INVESTIGADORES
SAFFE Carlos
artículos
Título:
New objects with the B[e] phenomenon in the Large Magellanic Cloud
Autor/es:
LEVATO, HUGO; MIROSHNICHENKO, ANATOLY; SAFFE, CARLOS
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2014 vol. 568 p. 1 - 8
ISSN:
0004-6361
Resumen:
Aims. The study is aimed at discovering new objects with the B[e] phenomenon in the Large Magellanic Cloud. Methods. We report medium-resolution optical spectroscopic observations of two newly found (ARDB 54 and NOMAD 0181-0125572) and two previously known (Hen S-59 and Hen S-137) supergiants with the B[e] phenomenon in the Large Magellanic Cloud. The observations were obtained with the GMOS spectrograph at the southern Gemini telescope. Results. Optical spectra of ARDB 54 and NOMAD 0181-0125572 are presented for the first time as well as their fundamental parameters. We found that the Balmer line profiles of Hen S-59 and Hen S-137 were different from those observed in their spectra nearly 20 years ago. We suggest a higher effective temperature and luminosity for both objects. With the new fundamental parameters, the lowest luminosity for known supergiants with the B[e] phenomenon in the Magellanic Clouds is higher that previously thought (log L/Lo = 4.5 instead of 4.0). Hen S-59 may be a binary system based on its UV excess, variable B - V colour-index and radial velocity of emission lines, and periodically variable I-band brightness.