V838 MONOCEROTIS - GSC 4822.39


V838 Mon is an unique object, probably a prototype of new class star erupting into a cool supergiant. The star outburst was first recognized as a possible nova by Nicholas J. Brown, Quinns Rocks, W. Australia, (IAU Circular 7785) on January 6.6 UT at about magnitude 10 on a T-Max 400 film. The principal maximum of brightness (V=6.6) occurred on February 6. A less intense outburst occurred in March 2002. Prior to outburst V838 Mon was a stable hot blue star of B=15.8. The star has evolved now like a very red M10III star (see J. Wisniewski, ApJ, 588, 486 (2003)). Localization of the object is (2000.0): RA = 7h04m04.85s - DEC = -0350'50.24"

This page present a spectroscopic observation run of V838 Mon. The period cover with some details the February and March 2002 outburst. The observation are made from my private observatory in Castanet-Tolosan (near Toulouse, South of France). Additional observations with the Pic du Midi observatory 24-inch telescope (A. Rondi, S. Rondi, V. Desnoux, C. Buil) show the spectacular red evolution of the star on April 2003. For your opinion, these results are characteristics of today amateur possibility with modest aperture telescopes but with sensitive receptors and optimized low-cost spectrograph.


Journal of spectroscopic observations
 

Date (UT)

Instrument

Exposure

Estimated mag.

February 4.960, 2002

T212

1200 s

V = 7.3

February 7.011, 2002

T212

1680 s

V = 6.7

February 7.890, 2002

T212

1800 s

-

February 10.816, 2002

T212

3840 s

V = 7.6

February 11.827, 2002

T212

4580 s

-

February 12.864, 2002

T212

2760 s

V = 8.2

February 25.832, 2002

L106

4560 s

V = 8.2

March 3.849, 2002

L106

6360 s

V = 7.8

March 10.909, 2002

T212

3000 s

V = 7.2

March 20.856, 2002

T212

2880 s

V = 7.2

March 22.838, 2002

L128

2160 s

V = 7.8

April 23.794, 2003

T600

1080 s

 


Instrumentation description

      Code L128
      
Telescope: Takahashi FS-128 - 5 inch aperture refractor - F/D=8
      Spectrograph: dispersion of 2.81 A/pixel - spectral range from 4580 to 6650 A - 
R=800 @ 6563 A
      CCD: Audine KAF-401E CCD camera - 9x9 microns pixel
      Observatory: Castanet Tolosan (France) - IAU959
      Observer: C. Buil

      Code L106
      
Telescope: Takahashi FSQ-106  - 4 inch aperture refractor - F/D=5
      Spectrograph: dispersion of 2.81 A/pixel - spectral range from 4580 to 6650 A -  
R=800 @ 6563 A
      CCD: Audine KAF-401E CCD camera - 9x9 microns pixel
      Observatory: Castanet Tolosan (France) - IAU959
      Observer: C. Buil 

      Code T212:
      
Telescope: Takahashi CN-212 - 8 inch aperture telescope - F/D=3.3
      Spectrograph: dispersion of 0.3805 A/pixel - spectral range from 6400 to 6800 A - R=7000 @ 6563 A
      Audine KAF-1602E CCD camera - 9x9 microns pixel
      Observatory: Castanet Tolosan (France) - IAU959
      Observer: C. Buil

      Code T600:
      Telescope: 24-inch telescope - F/D=3.5
      Spectrograph: dispersion of 5.80 A/pixel - spectral range from 6500 to 9900 A - R=540 @ 6563 A (construc. A. & S. Rondi)
      CCD: Audine KAF-1602E CCD camera - 18x18 microns pixel (bin. 2x2)
      Observatory: Pic du Midi Observatory (France)
      Observers: A. Rondi, S. Rondi, V. Desnoux, C. Buil

Notes: All the data are corrected for the instrumental responses. Observation where reduced with Iris (developed by C. Buil) and VisualSpec (developed by V. Desnoux) using standard techniques. You can download ASCII file format data for all the date.


Feb. 4.960 UT, 2002 observation


Download 040202.DAT

Feb. 7.011 UT, 2002 observation




Download 060202.DAT

Feb. 7.890 UT, 2002 observation
  



Download 070202.DAT

Feb. 10.816 UT, 2002 observation




Download 100202.DAT

Feb. 11.827 UT, 2002 observation
 




Download 110202.DAT

Feb. 12.864 UT, 2002 observation




Download 120202.DAT

Feb. 25.832 UT, 2002 observation


Click on the image for enlarge.
Download 250202.DAT
March 3.849 UT, 2002 observation

 
Click on the image for enlarge.
Download 030302.DAT
 March 10.909 UT, 2002 observation




Download 100302.DAT

March 20.856 UT, 2002 observation




Download 200302.DAT

March 22.838 UT, 2002 observation

      

Click on the image for enlarge.
Download 220302.DAT
Some major features (see IAUC 7812): Ca I at 6500 A, 5857 A and 5270 A, Na I at 5890 A and 5896 A (very strong), Si I at 6142 A, Y II at 5663 A, C I at 6611 A.

April 23.794 UT, 2003 observation


Download 230403.DAT - The continuum is normalized at value 1 at wavelength 7000 angstroms


 Summary of the high resolution observations (fast evolution structures + animated GIF)





  Animation 1

  Animation 2