Hello,
128 spectra of V442 And (hd6226) have been collected since the outburst discovery on the night of augst 21st [still waiting for more observers to join in...

], for a total exposure time of 135 hours:

- V442And Observers.JPG (26.14 KiB) Viewed 6871 times
I have a mea culpa to make - I did a mistake in the V & R calculation. Basically, I wanted to remove 0.9 on each measurements in order to compensate for the absorption line (until I find a way to model it); well I added the 0.9 instead. Here are the corrected data. They show very similar information, but more accurately!

The emission increased but is now in the decline as the V+R graph shows:

- V442And V-plus-R evolution aug21-sep27.png (14.79 KiB) Viewed 6871 times
The V/R is still showing variability. I grouped in blue the variable phases, in green the more stable ones:

- V442And V_R evolution aug21-sep27.png (23.72 KiB) Viewed 6871 times
A period analysis shows a period of 2.6852 days:

- V442And V_R phased evolution aug21-sep27.png (31.69 KiB) Viewed 6871 times
This is very close to the period found on HeI 6678 stellar photospheric line, ie the star rotation itself:

- V442And HeI6678 phased evolution aug21-sep27.png (23.96 KiB) Viewed 6871 times
The Halpha daily graph shows the evolution over time:

- V442And daily Halpha evolution aug21-sep27.JPG (185.52 KiB) Viewed 6871 times
The Hbeta emission is now almost gone:

- V442And daily Hbeta evolution aug21-sep27.JPG (169.63 KiB) Viewed 6871 times
More study should come out of those observations. This is clearly an excellent opportunity to study such small ejecta outburst. The emission should last for several weeks (couple of months?) so
please keep observing. A SNR of 100 is prefered if you can. Of course, spectra should be uploaded in BeSS for archive and future study. Please send a copy to me (
thizy@free.fr) so I can add it in this analysis.
Cordialement,
Olivier