[vsnet-chat 902] Re: NGC4462 sequence

[aah@nofs.navy.mil]

Taichi Kato asked:
>   Thank you veru much!  I have tried your anonymous ftp file several times
>without success.  Is this B-V=+0.27 color usual for an SN Ia at maximum?
  I'm not a supernovae expert by any means.  They redden as they age.
The aperture differential results for the three nights I took data are:

 HJD          V     B-V    V-R     R-I
50935.7229  13.496  0.268  0.175  -0.135
50936.7160  13.498  0.276  0.189  -0.197
50937.6754  13.532  0.313  0.178  -0.220
50937.6814  13.535  0.307  0.177  -0.235

which show that the supernovae is in decline, and is reddening slowly.
(V-R) is unchanged, and (R-I) is showing definite changes...perhaps there
is an emission line that is getting stronger?  Caveat: these aperture
magnitudes do not have the underlying galaxy subtracted.
  Someone who does know SNe ought to comment.  I have enough trouble
trying to understand Cepheids!

Arne

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