Nova Sgr 2014 - spectroscopy?

[Rob_K]

I'm sure I remember Malc or Jon or somebody posting a heads-up about this nova but I can't seem to find it. Anyway, it seems to be the 'forgotten nova' with all the fuss about V745 Sco and the on-going work on V1369 Cen!

It took two weeks but a spectrum was finally obtained to confirm this object's type (CBET 3082: PNV J18250860-2236024 = Nova Sagittarii 2014). From discovery mag of 8.7 U the brightness quickly dropped to about V=11.5 but over the last week it has significantly brightened, last reported about V=10. AAVSO light curve attached.

It should be quite a viable target for spectroscopy over the next night or maybe two, until the Moon interferes. Unfortunately it's way beyond my equipment. :sadeyes:

Also attached is an image I took of the nova on 04 Feb. In addition, here's a link to an animation using the 4 Feb shot and an earlier image of the field - the nova is just left of centre:
http://i727.photobucket.com/albums/ww271/Rob_Kau/PNVJ18250860-223602417Oct2013amp04Feb2014animati on.gif

Cheers -

[Jon]

Finally clear skies. I got photometry of this last night; I'll go for a spectrum tonight given that it's a weekend and another 4am job ...

[malclocke]

Good luck Jonathan ;) Spectra are very thin on the ground for this one.

[Jon]

Ah, Malc, you make me feel guilty. I had it in the FOV this morning at 4.20 doing photometry. It's nice and bright. I had got up at 3.30 for V745 Sco and V1369 Cen. I thought "do I whack on the SA100, refocus, rotate the camera to give a horizontal spectrum"? about 20 mins work done properly.

But I went to bed and took a time series B and V instead.

According to UPS parcel tracking my I and R filters have arrived in Hawaii on their way from Astrodon in Kentucky to Canberra. My L200 is fully paid-up and might just arrive in time for Nova Cen. I'm broke, but happy :-)

[Jon]

Clouds for the last two nights. I shouldn't have got so cocky ..

[Jon]

Finally nabbed it.

Very similar to Nova Cen - a classic Fe nova. In fact I've also included a comparison image with V1369 Cen on 19 Jan, a comparable time after maximum. In Nova Sgr 2014 the [OI] lines at 5577 and 6300 have developed a little quicker; and for some reason the H emission gamma line is missing altogether in Nova Sgr. But otherwise the spectra are pretty much identical in terms of composition.

Cheers

Jonathan

[Glenpiper]

Hi guys,

I'm new to this V1369 Cen discussion because, until last night, this nova hadn't risen above my urban obstacles to be seen by me at a convenient time.

I've only covered a 150A range (4595-4745A) at R=8700 (SNR~100), using a Lhires III with 2400 grating on a 0.28m scope, as that is where I'm working at for two other long running pro-am projects.

Given that one seldom sees 'high' res nova spectra in this HeII area it may be of interest to researchers and it is interesting to note the triangular profile ... which tends to question statements that this is a classic FeII nova. It is impossible to say if any NeIII or HeII is hidden in this zone but it is most likely that many of the FeII 37 and 38 multiplets are present ... which leads me to suggest this may be a hybrid (FeII b) nova. I've not followed the discussions of this nova here, or on other forums, so this topic may already have been well covered. Unless there are requests for further coverage of this wavelength (unlikely) this is probably my first and last spectra of this nova .. unless I add it to my echelle target list.

Cheers,

[Jon]

Hi Bernard,

That's n interesting He line.

I suspect you meant to list in in the other, very long thread here on V1369 Cen. Thus thread (and my comment about a "standard" FeII nova) is about Nova Sgr 2013.

In truth both novae are unusual beasts.

[Glenpiper]

Hi Jon,

You are obviously right ... silly me ... so thanks for pointing that out and I have now reposted it, hopefully correctly, to the right list.

[Rob_K]

Nice work Jon, glad you got it! :thumbsup:

Cheers -

[Jon]

Have a look at the light curve on AAVSO. It's as nuts as Nova Cen. Possibly heading up to a third maximum in three weeks.

[Jon]

This nova remains bright and the light curve (attached) is unusual for its recurrent rebrightenings. At Mag 10 it is well within the range of low-resolution spectroscopes. Might I suggest it's well worth a look? So far I've only seen my SA100 spectrum of a month ago.
I guess we assumed it would have faded too much by now, but far from it. If anything the curve is more interesting than V1369 Cen.

[Jon]

Here's another spectrum of this forgotten little gem.

Two months on it hasn't appreciably faded. Just oscillating.

[Merlin66]

Rob,
Well done!
I'm glad someone is keeping an eye on it...
Now the requirement for V1369 Cen is on "every five days" I'll add this one to my "planning" list.....