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Optical Spectroscopy of X-Mega Targets : I. CPD -59:2635: A New Double-Lined O-Type Binary in the Carina Nebula

Albacete Colombo, Juan Facundo et al · SEDICI UNLP · 2001

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Author / responsible party
Albacete Colombo, Juan Facundo et al
Publisher
SEDICI UNLP
Year
2001
Language
English

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Optical spectroscopy of CPD-59° 2635, one of the O-type stars in the open cluster Trumpler 16 in the Carina Nebula, reveals this star to be a double-lined binary system. We have obtained the first radial velocity orbit for this system, consisting of a circular solution with a period of 2.2999 d and semi-amplitudes of 208 and 273 km s−1. This results in minimum masses of 15 and 11 M? for the binary components of CPD-59° 2635, which we classified as O8V and O9.5V, although spectral type variations of the order of 1 subclass, which we identify as the Struve–Sahade effect, seem to be present in both components. From ROSAT HRI observations of CPD −59° 2635 we determine a luminosity ratio log(Lx/Lbol)≈−7, which is similar to that observed for other O-type stars in the Carina Nebula region. No evidence of light variations is present in the available optical or X-ray data sets. Facultad de Ciencias Astronómicas y Geofísicas

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APA 7

Albacete Colombo, J. F. E. A. (2001). Optical Spectroscopy of X-Mega Targets: I. CPD -59:2635: A New Double-Lined O-Type Binary in the Carina Nebula. http://sedici.unlp.edu.ar/handle/10915/2071

MLA

Albacete Colombo, Juan Facundo et al. "Optical Spectroscopy of X-Mega Targets: I. CPD -59:2635: A New Double-Lined O-Type Binary in the Carina Nebula." 2001. http://sedici.unlp.edu.ar/handle/10915/2071.

Chicago

Albacete Colombo, Juan Facundo et al. 2001. "Optical Spectroscopy of X-Mega Targets: I. CPD -59:2635: A New Double-Lined O-Type Binary in the Carina Nebula.". http://sedici.unlp.edu.ar/handle/10915/2071.

Harvard

Albacete Colombo, J. F. E. A. 2001, Optical Spectroscopy of X-Mega Targets: I. CPD -59:2635: A New Double-Lined O-Type Binary in the Carina Nebula, SEDICI UNLP, available at: http://sedici.unlp.edu.ar/handle/10915/2071 [Accessed 8 Aug. 2026].

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Title
Optical Spectroscopy of X-Mega Targets : I. CPD -59:2635: A New Double-Lined O-Type Binary in the Carina Nebula
Author / contributors
Albacete Colombo, Juan Facundo et al
Publisher
SEDICI UNLP
Publication year
2001
Language
English

Subjects

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Ciencias Astronómicas; astrofísica; binaries: general; stars: early-type; stars: individual: CPD 2598 2635; open clusters and associations: individual: Trumpler 16; X-rays: stars
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