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Spectroscopic and Photometric Analysis of the O-Type Binary V1182 Aquilae: A Close Eclipsing System with a Luminous Third Body
We obtained high-resolution spectroscopy and UBV photometry of theO-type eclipsing binary V1182 Aql. In the spectra lines of a thirdcomponent were found; the presence of third light is also supported bythe solution of the light curves. New masses for both components of thebinary were derived: M1=31.0 and M2=16.6Msolar. These values differ considerably from those given byBell et al., which were obtained by neglecting the presence of a thirdbody. With Teff~43,000 K the primary component is much hotterthan expected for the previously assumed spectral type O8. Itsclassification has to be revised to O5.5, which makes V1182 Aql probablythe earliest eclipsing binary in the Galaxy. The mass of the primary issmaller than suggested by evolutionary models, while the secondaryparameters agree with a position close to the zero-age main sequence(ZAMS). The third body, which manifests itself by strong lines in theoptical spectrum and by a third light contribution of ~17% as deducedfrom the light curve solution might be detectable by interferometricmeasurements.Based on observations collected at the European Southern Observatory, LaSilla, Chile, and at the German-Spanish Astronomical Centre, Calar Alto,operated by the Max-Planck-Institut für Astronomie, Heidelberg,jointly with the Spanish National Commission for Astronomy; also basedon spectral data retrieved from the ELODIE archive at Observatoire deHaute Provence (OHP).
| Stellar spectrophotometric standards. II
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| A photometric and spectroscopic study of the early-type binary V1182 Aquilae
New Stromgren photometry and medium-dispersion spectroscopy of theearly-type binary V1182 Aql are presented. The masses and radii of thetwo components are found to be (37.8 + or - 1.6) and (13.5 + or - 0.5)solar masses and (8.8 + or - 0.2) and (5.9 + or - 0.1) solar radii,respectively. A lower limit to the primary temperature has beenestablished, and interpretation of the evolutionary status of the systemis closely linked to the adopted primary temperature.
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Observation and Astrometry data
| Constellation: | Aquila |
| Right ascension: | 18h54m55.13s |
| Declination: | +09°14'05.1" |
| Apparent magnitude: | 8.118 |
| Proper motion RA: | 44.6 |
| Proper motion Dec: | -8.6 |
| B-T magnitude: | 8.437 |
| V-T magnitude: | 8.145 |
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