Spectral Evolution of the Luminous Blue Variable NGC 2363-V1. I. Observations and Qualitative Analysis of the Ongoing Giant Eruption

Details Spectral Evolution of the Luminous Blue Variable NGC 2363-V1. I. Observations and Qualitative Analysis of the Ongoing Giant Eruption Spectral Evolution of the Luminous Blue Variable NGC 2363-V1. I. Observations and Qualitative Analysis of the Ongoing Giant Eruption

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....132.1756p&link_type=abstract

The Astronomical Journal, Volume 132, Issue 5, pp. 1756-1762.

Astronomy and Astrophysics

Astronomy

11

Stars: Atmospheres, Stars: Emission-Line, Be, Stars: Evolution, Stars: Individual (Ngc 2363-V1), Stars: Winds, Outflows

Scientific paper

We describe the spectroscopic evolution of the extragalactic luminous blue variable NGC 2363-V1 from 1997 to 2004. Photometrically, this star has gradually faded by 0.3 mag in the V band over this period, while spectra obtained with the Hubble Space Telescope show dramatic changes: a gradual strengthening of the UV flux (a fourfold increase at 120 nm) is accompanied by a weakening of all Balmer lines (a factor of 3 at Hα), the disappearance of the absorption component of the P Cygni profile at Hα, the appearance and strengthening of He I lines in emission, and a shift of the main source of UV line-blanketing from Fe II to Fe IV. These long-term changes show that the star's effective temperature has been constantly rising between 1997 and 2004, while its mass-loss rate has significantly decreased. We also note a possible increase in the bolometric luminosity of V1 during this period.

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