Sziasztok!

Bar ez meg mult heti hir, de nem biztos, hogy mindenki olvasta:

http://www.astronomerstelegram.org/?read=3599

Near Infrared Spectrum of SN Ia 2011fe Resembles Fast Decliners Observed
A Week Before Maximum

ATel #3599; Harvard, CfA
on 27 Aug 2011; 00:03 UT
Credential Certification: Howie Marion (gmarion@cfa.harvard.edu)

Subjects: Infra-Red, Supernovae

Referred to by ATel #: 3605

We observed SN 2011fe with the IRTF 3.0m and the SpeX instrument on
August 26.3. The spectrum reveals strong absorption features from MgII
at 13500 km/s. The CaII infrared triplet forms a strong and broad
feature with a minimum at about 22000 km/s. SiII and OI are also
detected at about 12500 km/s. The presence of evolved MgII features in
this NIR spectrum is suggestive of a phase no more than one week before
maximum light. This estimate is different than about two weeks
pre-maximum which would be inferred for this observation date from ATEL
3581. The strong MgII features are also indicative of SN Ia with fast
decline rates: delta_m15 > 1.3. If SN 2011fe has a fast rise and fast
decline, these observations will be closer to the maximum which is
consistent with both aspects of the NIR spectrum. We thank John Rayner
for making IRTF time available and Eric Volquardsen for help with the
observations.

* * *

Vagyis a szinkepi jellemzok alapjan azt allitja Marion, hogy az SN2011fe
a gyorsan fenyesedo es gyorsan halvanyodo SN Ia tipusu szupernovak koze
tartozik.

Eszleljuk, amig latszik! (Allitolag, kedd ota tovabb fenyesedett, es mar
10.5 magnitudo koruli volt a legutobbi eszlelesek szerint -- ebben az
esetben nem csodalkozom, hogy binoklival is lattatok.)

udv:

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Fidusz (FIDRICH Robert)
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