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A legfrissebb hirek szerint gyorsan halvanyodik, ami nem igazan jellemzo
a szupernovakra:
http://www.astronomerstelegram.org/?read=4416
SN2009ip: Dimming Rapidly
ATel #4416; J. C. Martin, J. O´Brien, J. Hubbell-Thomas (U. of Illinois
Springfield)
on 24 Sep 2012; 16:04 UT
ATEL #4412 (Smith & Mauerhan) recently suggested that supernova impostor
SN2009ip has re-brightened as a true supernova. ATEL #4414 (Margutti et
al.) reported Swift observations indicating that SN2009ip is declining
in magnitude and not a true supernova. We obtained V and R observations
with the 20-inch telescope at the Henry R. Barber Astronomical
Observatory (University of Illinois Springfield). The observations were
taken at a high airmass (sec(Z) > 2.7 - 3.0) and are uncorrected for
Galactic extinction. There is also a chance of minor uncorrected
contamination of the target by a red star (USNO B2 mag B ~ 20, R ~18)
about 5 arcseconds to the northeast of the target. However the limiting
magnitudes in the images and the brightness of SN2009ip are
significantly brighter than the possible contaminator. We measured the
following preliminary magnitudes on UT September 11, 2012 (JD
2456181.67) and UT September 24, 2012 (JD 2456194.66): JD 2456181.67; V
= 16.92 +/- 0.05; (V-R) = 0.38 +/- 0.07 JD 2456194.66; V = 17.70 +/-
0.08; (V-R) = 0.62 +/- 0.10 These observations indicate that SN2009ip is
currently dimming and reddening at a rate that is inconsistent with a
true supernova. Additional observations to follow the decline are
encouraged.
udv:
Fidusz
>
> --------------------------------------------------------------------------------
>
> The Astronomer´s Telegram
http://www.astronomerstelegram.org
>
> ==============================================================================
> ATEL #4412 ATEL #4412
>
> Title: SN 2009ip: an LBV becomes a real supernova
> Author: Nathan Smith, Jon Mauerhan (U. Arizona)
> Queries: nathans@as.arizona.edu
> Posted: 22 Sep 2012; 03:43 UT
> Subjects:Optical, Star, Supernovae, Transient, Variables
>
>
> SN 2009ip was a transient source that was attributed to the eruption of
> a massive LBV star. Pre-discovery images with HST showed a massive blue
> progenitor star with a ZAMS mass of about 60 M_sun or more (Smith et al.
> 2010; Foley et al. 2011) as well as pre-outburst variability consistent
> with a massive eruptive LBV (Smith et al. 2010), culminating in an eruption
> with a peak absolute magnitude of -14.5 mag (Smith et al. 2010). It then
> had a second LBV-like outburst in July 2010 with a peak absolute magnitude
> of about -14 (Drake et al. 2010; ATel 2897).
>
> Drake et al. (2012; ATel #4334) then reported a third brightening of the
> object on 2012 July 24, which reached an absolute magnitude brighter than
> -14.5 by August 2012. Foley et al. (2012; ATel #4338) reported that a
> high-resolution spectrum of SN2009ip in this most recent outburst obtained
> on 2012 August 26 showed bright Balmer lines with Lorentzian profiles that
> have FWHM of 640 km/s. This is similar to the spectra of its previous 2009
> outburst (Smith et al. 2010; Foley et al. 2011).
>
> We obtained low and moderate-resolution spectra using the Steward Observatory
> B&C spectrograph on the Bok 90" telescope on Kitt Peak on 2012 September
> 15 and 16, which reveal important changes in the spectrum. In addition
> to the narrow lines reported previously, the new spectra also show very
> broad lines typical of a normal Type II supernova. H Balmer lines have
> strong P Cygni profiles, with a minimum in the absorption at -6000 km/s,
> and a blue edge to the absorption at -13,000 km/s. Although calibrated
> photometry was not obtained, the object in the guider camera (red sensitive)
> appeared brighter than at any previous time compared to nearby field stars.
> It seems probable that the object discovered as SN 2009ip has suffered
> multiple LBV eruptions, but has now exploded as a genuine core-collapse
> supernova of Type IIn.
>
> We encourage immediate intense followup observations at all wavelengths.
>
> ------------------------------------------------------------------------------
> Password Certification: Nathan Smith (nathans@as.arizona.edu)
>
http://www.astronomerstelegram.org/?read=4412
> ==============================================================================
--
Fidusz (FIDRICH Robert)
MTVSZ/FoE Hungary
http://www.mtvsz.hu
drotlevel:fidusz@zpok.hu
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