The LBV nature of Romano's star (GR 290) in M 33

Details The LBV nature of Romano's star (GR 290) in M 33 The LBV nature of Romano's star (GR 290) in M 33

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...411..193p&link_type=abstract

Astronomy and Astrophysics, v.411, p.193-196 (2003)

Astronomy and Astrophysics

Astrophysics

13

Stars: Evolution, Stars: Emission-Lines, Be, Stars: Individual: Gr 290, Stars: Mass-Loss, Galaxies: Individual: M 33

Scientific paper

We report the first spectroscopic study of the LBV candidate GR 290 in M 33 (``Romano's star'') taken in February 2003, showing, besides prominent hydrogen and He I emission lines, the 4630-60 Å blend and weak He II 4686 Å emission typical of Of stars. Our broad-band photometry shows that the star was observed during a phase of minimum optical luminosity, with B=17.91+/- 0.03, and a slightly positive colour index, which we tentatively attribute to an anomalous continuum energy distribution. We argue that GR 290 is indeed an LBV star presently in a high temperature phase, that should be followed - also in a short time - by ample spectroscopic and associated photometric variations.
Based on observations collected at 1.52 m Cassini telescope of the Loiano Observing Station, Bologna Astronomical Observatory.

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