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[vsnet-chat 5578] H Alpha Photometry of Novae

The table below gives Hydrogen Alpha (H alp) photometry of three novae.  The  magnitudes indicate strong H Alpha emission for the two recent novae V4742 Sgr and V4743 Sgr.  The old nova (eruption in 1918) V603 Aql  is only indicating weak H alpha emission.  All three measurements are what would be expected for novae in their stages of life.  The equipment used was a 0.2 m SCT , SBIG ST-9E CCD, Rc filter, and a 95 Angstrom half width H alpha filter.  The instrumental photometric system is transformed to the standard system using the standard stars found in: Strauss, F.M., and Ducati, J.R., "Standard Stars for H alp Photometry", astron. Astrophys. Suppl. Ser. 44, (1981) 337-343.

Nova               UT Date - Time          H alp mag
V4743 Sgr 10/12/2002  01:24       0.056
V603 Aql 10/15/2002  02:02       1.802
V4742 Sgr 10/17/2002  01:20       0.364


The standard error for each observation is 0.019 magnitude.  A normal star, that is, a star that isn't a nova or an emission line star, typically has H alp = 2.0 +/- 0.1.  Calibration details can be found at:
http://members.aol.com/dwest61506/page34.html

Regards,
Doug West
http://hometown.aol.com/dwest61506/index.html

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