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Spectroscopic confirmation of recent M31 novae

ATel #3649; Y. Cao, M. M. Kasliwal, K. Mooley (Caltech), I. Arcavi, D. Polishook (Weizmann) on behalf of the Palomar Transient Factory collaboration
on 16 Sep 2011; 22:15 UT
Credential Certification: Mansi Manoj Kasliwal (mansi@astro.caltech.edu)

Subjects: Optical, Cataclysmic Variable, Nova, Transient

We report spectroscopic confirmation of M31N 2011-07a, M31N 2011-07b, M31N 2011-08a, M31N 2011-08b. The spectra were acquired with the Double Spectrograph mounted on the 200-inch Hale telescope at Palomar Observatory.

The spectrum of M31N 2011-07a (internally designated as PTF11kie) was obtained on Sept 03.461. The spectrum has a weak continuum and prominent line emissions --- Balmer series, C II 4267, Ne III 4640, He II 4686, Ne I 5686, N II 5679, C II 7234, O I 8446 and N I 9396. The H-alpha line has a FWHM of ~1,700 km/s. We conclude that M31N 2011-07a is a He/N class classical nova in M31.

The spectrum of M31N 2011-07b (internally designated as PTF11kif) was obtained on Sept 03.448. Though the spectrum is relatively noisy, we can clearly identify emission lines, such as H-alpha, [O I 6300] as well as Fe II lines. H-alpha has a narrow FWHM of ~400 km/s. H-beta shows a P-cygni profile. This spectrum shows that M31N 2011-07b is an Fe-class classical nova in M31.

The spectrum of M31N 2011-08a (internally designated as PTF11jza) was obtained on Sept 03.436. While the continuum component is very weak, the spectrum shows strong line emissions, such as Balmer lines, O I 7773, O I 8446 and Fe II lines. The FWHM of H-alpha is ~1500 km/s. This spectrum illustrates M31N 2011-08a is an Fe-class classical nova in M31.

The spectrum of M31N 2011-08b (internally designated as PTF11kfb) was obtained on Sept 03.473. We observed a very weak continuum and prominent emission lines such as the Balmer series, O I 8446 and 7773 lines, N III 4640 lines and Fe II lines. The H-alpha line has a FWHM of ~1700 km/s. This spectrum shows that M31N 2011-08b is an Fe-class classical nova in M31.