WAGNER R.M., SCHWARZ G., STARRFIELD S., MUNARI U., GIRO E., SIVIERO A., HENDEN A., SZKODY P. and BOND H.
Abstract (from CDS):
R. M. Wagner, LBT Observatory; G. Schwarz, University of Arizona; S. Starrfield, Arizona State University; U. Munari, E. Giro, and A. Siviero, Asiago Observatory; A. Henden, USRA and U.S. Naval Observatory, Flagstaff (USNOFS); P. Szkody, University of Washington; and H. Bond, Space Telescope Science Institute, write that optical spectra, obtained with the 6.5-m MMT (range 383-905 nm, resolution 0.6 nm) on Sept. 13.49 UT and with the Asiago 1.82-m telescope (+ AFOSC) on Sept. 12.13 (range 485-780 nm, resolution 0.8 nm) and Sept. 13.15 (in echelle mode; range 360-860 nm; resolving power 3800), reveal a dramatic change when compared to their previous spectra (cf. IAUC 7982, 7992, 8005). In addition to the Balmer and He I absorption lines characteristic of a B3 V star (shortward of 600 nm) and the TiO and VO bands (longward of 600 nm) that dominated their previous spectra, the spectrum now exhibits absorption bands of TiO, VO, ZrO, YO, and perhaps CrO, LaO, and ScO in the region 490-600 nm that were previously absent. Overlapping bands make positive identification difficult. The new spectra suggest that, while the B3 V star is still visible in the U and B bands, the O-rich and very cool atmosphere of the outbursting star is now also dominating the V band (and not only the R and I bands, as it has been since Oct. 2002). The changes are accompanied by a 0.5-mag brightening in V, R, and I bands since last May (on Sept. 11-13, V = 15.50, B-V = +1.00, V-R_c = +2.70, Rc–Ic = +3.25; formal errors 0.01 mag; USNOFS 1.0-m telescope), but with no appreciable changes in the near-infrared (on Sept. 13.51, J = 6.76, H = 5.84, K' = 5.10, L' = 3.54; errors 0.03 mag; USNOFS 1.55-m telescope + ASTROCAM). Monitoring of the changes in progress is urged.
(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases
Other object types:
*
(GSC,UCAC4,...),
No*
(2017ARep,NOVA),
V*
(V*,AAVSO),
Mas
(2019ApJ,[RMB2014]),
NIR
(DENIS,2MASS),
MIR
(WISEA,WISE),
IR
(IRAS,PSCz),
LP*
(2022yCat),
**
(2003IAUC)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
References (427 between 1850 and 2024) (Total 427)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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