Nightly monitoring requested for V1280 Sco = N Sco 2007

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Nightly monitoring requested for V1280 Sco = N Sco 2007

文章 PTS » 週六 12 5月, 2018 06:26

AAVSO Alert Notice 634
Nightly monitoring requested for V1280 Sco = N Sco 2007
May 11, 2018 : Dr. Frederick Walter (Stony Brook University) has requested AAVSO assistance in monitoring V1280 Sco (Nova Sco 2007).

After it appeared as a nova in February 2007 (AAVSO Alert Notice 346), V1280 Sco reached visual magnitude ~3.8 (several observers), then faded to about 13.2, brightened to about 12.7, and underwent a dust dip in June 2007 to <15.6 V (P. Nelson). It recovered to about 10.3 by about a year later.

Dr. Walter writes: "It has been hanging in at V~10.3 for the past 8 years, after recovering from a dust dip. Recently, it dipped by over a magnitude in the optical bands, and has been slowly recovering. It did something similar about 200 days ago, after doing basically nothing for years. [His expanded light curve of the recent dip is below. His full light curve is here.]



"Questions abound about V1280 Sco. Why is it still bright (it has no obvious pre-outburst counterpart)? When will it finally fade? My best guess is that this nova occurred on a low mass white dwarf, so the ejected envelope is rather massive. The ejection velocities are slow (but there is, even now, a prominent outflow in He I), and the emission lines are cool (mostly Fe II) and narrow.

"It doesn't look like a normal nova now, but it reached third magnitude in 2007 and had a prominent dust dip. It just remains optically thick."

Observers are requested to obtain nightly observations, ideally, filtered (V or B would be best), of V1280 Sco until further notice. Dr. Walter says that "a nightly cadence is needed to get a timescale for the entrance into the dip. While it is possible that nothing will happen for the rest of this observing season, good quality high cadence observations may reveal some underlying periodicities." Visual observations are also welcome.


The AAVSO light curve of V1280 Sco since its discovery in 2007.

Coordinates (2000.0): R.A. 16 57 41.22 Decl. -32 20 35.6

Charts: Charts with a comparison star sequence for V1280 Sco may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name V1280 SCO.

This campaign is being followed in the AAVSO Campaigns and Observing Reports Forum at
https://v1280-sco-nova-sco-2007-campaign

and in the AAVSO Novae Forum at
https://v1280-sco-nova-sco-2007-campaign-01

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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