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The 2006 hot phase of Romano’s star (GR 290) in M 33

Viotti, R.F. and Galleti, S. and Gualandi, R. and Montagni, F. and Polcaro, V.F. and Rossi, C. and Norci, Laura (2007) The 2006 hot phase of Romano’s star (GR 290) in M 33. Astronomy & Astrophysics, 464 (3). ISSN 0004-6361

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Abstract

Understanding the nature of the instabilities of LBVs is important to understand the late evolutionary stages of very massive stars. We investigate the long term, S Dor-type variability of the luminous blue variable GR290 (Romano’s star) in M33, and its 2006 minimum phase. New spectroscopic and photometric data taken in November and December 2006 were employed in conjunction with already published data on GR290 to derive the physical structure of GR290 in different phases and the time scale of the variability. We find that by the end of 2006, GR 290 had reached the deepest visual minimum so far recorded. Its present spectrum resembles closely that of the Of/WN9 stars, and is the hottest so far recorded in this star (and in any LBV as well), while its visual brightness decreased by about 1.4 mag. This first spectroscopic record of GR290 during a minimum phase confirms that, similarly to AG Car and other LBVs, the star is subject to ample S Dor-type variations, being hotter at minimum, suggesting that the variations take place at constant bolometric luminosity.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:stars: evolution; stars: variable; stars: individual: GR 290; stars: hypergiant; galaxies: individual: M 33;
Subjects:Physical Sciences > Astronomy > Astrophysics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:EDP Sciences
Official URL:http://dx.doi.org/10.1051/0004-6361:20067001
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:107
Deposited On:21 Nov 2007 by DORAS Administrator. Last Modified 30 Jan 2009 15:46

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