122502     0.974011

      12.7234     0.126196     0.977643

      12.5527     0.129889     0.985489

      12.3771     0.133583     0.969192

      12.1965     0.137278     0.978870

      12.0110     0.140971     0.976942

      11.8206     0.144665     0.972773

      11.6252     0.148358     0.968097

      11.4250     0.152052     0.963950

      11.2198     0.155746     0.966620

      11.0096     0.159438     0.958965

      10.7946     0.163133     0.955088

      10.5746     0.166826     0.948989

      10.3497     0.170520     0.946158

      10.1199     0.174213     0.940153

      9.88515     0.177907     0.934377

      9.64548     0.181601     0.938632

      9.40088     0.185294     0.931832

      9.15136     0.188988     0.918652

      8.89691     0.192681     0.915094

      8.63754     0.196375     0.900692

      8.37325     0.200068     0.886814

      8.10402     0.203762     0.858066

      7.82988     0.207456     0.813725

      7.55081     0.211149     0.811803

      7.26681     0.214843      1.32501

      6.97790     0.218536      6.96998

      6.68405     0.222230      3.20706



---------------------------------------------------------



Object:     alfara



Slit position angle 141 degrees             

Slit width 0.5'', slit length 2.0''



Projected baseline 79.7 m at P.A. 55 degrees (E of N)





Fringe track: 

MIDI.2003-06-17T07:09:19.000.fits

MIDI.2003-06-17T07:10:35.451.fits

MIDI.2003-06-17T07:11:51.901.fits

Photometry:

MIDI.2003-06-17T07:14:47.000.fits

MIDI.2003-06-17T07:17:05.000.fits



Calibrator: delta_Sgr_cal

Fringe track: 

MIDI.2003-06-17T06:35:05.000.fits

MIDI.2003-06-17T06:36:21.451.fits

MIDI.2003-06-17T06:37:37.901.fits

Photometry:

MIDI.2003-06-17T06:40:33.000.fits

MIDI.2003-06-17T06:42:21.000.fits



   Wavelength    Bandwidth   Visibility

     [micron]     [micron]

      13.3571     0.111423      1.17902

      13.2061     0.115116      1.17971

      13.0501     0.118809      1.16710

      12.8892     0.122502      1.15344

      12.7234     0.126196      1.16037

      12.5527     0.129889      1.17352

      12.3771     0.133583      1.18534

      12.1965     0.137278      1.17232

      12.0110     0.140971      1.17816

      11.8206     0.144665      1.19502

      11.6252     0.148358      1.20294

      11.4250     0.152052      1.20516

      11.2198     0.155746      1.20467

      11.0096     0.159438      1.20040

      10.7946     0.163133      1.19342

      10.5746     0.166826      1.21127

      10.3497     0.170520      1.23681

      10.1199     0.174213      1.25555

      9.88515     0.177907      1.27409

      9.64548     0.181601      1.28803

      9.40088     0.185294      1.29911

      9.15136     0.188988      1.30209

      8.89691     0.192681      1.29545

      8.63754     0.196375      1.30307

      8.37325     0.200068      1.30484

      8.10402     0.203762      1.28849

      7.82988     0.207456      1.28748

      7.55081     0.211149      1.20127

      7.26681     0.214843      1.53261

      6.97790     0.218536      8.53652

      6.68405     0.222230     0.638149