Hodge 53-47: an early O-type double-lined binary in the Small Magellanic Cloud★
Corresponding Author
Nidia Morrell
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Based on observations collected at the Comlejo Astronómico El Leoncito (CASLEO), San Juan, operated under agreement between CONICETand the National Universities of Córdoba, La Plata and San Juan Argentina.
E-mail: [email protected]
Member of Carrera del Investigador Científico, CONICET, Argentina.
Visiting Scientist, Las Campanas Observatory, Carnegie Institution of Washington.
Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. for NSF.
Fellow of CONICET, Argentina.
Search for more papers by this authorPablo Ostrov
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Search for more papers by this authorCorresponding Author
Philip Massey
Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001, USA
Based on observations collected at the Comlejo Astronómico El Leoncito (CASLEO), San Juan, operated under agreement between CONICETand the National Universities of Córdoba, La Plata and San Juan Argentina.
E-mail: [email protected]
Member of Carrera del Investigador Científico, CONICET, Argentina.
Visiting Scientist, Las Campanas Observatory, Carnegie Institution of Washington.
Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. for NSF.
Fellow of CONICET, Argentina.
Search for more papers by this authorCorresponding Author
Roberto Gamen
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Based on observations collected at the Comlejo Astronómico El Leoncito (CASLEO), San Juan, operated under agreement between CONICETand the National Universities of Córdoba, La Plata and San Juan Argentina.
E-mail: [email protected]
Member of Carrera del Investigador Científico, CONICET, Argentina.
Visiting Scientist, Las Campanas Observatory, Carnegie Institution of Washington.
Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. for NSF.
Fellow of CONICET, Argentina.
Search for more papers by this authorCorresponding Author
Nidia Morrell
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Based on observations collected at the Comlejo Astronómico El Leoncito (CASLEO), San Juan, operated under agreement between CONICETand the National Universities of Córdoba, La Plata and San Juan Argentina.
E-mail: [email protected]
Member of Carrera del Investigador Científico, CONICET, Argentina.
Visiting Scientist, Las Campanas Observatory, Carnegie Institution of Washington.
Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. for NSF.
Fellow of CONICET, Argentina.
Search for more papers by this authorPablo Ostrov
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Search for more papers by this authorCorresponding Author
Philip Massey
Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001, USA
Based on observations collected at the Comlejo Astronómico El Leoncito (CASLEO), San Juan, operated under agreement between CONICETand the National Universities of Córdoba, La Plata and San Juan Argentina.
E-mail: [email protected]
Member of Carrera del Investigador Científico, CONICET, Argentina.
Visiting Scientist, Las Campanas Observatory, Carnegie Institution of Washington.
Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. for NSF.
Fellow of CONICET, Argentina.
Search for more papers by this authorCorresponding Author
Roberto Gamen
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Based on observations collected at the Comlejo Astronómico El Leoncito (CASLEO), San Juan, operated under agreement between CONICETand the National Universities of Córdoba, La Plata and San Juan Argentina.
E-mail: [email protected]
Member of Carrera del Investigador Científico, CONICET, Argentina.
Visiting Scientist, Las Campanas Observatory, Carnegie Institution of Washington.
Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. for NSF.
Fellow of CONICET, Argentina.
Search for more papers by this authorABSTRACT
We present a spectroscopic and photometric study of the double-lined binary Hodge 53-47 in the Small Magellanic Cloud. We determine for the binary components spectral types of O6 V + O4-5 III(f). Through a simultaneous light and radial velocity curve analysis via the Wilson–Devinney code we find absolute masses of ∼26 M⊙ and ∼16 M⊙ and radii of ∼10.1 R⊙ and ∼8.4 R⊙ for the O6 V and O4-5 III(f) components, respectively. The relatively low mass found for the O4-5 III(f) component suggests that mass transfer and loss have played a significant role in the evolution of these stars.
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