The spectrum of the recurrent nova U Scorpii during the 1999 outburst

Details The spectrum of the recurrent nova U Scorpii during the 1999 outburst The spectrum of the recurrent nova U Scorpii during the 1999 outburst

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...387.1013i&link_type=abstract

Astronomy and Astrophysics, v.387, p.1013-1021 (2002)

Astronomy and Astrophysics

Astrophysics

26

Stars: Individual: U Sco, Novae, Cataclysmic Variables

Scientific paper

An optical spectrum covering the range łł4300-6900 Å, of the recurrent nova U Sco in outburst was taken on February 26th 1999, only 16 hours after maximum. Broad emission lines of H I, He I, N II, N III were seen on the spectrum, while the emission line of He II ł4686 was not yet seen. The FWHM of the emission component of Hα was 8000 km s-1, and the FWZI was roughly 12000 km s-1. The emission line of Hα had blue (-3250 km s-1), central (+30 km s-1), and red (+2770 km s-1) peaks, among which the red one was the most prominent. A narrow absorption component of Hα blue-shifted by -4850 km s-1, was seen. The other prominent lines had a main emission peak red-shifted by 2000- 3000 km s-1, and a weak secondary peak blue-shifted by -2000- -3000 km s-1. Most of He I and N II lines were flanked by a narrow absorption component blue-shifted by about -4300 km s-1, which was a good clue for the detailed identification of these lines. These absorption components and some emission lines of N II faded very rapidly and nearly disappeared one day after our observation. The widths of the emission lines decreased with time. The radial velocities of three emission peaks of Hα were -1560 km s-1, +60 km s-1, and +1800 km s-1 on March 14th, 17 days after maximum, when the blue one became stronger than the others. The helium abundance by the number of atom of the ejecta is estimated as N(He)/N(H) = 0.16+/- 0.02 which is much lower than those found in previous works, and is not different from those of normal classical novae. Adopting the distance 6 kpc, the mass of the ejecta is estimated as 3- 9x 10-7 Msun.

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