[vsnet-chat 4553] re Nova Sco 2001

[crawl@zoom.co.uk]

Arne Henden wrote:

>Yamaoka-san reported a faint star near the proper
>position with Bmag=20, Rmag=17.5; Liller's spectroscopy
>indicates reddening.  This would imply that the progenitor
>would be pretty bright in the infrared.  Yet Taichi
>has searched 2MASS and finds no corresponding IR source.
>This doesn't make immediate sense.

There is a 2MASS star at exactly 4.0 arcsecs _due west_ [ie 0 arcsecs
north/south] of the position given for the nova.  Though 2MASS stuff is
_usually_ good to the arcsec or so.

The 2MASS object has mags H and Ks both around 13 and a half

Images of the 2MASS field can be compared to the nova image via the IRSA
image server at http://irsa.ipac.caltech.edu/

Having said that, and taking my own advice, there is an faint object at
exactly the nova's co-ordinates in the 2MASS visual archive, which is not
the same as the 2MASS object mentioned above.  There is no 2MASS
information given for that star, which looks a couple of mags fainter than
the one mentioned above and which has roughly similar brightness in each of
the J, H and Ks images.

Cheers

John

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